Κατηγορίες Προϊόντων

Every letter / symbolization depends on its location within the product type description for its explanation. The following list is divided in logical groups for easier reading (at the end an example to know where to look for).

1. Types of Application

special cables glossary for data cables image 1

2. Conductor Insulation

special cables glossary for data cables image 2

3. Seath: Filler, Screens, Innner Seaths

special cables glossary for data cables image 3

4. Outer Seath

special cables glossary for data cables image 4

5. Over Seath

special cables glossary for data cables image 5

6. Stranding Elements

special cables glossary for data cables image 6

{tab 7. Other}

special cables glossary for data cables image 7

Every letter / symbolization depends on its location within the product type description for its explanation. The following list is divided in logical groups for easier reading (at the end an example to know where to look for)



Special Cable Glossary For Power Cables 1

Conductor Insulation

Special Cable Glossary For Power Cables 2

Support Element, Screenings

Special Cable Glossary For Power Cables 3

Outer Seath

Special Cable Glossary For Power Cables 4


Special Cable Glossary For Power Cables 5


Acronyms / Abbreviations Short Explanation
11Y PUR (Polyurethane)
12Y mod. TPE
2G (Bi) Silicone
2Y PE (Polyethylene)
5-Mil Copper Solid Copper Shield. Provides added electrical protection.
802.14 IEEE's Cable TV MAC and PHY Protocol Working Group.


A a symbol designation for ampere.
A nationally recognized type
A single core
A/D Analogue-to-Digital
ABR Available Bit Rate.
Abrasion Resistance Ability of a wire, cable or material to resist surface wear.
Abrasion Stripper More accurately described as "buffing stripper", which is a motorized device for removing flat cable insulation by means of one or two buffing wheels that melt the insulation and brush it away from the conductors.
ac Alternating current
AC Armored Cable, NEC Article 333 Cable Designation
AC0 Analog Central Office
Accelerated Aging A test that simulates long time environmental conditions in a relatively short time.
Ace Wire and Cable Co., Inc. Master stocking distributor of wire, cable and connectivity products for
ACF Actual cubic feet
ACR The difference between attenuation and crosstalk, measured in dB, at a given frequency (acronym for Attenuation Crosstalk Ratio). Important characteristic in networking transmission to assure that signal sent down a twisted pair is stronger at the receiving end of the cable than are any interference signals imposed on that same pair by crosstalk from other pairs.
A-D Analog to digital conversion
ADO Auxiliary Disconnect Outlet
ADSL Asymmetric Digital Subscriber Line
AER Aerial
AF Audio frequency
AIA American Institute of Architects
Air Core Cables that are not gel filled.
Air-Gap Dielectric A coaxial design in which a monofilament of plastic holds the center conductor in place allowing the remainder of the dielectric to be air. Typical velocities of up to 84% can be achieved in this design.
Alloy A combination of two or more different polymers/metals. Usually combined to make use of different properties of each polymer metal.
ALPETH Coated Aluminum Polyethylene. Basic sheath. An aerial telephone cable having an aluminum shield and polyethylene jacket
ALS A type of cable consisting of insulated conductors enclosed in a continuous, closely fitting aluminum tube
Alternating Current (AC) Electric Current that alternates or reverses polarity continuously. The number of alternations per second are described as cycles, (hertz or Hz).
ALVYN An indoor, riser rated telephone cable having an aluminum shield and vinyl jacket (PVC)
AM Amplitude Modulation
Ambient Conditions existing at a test or operating location prior to energizing equipment (e.g.
American Wire Gauge (AWG) A standard for expressing wire diameter. As the AWG number gets smaller, the wire diameter gets larger.
Ampacity Current handling capability. The maximum current a conductor can carry without being heated beyond a safe limit.
Ampere A standard unit of current. Defined as the amount of current that flows when one volt of emf is applied across one ohm of resistance. An ampere of current is produced by one coulomb of charge passing a point in one second.
Amplitude The Maximum value of a varying wave form.
AMS Aerospace Material Specification
AMS 2750 Pyrometry
Analog Representation of data by continuously variable quantities.
Analog Signal An electrical signal which varies continuously, not having discrete values. Analog signals are copies or representations of other waves in nature. An analog audio signal, for instance, is a representation of the pressure waves which make up audible sound.
Anneal To soften and relieve strains in any solid material, such as metal or glass, by heating to just below its melting point and then slowly cooling it. Annealing generally lowers the tensile strength of the material, while improving its flex life and flexibility.
ANSI American National Standards Institute
ANSI MC96.1 Temperature Measurement Thermocouples
ANSI/NCSL Z540-1 Calibration Laboratories and Measuring and Test Equipment General Requirements
ARPANET Advanced Research Projects Agency Network
ASCII American Standard Code for Information Interchange
ASME American Society of Mechanical Engineers
ASP Aluminum Steel Polyethylene. Provides mechanical and electrical protection.
ASP A filled, direct burial telephone cable used in areas subject to rodent attack. It consists of a filled cable core, corrugated aluminum shield, corrugated steel tape, flooding compound and polyethylene jacket.
ASTA United Kingdom approval agency
ASTM The American Society for Testing and Materials, a standards organization which suggests test methods, definitions and practices.
ASTM E207 Thermal EMF Test of Single Thermoelement Materials
ASTM E 220 Calibration of Thermocouples by Comparison Techniques
ASTM E 230 Standard Specification and EMF Tables for Standardized Thermocouples
Asynchronous Transfer Mode The SONET standard for a packet switching technique which uses packets of a fixed length.
ATM The SONET standard for a packet switching technique which uses packets of a fixed length.Asynchronous Transfer Mode.
Atm Atmosphere
Attenuation The decrease in magnitude of a signal as it travels through any transmitting medium, such as a cable or circuitry. Attenuation is measured as the logarithm of a ratio. It is expressed in decibels or dB.
Audio A term used to describe sounds within the range of human hearing. Also used to describe devices which are designed to operate within this range (20 Hz to 20 kHz).
Audio Frequency Frequencies within the range of human hearing
AWG American Wire Gage. A wire diameter specification. The smaller the AWG number, the larger the wire diameter.
AWM Appliance Wiring Material./td>


B drain wire
B Ethylene propylene rubber
B and S Gauge See American Wire Gauge (AWG)
B or BUR Buried
BAC Boeing Aircraft Corporation
BAC-5621 Temperature Control For Processing Materials
Backbone The cable used to connect all systems of a multi-level distributed system to an intermediate system.
Backshell Metal housing providing continuity of shield through IDC connectors.
Balanced Line A cable having two identical conductors which carry voltages opposite in polarity and equal in magnitude with respect to ground, suitable for differential signal transmission.
Balun A device for matching an unbalanced coaxial transmission line to a balanced two-wire system.Can also
Bandwidth The difference between the upper and lower limits of a given band of frequencies. Expressed in Hertz. The range of frequencies that a transmitted communications signal occupies or that a receiving system can accept. For example, it takes more bandwidth to download a photograph in a second than to download a page of text. Virtual reality and three-dimensional audio/visual presentations require even more.
Baud Unit of data transmission speed meaning bits per second (500 baud-500 bits per second).
BCF Billion Conductor Feet
BEF Building Entrance Facility
Bel A unit that represents the logarithm of the ratio of two levels. The number of bels is equal to the logarithm sub 10 of P sub 1/P sub 2) -2 logarithm sub 10 (E sub 1/E sub 2); and 2 logarithm sub 10 (I sub 1/I sub 2). See dB.
Bend Loss A form of increased attenuation caused by (a) having an optical fiber curved around a restrictive radius of curvature or (b) microbends caused by minute distortions in the fiber imposed by externally induced perturbations.
Bend Radius Radius of curvature that a flat, round, fiber optic or metallic cable can bend without any adverse effects.
BER Bit Error Rate
Bi Silicone
BIC Building Industry Consultant
BICSI Building Industry Consulting Service International
Binder A tape or thread used for holding assembled cable components in place.
BISDN Broadband Integrated Services Digital Network
Bit One binary digit.
Bit Error Rate The number of errors occurring in a system per second. Typically less than 10e-12.
Bits Per Second The number of binary bits that can be transmitted per second
BNC Abbreviation for "Bayonet Neil Concelman". A coaxial cable connector used extensively in video and R. F. applications and named for its inventor.
Bonded ASP Aluminum Steel Polyethylene where the steel is bonded to polyethylene for strength. Filled cables for use in ducts.
Bonded Steel Bonded Steel is bonded to polyethylene with a copolymer adhesive All STALPETH and some ASP cables are bonded. Provides extra strength to jacket, primarily used in underground applications.
Bonding The method used to produce good electrical contact between metallic parts of any device. Used extensively in automobiles and aircraft to prevent static buildup. Also refers to the connectors and straps used to bond equipment.
Booster A device or amplifier inserted into a line or cable to increase the voltage. Transformers may be employed to boost ac voltages. The term booster is also applied to antenna preamplifiers.
BPS The number of binary bits that can be transmitted per second
BPSK Bi Phase Shift Keying.
Braid A group of textile or metallic filaments interwoven to form a tubular flexible structure which may be applied over one or more wires, or flattened to form a strap.
Braid Angle The angle between a strand of wire in a braid shield and the axis of the cable it is wound around.
Breakdown Voltage The voltage at which the insulation between two conductors will fail and allow electricity to conduct or 'arc'.
Breakout The point at which a conductor or conductors are separated from a multi-conductor cable to complete circuits at various points along the main cable.
BRI Basic Rate Interface ISDN.
Broadband The technique used to multiplex multiple networks on a single cable without interfering with each other. Technologies that allow you to transmit or receive higher volumes of data at higher speeds.
BTU British Thermal Unit
Buffer A protective coating over an optical fiber.
Buffing Stripper A motorized device for removing flat cable insulation by means of one or two buffing wheels that melt the insulation and brush it away from the conductors. Also called Abrasion Stripper.
Bunch Strand Conductors twisted together with the same lay and direction without regard to geometric pattern.
Bus-bar Wire Uninsulated tinned copper wire used as a common lead.
Butyl Rubber A synthetic rubber with good electrical insulating properties.
Byte A group of adjacent binary digits (8 bits)./td>


C copper braiding
C.S. Carbon Steel
C4 copper wire braiding
CA Cable
Cable A group of individually insulated conductors twisted helically.
Cable Modem A device that enables you to hook up your PC to a local cable TV line and receive data at much faster rates than telephone modems and ISDN lines. A strong competitor to DSL telephone service.
Cabling The grouping or twisting together of two or more insulated conductors to form a cable.
CACSP Coated Aluminum, Coated Steel, Polyethylene. Provides additional strength and protection.
Canadian Electrical Code (CEC) Canadian version of the US National Electrical Code (NEC).
CAP Carrierless Amplitude Phase Modulation.
Capacitance The ability of a dielectric material between conductors to store energy when a difference of potential exists between the conductors. The unit of measurement is the farad. Cable capacitance is usually measured in picofarads (pF).
Capacitive Crosstalk Cable crosstalk or interference resulting from the coupling of the electrostatic field of one conductor upon one or more others.
Capacitive Reactance The opposition to alternating current due to the capacitance of a capacitor, cable, or circuit. It is measured in ohms and is equal to 1/6.28fC where f is the frequency in Hz and C is the capacitance in farads.
Capacitor Two conducting surfaces separated by a dielectric material. The capacitance is determined by the area of the surfaces, type of dielectric, and spacing between the conducting surfaces.
Carrier Strip Also referred to as substrate. A film that is on one side of a laminated flat cable.
CASPIC Coated Aluminum, Coated Steel.
Category Rating of a cable established by TIA/EIA to indicate the level of electrical performance.
Category Cables Belden manufactures Category 3 to 7 cables, all high performance twisted pair data cables. The higher the category number, the greater the bandwidth. Category 7 is currently the highest performance telecommunication wire available. Ours is certified to applicable UL standards.
CATV (1) Community Antenna Television; Cable Access Television (2) CATV Cable, NEC Article 820 Cable Designation
CATVP CATV Plenum Cable, NEC Article 820 Cable Designation
CATVR CATV Riser Cable, NEC Article 820 Cable Designation
CATVX CATV Limited Use Cable, NEC Article 820 Cable Designation
CB Citizens band
CBR Constant Bit Rate.
CC PVC Control cable
C-C Conductor to conductor capacitance
Cc/min Cubic centimeters per minute
CCITT The International Telegraph and Telephone Consultative Committee
CCTV Closed-circuit television.
CCTV Closed-circuit television
CDDI Copper Distributed Data Interface
CDF Central Distribution Frame
CDO Community Dial Office
CEBEC Belgium approval agency; Commite Electrotechnique Belge Service de la Marque
CEE European standards agency; International Commission on Rules for the Approval of Electrical Equipment
CEN European Committee for Standardization
CENELEC European Committee for Electrotechnical Standardization
Center-to-Center Distance Pitch. Nominal distance from center-to-center of adjacent conductors within a cable. When conductors are flat, pitch is usually measured from the reference edge of a conductor to the reference edge of the adjacent conductor.
CFC Communications Flat Cable
CFH Standard Cubic Feet per Hour (SCFH)
Channel The horizontal cable including the workstation outlet and patch panel in the telecommunications closet plus a maximum combined length of up to ten meters of patch cable at each end (maximum length of 100 meters).
Characteristic Impedance In a transmission cable of infinite length, the ratio of the applied voltage to the resultant current at the point the voltage is applied. Or the impedance which makes a transmission cable seem infinitely long, when connected across the cable's output terminals.
Chrominance Signal The portion of a composite video signal that contains the color information.
Circuit A system of conducting media designed to pass an electric current.
Circular Mil The area of a circle one one-thousandth of an inch (.001") in diameter. By knowing the circular mil area of various conductors, they can be used to determine what conductivity and gage size various combinations will produce.
ckt Circuit
CL2 Class 2 Circuit Cable, NEC Article 725 Cable Designation
CL2P Class 2 Circuit Plenum Cable, NEC Article 725 Cable Designation
CL2R Class 2 Circuit Riser Cable, NEC Article 725 Cable Designation
CL2X Class 2 Circuit Limited Use Cable, NEC Article 725 Cable Designation
CL3 Class 3 Circuit Cable, NEC Article 725 Cable Designation
CL3P Class 3 Circuit Plenum Cable, NEC Article 725 Cable Designation
CL3R Class 3 Circuit Riser Cable, NEC Article 725 Cable Designation
CL3X Class 3 Circuit Limited Use Cable, NEC Article 725 Cable Designation
Cladding A low refractive index material that surrounds the core of an optical fiber causing the transmitted light to travel down the core and protects against surface contaminant scattering. A layer of metal applied over another. Cladding is often chosen to improve conductivity or to resist corrosion.
CLT or CLOS Closet
CM Communications Cable, NEC Article 800 Cable Designation
CM Centimetres
CMA Circular Mil Area
CMP Communication Cable Plenum, NEC Article 800 Cable Designation
CMR Communications Cable Riser, NEC Article 800 Cable Designation
CMX Communications Limited Use Cable, NEC Article 800 Cable Designation
CO Central Office
Coaxial Cable A cylindrical transmission line comprised of a conductor centered inside a metallic tube or shield, separated by a dielectric material, and usually covered by an insulating jacket. The kind of cable that links your cable TV provider to your home or office. Also sometimes used by telephone companies from their telephone poles to their customers, and by businesses for local area networks. Because of its high bandwidth, you can simultaneously receive hundreds of channels from coaxial cable.
codec Coder decoder
COE Central Office Equipment
Coil Effect The inductive effect exhibited by a spiral-wrapped shield, especially above audio frequencies.
Color Code A system of different colors or stripes used to identify components of cables such as individual conductors or groups of conductors.
Component Video The unencoded output of a camera, video tape recorder, etc., whereby each red, green, and blue signal is transmitted down a separate cable. Component video systems most commonly use bundled coax as a transmission medium.
Composite Cable Cable having conductors with two or more AWG sizes or more than one cable type.
Composite Video The encoded output of a camera, video tape recorder, etc., whereby the red, green, blue, horizontal and vertical sync are transmitted simultaneously down one cable.
Concentric Stranding A group of uninsulated wires twisted together and containing a center core with subsequent layers spirally wrapped around the core with alternating lay directions to form a single conductor.
Conductivity The ability of a material to allow electrons to flow, measured by the current per unit of voltage applied. It is the reciprocal of resistivity.
Conductor A substance, usually metal, used to transfer electrical energy from point to point.
Conduit A tube of metal or plastic through which wire or cable can be run. Used to protect the wire or cable and, in the case of metal conduit, make it fireproof.
Connector A device designed to allow electrical flow from one wire or cable to a device on another cable. A connector will allow interruption of the circuit or the transfer to another circuit without any cutting of wire or cable or other preparation.
Copperweld Trademark of Copperweld Steel Co. for copper-clad steel conductor.
Cord A very flexible insulated cable.
Core The light conducting central portion of an optical fiber with a refractive index higher than that of the cladding. The center of a cable construction. Most often applies to a coaxial cable, where the core is the center conductor and the dielectric material applied to it.
COS Cooperation for Open Systems
COSINE Cooperation for Open Systems Interconnection Network in Europe
COT Central Office Terminal
Coupling The transfer of energy (without direct electrical contact) between two or more cables or components of a circuit.
Coverage How well a metal shield covers the underlying surface. Measured in percent.
CPC Customer Premises Communication
CPE Chlorinated polyethylene can be used as either a thermoplastic or thermoset. It is a tough chemical and oil-resistant material and makes an excellent jacket for industrial control cable. As a thermoset, it can be used as an oil resistant cord jacket. Other outstanding properties include low water absorption and superior crush resistance, which are important attributes in industrial control applications.
CPE (1) Chlorinated Polyethylene (2) Customer Premises Equipment or Customer Provided Equipment
CPS Abbreviation for cycles per second or Hertz.
CPU Central Processing Unit
Crosstalk A type of interference caused by audio frequencies from one pair being coupled into adjacent pairs.
CRT Cathode Ray Tube
CSA Abbreviation for Canadian Standards Association, the Canadian version of the Underwriters Laboratories.
CSA-C22.2 No. 239 Control and Instrumentation Cable Thermocouples
CSMA/CD Carrier Sense Multiple Access/ Collision Detection
CSMA/D Carrier Sense Multiple Access/Collision Detection.
CSPE Chlorosulfonated Polyethylene
CTR Certified Test Report
Current Carrying Capacity The maximum current a conductor can carry without being heated beyond a safe limit (ampacity).
Current Loop A two wire transmit/receive interface.
Current, Alternating (ac) An electric current that periodically reverses direction of electron flow. The rate at which a full cycle occurs in a given unit of time (generally a second) is called the frequency of the current.
Current, Direct (dc) Electrical current whose electrons flow in one direction only. It maybe constant or pulsating as long as its movement is in the same direction.
Cut-through Resistance A test to determine the ability of a material to withstand the application of blades or sharp edges without being cut.
CV Continuous vulcanization


D copper wrapping
D fine strands for welding cable
D/A Digital to Analogue
D1 A component digital video recording format that conforms to the CCIR-601 standard. Records on 19 mm magnetic tape. (Often used incorrectly to indicate component digital video).
D2 A composite digital video recording format. Records on 19 mm magnetic tape.
D3 A composite digital video recording format.Records on 1/2" magnetic tape.
D-A Digital to analog conversion
DAF Dedicated Access Facility
Daisy Chain A cable assembly with three or more termination areas.
dB Decibel
DBS Direct Broadcast Satellite
dc Direct current
DCE Data Circuit-Terminating Equipment
DCO Digital Central Office
DCR Direct Current Resistance
DD Distribution Designer or Distribution Device
Decibel (dB) A decibel is one-tenth of a bel and is equal to 10 times the logarithm of the power ratio, 20 times the log of the voltage ratio, or 20 times the log of the current ratio. Decibels are also used to express acoustic power, such as the apparent level of a sound. The decibel can express an actual level only when comparing with some definite reference level that is assumed to be zero dB.
Delay Line A transmission line or equivalent device designed to delay a wave or signal for a specific length of time.
DEMARC Demarcation point
DEMKO Approval agency of Denmark
DEPIC Dual Expanded Plastic Insulated Conductor (Foam Skin). Decreases outside diameter of cable.
Derating Factor A multiplier used to reduce the current carrying capacity of conductors in more adverse environments.
DES Data Encryption Standard.
DGM Data Grade Medium
DHCP Dynamic Host Configuration Protocol.
Dia or Diam. Diameter
Dielectric An insulating (non-conducting) medium when used in a signal-carrying design.
Dielectric Breakdown Any change in the properties of a dielectric that causes it to become conductive. Normally a catastrophic failure of an insulation because of excessive voltage.
Dielectric Constant Also called permittivity. That property of a dielectric which determines the amount of electrostatic energy that can be stored by the material when a given voltage is applied to it. Actually, the ratio of the capacitance of a capacitor using the dielectric to the capacitance of an identical capacitor using a vacuum (which has a Dielectric Constant of 1) as a dielectric. A number which indicates the quality of a material to resist holding an electrical charge when placed between two conductors.
Dielectric Heating The heating of an insulating material when placed in a radio-frequency field, caused by internal losses during the rapid polarization reversal of molecules in the material.
Dielectric Loss The power dissipated in a dielectric as the result of the friction produced by molecular motion when an alternating electric field is applied.
Dielectric Strength The voltage an insulation can withstand before it breaks down. Usually expressed as 'volts per mil'.
Dielectric Withstand Voltage The voltage that an insulating material can withstand before breakdown occurs.
Digital Signal An electrical signal which possesses two distinct states (on/off, positive/negative).
DISA Defense Information Systems Agency (formerly DCA)
DISI Directory Information Services Infrastructure
Dispersion The cause of bandwidth limitations in an optical fiber. Dispersion causes a broadening of input pulses along the length of the fiber. Two major types are (a) mode dispersion caused by differential optical path lengths in a multimode fiber, and (b) material dispersion caused by a differential delay of various wavelengths of light in a wave guide material.
DIST District
Distortion Any undesired change in a wave form or signal.
Distribution Cables In a CATV system, the transmission cable between the distribution amplifier and the drop cable.
Disturbed Conductor A conductor that receives energy generated by the field of another conductor or an external source. e.g. the quiet line.
DMT Discrete Multitone.
DOCSIS Data Over Cable Service Interface Specification.
Drain Wire A non-insulated wire in contact with parts of a cable, usually the shield, and used in the termination to that shield and as a ground connection.
Drop Cable In a CATV system, the transmission cable from the distribution cable to a dwelling.
DRT Plastic range and dryer cord (CSA)
DSL Digital Subscriber Line. A technology for bringing high-bandwidth information to homes and small businesses over ordinary copper telephone lines. A DSL line can carry both data and voice signals, with the data part of the line remaining continuously connected. Currently competes with the cable modem in bringing broadband services to homes and small businesses.
DTE Data Terminal Equipment
DVB Digital Video Broadcast.
DVD Digital Versatile Disc
DW Distribution Wire


E Voltage (electromotive force).
E intrinsically safe (blue)
E PE Polyethylene
E ultra-fine strands for welding cable
E Symbol for voltage. Usually used to represent direct voltage or the effective (root-mean-square) value of an alternating voltage
E/W Equipped With
EFP Abbreviation for Electronic Field Production. Video production for commercials, television shows and other non-news purposes done outside the studio.
EFTS Electronic funds transfer system
EIA Electronic Industries Association (formerly RMA or RETMA).
EIA Electronic Industries Association
Elastomer Any material that will return to its original dimensions after being stretched or distorted.
Electromagnetic Referring to the combined electric and magnetic fields caused by electron motion through conductors.
Electromagnetic Coupling The transfer of energy by means of a varying magnetic field. Inductive coupling.
Electron Volt A measure of the energy gained by an electron falling through an electric field produced by one volt.
Electrostatic Pertaining to static electricity, or electricity at rest. An electric charge, for example.
Electrostatic Coupling The transfer of energy by means of a varying electrostatic field. Capacitive coupling.
ELFEXT Equal level Far End Crosstalk (dB)
Elongation The increase in length of a wire or cable cause by longitudinal tension.
EMF Electromotive force (voltage).
EMF Electromotive Force
EMI Abbreviation for electromagnetic interference.
EMI Electromagnetic Interference
EMI Electromagnetic Interference
EMT Electric Metallic Tubing
Energy The capability of doing work.
Energy Dissipation Loss of energy from a system due to the conversion of work energy into an undesirable form usually heat. Dissipation of electrical energy occurs when current flows through a resistance.
ENG Abbreviation for Electronic News Gathering.
EP Entrance point
EPDM Ethylene-propylene-diene monomer rubber. A chemically cross-linked elastomer with good electrical insulating properties and excellent flexibility at high and low temperatures. It has good insulation resistance and dielectric strength, as well as excellent abrasion resistance and mechanical properties. EPDM has better cut-through resistance than Silicone rubber, which it replaces in some applications.
EPDM Ethylene-propylene-diene monomer rubber
EPOS Electronic Point-Of-Sale
EPR Ethylene-propylene copolymer rubber. A material with good electrical insulating properties.
EPR Ethylene-propylene rubber
EPR Ethylene Propylene Rubber
Equilay More than one layer of helically laid wires with the length of the lay the same for each layer.
ER Equipment room
ESS Electronic Switching System
ESTA Australian approval agency; Electricity Trust of South Australia
ETP Abbreviation for a copper refining process called Electrolytic Tough Pitch. This process produces a conductor that is 99.95% pure copper resulting in high conductivity.
ETPC Electrolytic Tough Pitch Copper
ETV Educational Television
EV Electron volt.
EX or EXT Extension
EXCH Exchange
Expanded Polyethylene Expanded or "foam" polyethylene, consists of individual closed cells of inert gas suspended in a polyethylene medium, resulting in a desirable reduction of the dielectric constant.
Extruded Cable Conductors are simultaneously insulated and the cable is formed by a continuous extrusion process.


f Frequency.
F fine strands (flexible use)
F fine strands (flexible use)
F flexible
F flexible
f Frequency
F.S. Full scale
FAA Federal Aeronautics Administration
FAS Fire Alarm and Signal Cable, CSA (Canadian Standards Association) Cable Designation.
FCC (1) Federal Communications Commission (2) Flat Conductor Cable, NEC Article 328 Cable Designation
FCFC Abbreviation for flat conductor flat cable.
FDA U.S. Food and Drug Administration
FDDI Fiber Data Distribution Interface.
FDDI Fiber Distributed Data Interface
FDM Frequency-Division Multiplexing
FDR Feeder
FEC Forward Error Correction.
Feedback Energy that is extracted from a high-level point in a circuit and applied to a lower level. Positive feedback reduces the stability of a device and is used to increase the sensitivity or produce oscillation in a system. Negative feedback, also called inverse feedback, increases the stability of a system as the feedback improves stability and fidelity.
Feeder Cable In a CATV system, the transmission cable from the head end (signal pickup) to the trunk amplifier.Also called a trunk cable.
FEP Fluorinated ethylene-propylene. A thermo-plastic material with good electrical insulating properties and chemical and heat resistance.
FEP Fluorinated ethylene propylene
Ferrous Composed of and/or containing iron. A ferrous metal exhibits magnetic characteristics.
FEXT Far End Crosstalk (dB)
FEXT Far End Crosstalk
FI Approval agency of Finland; Electrical Inspectorate
Fiber A single, separate optical transmission element characterized by core and cladding.
Fiber Optics Light transmission through optical fibers for communication and signaling. A technology that transmits information as light pulses along a glass or plastic fiber. Optical fiber carries much more information than conventional copper wire and is generally not subject to interference. Most telephone company long-distance lines are optical fiber.
Fiber to the home (FTTH) A technology that provides voice, data and video services from the phone company's branch office to local customers over an all-fiber optic link. Still in its infancy, FTTH technology is substantially more expensive and labor-intensive to install and maintain than competing technologies.
Field An area through which electric and/or magnetic lines of force pass.
Filled Cables that are gel filled.
Fillers Nonconducting components cabled with the insulated conductors or optical fibers to impart roundness, flexibility, tensile strength, or a combination of all three, to the cable.
FIPS Pub Federal Information Processing Standard Publication
Flame Resistance The ability of a material not to fuel a flame once the source of heat is removed.
Flat Cable Also referred to as planar and/or ribbon cable. Any cable with two or more parallel conductors in the same plane encapsulated by insulating material.
Flat Conductor A conductor with a width-to-thickness ratio or arbitrarily 5 to 1 or greater.
Flat Conductor Cable A flat cable with a plurality of flat conductors.
Flex Life The ability of a cable to bend many times before breaking.
Flexibility The ability of a cable to bend in a short radius. The ability of a cable to lay flat or conform to a surface as with microphone cables.
Floating Referring to a circuit which has no connection to ground.
Fluorocopolymer Generic term for PVDF.
FM Frequency modulation.
FM Frequency modulation
FNPT Female National Pipe Thread
Foam Polyethylene Expanded or "foam" polyethylene, consists of individual closed cells of inert gas suspended in a polyethylene medium, resulting in a desirable reduction of the dielectric constant.
FOCIS Fiber Optic Connector Intermateability Standard
FOTP Fiber Optic Test Procedure
FOTS Fiber Optics Transmission System
FPL Power Limited Fire Protective Signaling Circuit Cable, NEC Article 760 Cable Designation
FPLP Power Limited Fire Protective Signaling Circuit Plenum Cable, NEC Article 760 Cable Designation
FPLR Power Limited Fire Protective Signaling Circuit Riser Cable, NEC Article 760 Cable Designation
FPM Feet per Minute
FPS Feet per Second
FR-1 A flammability rating established by Underwriter's Laboratories for wires and cables that pass a specially designed vertical flame test
FREP Flame retardant ethylene propylene is a special flame retardant version of EPDM rubber. It is designed for use as an industrial control insulation and has excellent electrical, deformation resistance, and also meets the flame retardant needs of industrial control cables.
freq Frequency
Frequency The number of times a periodic action occurs in one second. Measured in Hertz.
Frequency Response The characteristic of a device denoting the range of frequencies over which it may be used effectively.
Frequency, Power Normally, the 50 or 60 hertz power available in residential areas.
FRICC Federal Research Internet Coordinating Committee (now FNC)
FRPE Flame Retardant Polyethylene
FR-TPE FR-TPE, flame retarded thermoplastic elastomer, is a rubber-like plastic that has properties similar to rubber yet is processed as a thermoplastic. It is used as the insulation and jacket in an all TPE construction which meets UL 13 and 1277 industrial cable requirements. It has good electrical properties, abrasion resistance, colorability and flame retardancy. This compound is ideal for cold weather applications.
FSK Frequency Shift Key.
ft Foot
Ft Feet
FTP Fire Transfer Protocol
FTTC Fiber-to-the-Curb.


G Rubber
G Rubber
G with green yellow ground wire
G with green yellow ground wire
g Grams
ga Gauge
Gage The physical diameter of a wire. A standard for expressing wire diameter. As the AWG number gets smaller, the wire diameter gets larger.
Gain The increase of voltage, current, or power over a standard or previous reading. Usually expressed in decibels.
Gal Gallons
gHZ Gigahertz
Giga One billion.
Gigahertz (GHz) A unit of frequency equal to one billion hertz.
GL Fiber-glass
GL Fibre-glass
GPH Gallons per Hour
GPM Gallons per Minute
grd Ground
Ground An electrical connection between a circuit and the earth. Also refers to a conductor connected to earth. In some instances, can refer to a central metallic point designated as having "zero" potential.
Ground Conductor A conductor in a transmission cable or line that is grounded.
Ground Loop A completed circuit between shielded pairs of a multiple pair created by random contact between shields. An undesirable circuit condition in which interference is created by ground currents when grounds are connected at more than one point.
Ground Potential The potential of the earth. A circuit, terminal, or chassis is said to be at ground potential when it is used as a reference point for other potentials in the system.
GTO Gas tube sign and oil-burner ignition cable.5,000V-15,000V.


H divisible flat cable
H harmonized type
H ultra-fine strands (flexible use)
H Designation for intensity of magnetic energy
H/L High –Low
H2 non-divisible flat cable
H6 non-divisible flat cable for elevators
H8 helix cable
Harness A flat cable or group of cables, usually with many breakouts with the wire ends prepared for termination or terminated to connectors and ready to install.
hc Handset combination (single-line telephone)
HC Horizontal cross-connect
hck Handset combination; key (six-button telephone)
HDPE High Density Polyethylene
HDSL High bit-rate Digital Subscriber Line.
Headroom The amount by which a cable ACR exceeds 10 dB. The TIA/EIA 568B standard states a minimum of 10 dB of ACR is required for Category 5 certification.
Hertz (Hz) The number of changes in polarity which a signal makes in one second. An indication of frequency. Replaces cycles-per-second.
Heterogeneous Insulation A cable insulating system composed of two or more layers of different insulating materials.
HF High frequency.
HF High Frequency
HFC Hybrid Fiber/Coaxial.
hh Handhole
High Frequency The band from 3 to 30 MHz in the radio spectrum, as designated by the Federal Communications Commission.
Hi-Pot A test designed to determine the highest voltage that can be applied to a conductor without breaking through the insulation.
HM2 halogen free thermoplast (Begum)
HM2 halogen free thermo-plastic (Begum)
Homogeneous Insulation A complete cable insulation structure whose components cannot be identified as layers of different materials.
Hook-Up Wire Single conductor wire with various types of insulation.
Horizontal Cable Cable used to go between the workstation outlet and the telecommunications closet.
HPD Rubber- and asbestos-insulated heater cord. No braid on individual conductors but with braid overall. Also made with neoprene insulation and no asbestos or PVC/NBC.
HPN Two-conductor, neoprene-insulated heater cord. Parallel construction. For use in damp locations.
HSCDS High-Speed Cable Data Service.
HSJ Same as type HS but with #18, #16 and #14 conductors and differing thickness of jacket.
HTTP Hypertext Transmission Protocol.
HVAC Heating, ventilation and air conditioning
Hz Hertz


i Symbol used to designate current
I.D. Inside Diameter
I/O Input/Output
I/O Interconnection Input/Output interface to the "outside world."
Ib Pound, Pounds
Ib/IN2 Pounds per Square Inch
IC Intermediate cross-connect
ICEA Insulated Cable Engineers Association
IDC Insulation Displacement Connector
IDSL ISDN Digital Subscriber Line.
IEC Internation Electrotechnical Commission
IEC 584 Standard Test for Class 1E Cables for Nuclear Generation Stations
IEEE Institute of Electrical and Electronics Engineers
IEEE 383 General Requirements for the Competence of Calibration and Testing Laboratories
IF Intermediate-frequency.
IFB Abbreviation for Interrupted Feed Back, a monitoring scheme often used in television where the feed of program audio can be interrupted with directions, cues or other information.
IGS Integrated Gas Spacer Cable, NEC Article 325 Cable Designation
IMSA International Municipal Signal Association
in Inch
Input A signal (or power) which is applied to a piece of electric apparatus or the terminals on the apparatus to which a signal or power is applied.
Insertion Loss A measure of the attenuation of a cable or component by determining the output of a system before and after the device is inserted into the system.
Insulation A material having good dielectric properties which is used to separate close electrical components, such as cable conductors and circuit components.
Insulation Stress The molecule separation pressure caused by a potential difference across an insulator. The practical stress on insulation is expressed in volts per mil.
Interface The region where two systems or a major and a minor system meet and interact with each other.
Interference Disturbances of an electrical or electromagnetic nature that introduce undesirable responses into other electronic equipment.
Intermediate Frequency A frequency to which a signal is converted for ease of handling. Receives its name from the fact that it is an intermediate step between the initial and final conversion or detection stages.
IR Insulation Resistance.
IR Drop The designation of a voltage drop in terms of current and resistance.
IRSG Internet Research Steering Group
IRTF Internet Research Task Force
IS International Standard
ISA Instrument Society of America
ISDN Integrated Services Digital Network. An alternative to telephone modems that allows digital transmission over ordinary telephone copper wire and other media. Home and business users can get highly graphic Web pages more quickly through ISDN adapters than through dial-up connections.
ISDN Integrated Services Digital Network
ISO International Standards Organization.
ISO International Organization for Standardization
ISO 9001-2000 ISO 9001-2000 Quality Management
ISOC Internet Society
Isolation The ability of a circuit or component to reject interference, usually expressed in dB.
ISP Internet Service Provider.
ITCO Independent Telephone Company
ITU-T International Telecommunications Union
IW © Inside Wiring (cable)


J Fibre-glass braiding
J with green yellow ground wire
J Joule
Jacket Pertaining to wire and cable, the outer protective covering (may also provide additional insulation).
Jumper A short length of conductor or flat cable used to make a connection between terminals or around a break in a circuit, or between circuit boards.


K fine strands (fixed laying)
KB Kilobyte.
kcmil One thousand circular mils
KEMA KEUR Approval agency of the Netherlands
KEV 1000 electron volts.
kft An abbreviation for 1000 ft.
kHz Kilohertz
Kilo One thousand.
Kilo A numerical prefix denoting 1000 (103)
km Kilometer
KTS Key Telephone Service
kV Kilovolt (1000 volts).
kV Kilovolt
kVA Kilovolt Ampere
kW Kilowatt


L Symbol for inductance.
Laminated Cable Insulated or uninsulated wires which are encapsulated by two sheets of laminate material to maintain a predetermined pitch.
LAN A data network connecting any number of users, intended to serve a small area. Local Area Network. A group of computers and associated devices that share a common communications line and typically share the resources of a single processor or server within a small geographic area.
Laser A coherent source of light with a narrow beam and a narrow spectral bandwidth (about 2nm).
LASER Light Amplification by Stimulated Emission of Radiation
LATA Local Access Transport Area
Lay The length measured along the axis of a wire or cable required for a single strand (in stranded wire) or conductor (in cable) to make one complete turn about the axis of the conductor or cable. In a twisted pair cable, the lay length is the distance it takes for the two wires to completely twist around each other.
Lay Direction The direction of the progressing spiral twist in a cable while looking along the axis of the cable away from the observer. The lay direction can be either "left" or "right".
lbf Pound force
LBO Line Buildout
LDPE Low Density Polyethylene
Lead Dress The placement or routing of wiring and component leads in an electrical circuit.
Lead-in The cable that provides the path for r-f energy between the antenna and the receiver or transmitter.
Leakage The undesirable passage of current over the surface of or through an insulator.
LEC Local Exchange Carrier
LED Light-Emitting Diode
Level A measure of the difference between a quantity or value and an established reference.
LF Low frequency.
Li strands (Data cable)
Line Drop A voltage loss occurring between any two points in a power or transmission line. Such loss, or drop, is due to the resistance, reactance, or leakage of the line.
Line Equalizer A reactance (inductance and/or capacitance) connected in series with a transmission line to alter the frequency-response characteristics of the line.
Line Level Refers to the output voltage level of a piece of electronic equipment. Usually expressed in decibels (e.g.. 0dBv).
Line Voltage The value of the potential existing on a supply or power line.
Link The horizontal cable including the workstation outlet and patch panel in the telecommunications closet plus two meters of cable at each end for testing.
LLDPE Linear Low Density Polyethylene
LMDS Local Multipoint Distribution Service
Load A device that consumes power from a source and uses that power to perform a function.
Loaded Line A transmission line that has lumped elements (inductance or capacitance) added at uniformly spaced intervals. Loading is used to provide a given set of characteristics to a transmission line.
Loading A transmission line that has lumped elements (inductance or capacitance) added at uniformly spaced intervals. Loading is used to provide a given set of characteristics to a transmission line.
LOCA Loss of Coolant Accident
Local Area Network A data network connecting any number of users, intended to serve a small area.
locap Low-capacitance, low-loss paired cable
Long-wire Antenna Any conductor length in excess of one-half of a wavelength. In a residential television installation, a horizontal run or unshielded lead-in will act as a long-wire antenna and introduce additional signal on top of the regular antenna signal causing ghosts.
Loss Energy or signal lost without accomplishing useful work.
Low Frequency A band of frequencies extending form 30 to 300 kHz in the radio spectrum, designated by the Federal Communications Commission.
LPML/min Litres per Minute, Litres per Minute
Luminance Signal The portion of the composite video signal that represents the brightness or the black and white information.


m Metres
M/G Motor/Generator Set
m/sec Metres per second
MAC Media Access Control (layer of OSI Reference Model).
MAN A data network intended to serve the area of a city or an area of similar size.
Manufacturing Automation Protocol A manufacturing automation protocol based on IEEE 802.4 standards.
MAP A manufacturing automation protocol based on IEEE 802.4 standards.
Margin Distance between reference edge of cable and nearest edge of first conductor or center of first conductor.
Mass-Termination The process of simultaneously terminating all conductors in a single operation.
Matte Finish PVC A special formulation of PVC which very closely looks and feels like rubber.
MATV Master Antenna Television
MB Megabyte.
Mbps Mega bits per second
Mbps Megabits per second
MC (1) main cross-connect (2) Metal Clad Cable,
MCM One thousand circular mils
MDF Main Distribution Frame
MDPE Medium Density Polyethylene
Meg or Mega A numerical prefix denoting 1,000,000 (106)
Mega Prefix meaning million.
Megahertz (MHz) Unit of frequency equal to one million hertz (one million hertz per second).
Metropolitan Area Network A data network intended to serve the area of a city or an area of similar size.
mFd Microfarad (one-millionth of a farad).
MH Manhole
Mho The unit of conductivity. The reciprocal of an ohm.
MHz Megahertz
MI Mineral Insulated Cable, NEC Article 330 Cable Designation
Micro Prefix meaning one-millionth.
Micro A numerical prefix denoting one-millionth
Micron Millionth of a meter.
Microphonics Noise caused by mechanical excitation of a system component. In a single-conductor microphone cable, for example, microphonics can be caused by the shield rubbing against the dielectric as the cable is flexed.
Mil A unit of length equal to one thousandth of an inch (.001").
MIL STD Military Standard
Milli Prefix meaning one-thousandth.
MILNET Military Network
mL/min milli Litres per Minute
MLT Multi-Level Threshold
mm Millimeter
mm Millimetres
MMDS Multichannel Multipoint Distribution Service.
MNPT Male National Pipe Thread
Mode A single electromagnetic wave traveling in an optical fiber.
Modem Device that converts signals in one form to another form compatible with another kind of equipment.
Modem Modulator demodulator
Modulation Altering the characteristics of a carrier wave to convey information. Modulation techniques include amplitude frequency, phase, plus many other forms of on-off digital coding.
Molded Cable Cable assemblies with molded connectors on one or both ends.
Mono Filament A single strand filament as opposed to a braided or twisted filament.
ms Milliseconds
MSEC Milliseconds
MSO Multiple System Operator.
MTP Simple Mail Transfer Protocol.
MTT Main Telephone Terminal
MTW Machine Tool Wire
Multi-Conductor Cable Cable with more than one conductor.
Multiplex A technique for putting two or more signals into a single channel.
multiplication multiplication of carriers in the junction region. The advantage in using an APD is its higher signal-to-noise ratio, especially at high bit rates.
Mutual Capacitance Capacitance between two conductors when all other conductors are connected together and grounded.
mV Millivolt (one-thousandth of a volt).
MV Medium Voltage Cable, NEC Article 326 Cable Designation
mW Milliwatt (one-thousandth of a watt).
MW Radio hookup wire with polyvinyl insulation and plain or nylon jacket or braid, or shield, 1000V


N Chloroprene rubber
N national standard
N Newton
NAIC Network Applications and Information Center
Nano One-billionth.
Nanometer (nm) One billionth of a meter.
Nanosecond One billionth of a second.
NASA National Aeronautics and Space Administration
National Electrical Code (NEC) A publication of the National Fire Protection Association (NFPA) which outlines requirements for electrical wiring and building construction. Also called the NEC.
NBR Natural butadiene-acrylonitrile copolymer rubber
NBS National Bureau of Standards (now NIST)
NCSL National Conference of Standard Laboratories
NEC A publication of the National Fire Protection Association (NFPA) which outlines requirements for electrical wiring and building construction. Also called the NEC.
NEC National Electrical Code
NEC Article 334 Cable Designation  
NEMA National Electrical Manufacturers Association
NEMKO Approval agency of Norway
Neoprene A synthetic rubber with good resistance to oil, chemical, and flame. Also called polychloroprene.
NESC National Electrical Safety Code
Network A network is a method of data communications between computers.
NEXT Near end Crosstalk (dB)
nf Nanofarad
NFPA National Fire Protection Association
NI Network Interface
Nibble One half byte (4 bits).
NiCad Nickel Cadmium
NID Network Interface Device
NIST National Institute of Standards and Technology (formerly NBS)
NIU Network Interface Unit
nm Nanometer
NM & NMC Non Metallic Sheathed Cable, NEC Article 336 Cable Designation
NO/NC Normally Open / Normally Closed
Noise In a cable or circuit, any extraneous signal which tends to interfere with the signal normally present in or passing through the system.
Non-Paired Cable Cable with two or more cabled conductors that are not in a paired configuration.
Non-Plenum Area that a cable can be installed in a building that is not used for air return.
NPLF Non Power-Limited Fire Protective Signaling Circuit Cable, NEC Article 760 Cable Designation
NPLFP Non Power-Limited Fire Protective Signaling Circuit Plenum Cable, NEC Article 760 Cable Designation
NPLFR Non Power-Limited Fire Protective Signaling Circuit Plenum Cable, NEC Article 760 Cable Designation
NPT National Pipe Thread
NRZ Non Return to Zero
NRZI Non Return to Zero Inverted
Numerical Aperture (NA) A measure of the angular acceptance for a fiber. It is approximately the sine of the half-angle of the acceptance cone.
Nylon An abrasion-resistant thermoplastic with good chemical resistance.


O.D. Outside Diameter
OC Optical Carrier
ODC Ozone Depleting Chemical
OFHC Abbreviation for oxygen-free, high conductivity copper. It has 99.95% minimum copper content and an average annealed conductivity of 101% compared to standard copper.
Ohm The unit of electrical resistance. The value of resistance through which a potential difference of one volt will maintain a current of one ampere.
OP Outside Plant
OPE Outside Plant Engineer
Optical Waveguide Fiber A transparent filament of high refractive index core and low refractive index cladding that transmits light.
OSHA Occupational Safety and Health Administration
OSI Open System Interconnect (Model for networking protocols).
OSI Open Systems Interconnection
Output The useful power or signal delivered by a circuit or device.
OVE Approval agency of West Germany; Oesterreichischer Verband fur Elektrotechnik


P steel wire protection
PABX Private Automatic Branch Exchange
Paired Cable Cable with conductors cabled in groups of two.
PAM Pulse Amplitude Modulation
PAP A commonly used term for air core (unfilled) direct burial telephone cable with a corrugated aluminum shield
Parallel Circuit A circuit in which the identical voltage is presented to all components, with current dividing among the components according to the resistances or the impedances of the components.
Parallel Digital Digital information that is transmitted in parallel form. Often used informally to refer to parallel digital television signals.
Patchcord A flexible piece of cable terminated at both ends with plugs. Used for interconnecting circuits on a patchboard.
PBX Private Branch Exchange
PC Personal Computer
PCB Printed Circuit Board
PCM Pulse Code Modulation
PCP A commonly used term for air core (unfilled) direct burial cable with a corrugated copper shield
PE Polyethylene
Peak The maximum instantaneous value of a varying current or voltage.
pf Picofarad
PFA Polyfluoroalkoxy
P-FEP General Cable proprietary dielectric material used injunction with FEP.
Phase An angular relationship between waves.
Phase Shift A change in the phase relationship between two alternating quantities.
Physical Layer The actual portion of a network that is used to physically connect computers of a network and over which the data is transmitted
PIC Plastic Insulated Conductor. Provides strong insulation. A general term for any type of plastic insulated telephone cable
Pico A numerical prefix denoting one-millionth of one-millionth (10-12) (One-trillionth)
PL Private Lines
Plenum A compartment or chamber to which one or more air ducts are connected and that forms part of the air distribution system.
PLSJ All-rubber, parallel-jacketed, twoconductor, light-duty cord for pendant or portable use in damp locations. 300V.
PLT (1) Plant (2) Same as PLSJ except thermoplastic insulation
PLTC Power Limited Tray Cable, NEC Article 725 Cable Designation. A male housing with male or female contacts.
PM Phase Modulation
POI Point Of Interface
Point-to-Point Wiring Wiring that consists of continuous conductors terminated at each end to circuit destination.
Polarization The orientation of a flat cable or a rectangular connector. e.g., for gray flat cable, the colored edge indicating the number one conductor.
Polyethylene A thermoplastic material having excellent electrical properties. Low dielectric constant, a stable dielectric constant over all frequencies, very high insulation resistance. In terms of flexibility, polyethylene can be rated stiff to very hard, depending on molecular weight and density
Polypropylene A thermoplastic similar to polyethylene but stiffer and having a higher softening point (temperature). This material is primarily used as an insulation material. Typically, it is harder than polyethylene. This makes it suitable for thin wall insulations. The dielectric constant is 2.25 for solid and 1.55 for cellular designs.
Polyurethane (PUR) Broad class of polymers noted for good abrasion and solvent resistance. Can be in solid or cellular form. This thermoplastic material is used primarily as a cable jacket material. It has excellent oxidation, oil, and ozone resistance. Some formulations also have good flame resistance. It is a hard material with excellent abrasion resistance. It has outstanding "memory" properties, making it an ideal jacket material for retractile cords.
Polyvinyl chloride A general purpose thermoplastic used for wire and cable insulation and jackets.
Portable Cordage Cable with two or more twisted conductors for flexible applications. Also called flexible cord.
POSJ All-rubber, parallel, light duty rip-cord for use on lamps and small appliances, 300V, 60°C
POT Thermoplastic, parallel, light duty rip-cord. 300V, 60°C to 105°C.
POTS Plain Old Telephone Service (colloquial)
Power The amount of work per unit of time. Usually expressed in watts and equal to the formula for power in watts. (I to the second power times R).
Power Loss The difference between the total power delivered to a circuit, cable, or device and the power delivered by that device to a load.
Power Ratio The ratio of power appearing at the load to the input power. Expressed in dB.
PP Polypropylene
P-P Peak to Peak
PPP Point-to-Point Protocol.
PR Pair
Precision Video Video coaxial cables having very tight electrical tolerances in impedance, velocity of propagation, attenuation and structural return loss. Used in high quality applications such as live broadcast in network studios and pre- or post-production facilities.
Premise Cabling Refers to the entire cabling system used for voice, data, video and power on a user's premise. For Local Area Networks, the cabling of choice includes unshielded twisted pairs (UTP), fiber optic and coaxial cables. Of these, the UTP market is the largest, with greatest demand for cables with four pairs that meet certain standards of performance, such as Category 5 and Category 5e.
PRI Primary Rate Interface ISDN.
Propagation Delay Time required for a signal to pass from the input to the output of a device. provide impedance transformation, as 300 ohm balanced to 75 ohm unbalanced.
Pseudo Random NRZ A wave form of binary signals that may be used in a computer system. It is called NRZ, Non-Return to Zero, because the voltage does not return to zero.
Psia Pounds per Square Inch Absolute
Psid Pounds per Square Inch Differential
Psig Pounds per Square Inch Gauge
PSTN Public Switched Telephone Network.
PTFE Polytetrafluoroethylene
PTSS Passive Transmission Sub-System
PU Polyurethane Jacketing materials
Pulse A current or voltage which changes abruptly from one value to another and back to the original value in a finite length of time. Used to describe one particular variation in a series of wave motions.
Putup Packaging of finished wire or cable.
PVC Polyvinyl chloride. Sometimes referred to as vinyl.Fire resistant.
PVC Polyvinyl Chloride
PVDF Polyvinylidene Fluoride
PVDF Polyvinyliden Fluoride (kynar)


Q- Polyurethane
Quad A four conductor cable. Also called "star quad".


R Symbol for resistance.
R multi-wire
R Rubber
R Symbol for resistance
Radio Frequency (RF) Radio-frequency. Usually considered to be frequencies ranging from 1 MHz to 3GHz. Used to transmit information from point to point over the airwaves or down coaxial cable.
RAM Random Access Memory.
Rated Temperature The maximum temperature at which an electric component can operate for extended periods without loss of its basic properties.
Rated Voltage The maximum voltage at which an electric component can operate for extended periods without undue degradation or safety hazard.
RCDD Registered Communication Distribution Designer
RDC Regional Data Center.
REA Rural Electrification Administration
Reactance A measure of the combined effects of capacitance and inductance on an alternating current. The amount of such opposition varies with the frequency of the current. The reactance of a capacitor decreases with an increase in frequency; the opposite occurs with an inductance.
Receiver An electronic package that converts light energy to electrical energy in a fiber optic system.
Receptacle A female housing with male or female contacts.
Reference Edge Edge of cable or conductor from which measurements are made. Sometimes indicated by a thread, identification stripe, or printing. Conductors are usually identified by their sequential position from the reference edge, with number one conductor closest to this edge.
Reflection The change in direction (or return) of waves striking a surface. For example, electromagnetic energy reflections can occur at an impedance mismatch in a transmission line, causing standing waves.
Reflection Loss The part of a signal which is lost due to reflection of power at a line discontinuity.
REP Repair
Repeater A receiver and transmitter combination used to regenerate an attenuated signal.
Resistance In dc circuits, the opposition a material offers to current flow, measured in ohms. In ac circuits, resistance is the real component of impedance, and may be higher than the value measured at dc.
RF Raised Face
R-F Radio-frequency
RFI Radio Frequency Interference
RFQ Request for Quote
RG/U RG is the abbreviation for "radio guide," a military designation for a coaxial cable, and "U" stands for "universal."
RH Relative humidity
Ribbon Cable A flat cable made with parallel round conductors in the same plane. Also referred to as planar and/or flat cable. Any cable with two or more parallel conductors in the same plane encapsulated by insulating material.
Ringing Out The process of locating or identifying specific conductor paths by means of passing a current through selected conductors.
RJ-45 A specific pin-point assignment for an eight position modular telecommunications connector.
RMS (1) rack mount space (2) Root Mean Squares
RMS Root Mean Square
RoHS Restriction on Hazardous Substances
Round Conductor Flat Cable (RCFC) A cable made with parallel round conductors in the same plane.
Routing The path followed by a cable or conductor.
Rubber (Wire Insulation) A general term used to describe wire insulations made of thermosetting elastomers, such as natural or synthetic rubbers, neoprene, Hypalon, butyl rubber, and others.


UL Underwriters Laboratories



W Symbol for watt or wattage
WA Work area
Wall Thickness The thickness of an insulation or jacket.
WAN Wide Area Network.
Watt A unit of electrical power.
Wave Form A graphical representation of a varying quantity. Usually, time is represented on the horizontal axis, and the current or voltage value is represented on the vertical axis.
Wavelength The distance between positive peaks of a signal. As the frequency increases, and waves get closer together, the wavelength decreases.
Wire A conductor, either bare or insulated.
WP Waterproof Outlet


X Symbol for reactance.
X without green yellow ground wire
X XPE, cross linked PE
X Cross-connect
XLPE Crosslinked polyethylene is a thermoset and is crosslinked by radiation, thermally, or by moisture. XLPE offers a wide range of operating temperatures, excellent deformation, abrasion, and flame resistance. XLPE can be formulated with halogenated or non-halogenated flame retardant packages. Some grades are also rated XHHW-2 which offers excellent wet electrical properties.
XLR A multi-pin audio Connector (typically 3 pins) used in microphone, line level and snake cable connections.
XPE-PVC Expanded Polyethylene Polyvinyl Chloride. Fire retardant.


YK cold resistant PVC
YOE oil resistant PVC
YW heat resistant PVC


Z numbered control cable
Z Symbol for impedance
μm Micron or micrometer


Active Power P Active power P (in kW)   - Single phase (1 phase and neutral): P = V I cos φ
  - Single phase (phase to phase): P = U I cos φ
  - Three phase (3 wires or 3 wires + neutral): P = ρίζα3 επί U επί I επί cos φ
Apparent power S Apparent power S (in kVA)   - Single phase (1 phase and neutral): S = V I
  - Single phase (phase to phase): S = U I
  - Three phase (3 wires or 3 wires + neutral): P = ρίζα3 επί U επί I
V = Voltage between phase and neutral
U = Voltage between phases
I = Line current
φ = Phase angle between vectors V and I.
  - For balanced and near-balanced loads on 4-wire systems


Cy Filter star capacitance - Cy Cy = Nc επί (1-P/100)/Un2 επί 2 επί π επί f
Nc = Filter-nominal power
Un = Grid voltage
P = Detuning ratio
f = Grid frequency


E Energy

(in kilowatt-hours, or kWh) is the TOTAL amount of electricity used/produced over a period of time.
ENERGY = POWER x TIME or the equivalent,POWER = ENERGY / TIME
E  =  (100 Watts) x (10 hours)  =  1000 Watt-hours (Wh)  =  1 kilowatt-hour (kWh)   since "kilo" means 1000

Effective Current RMS current  
Effective Voltage same as RMS voltage  


fr Calculation of resonance points - fr fr = 50 επί ρίζα(ST επί 100/Qcεπί uk)
ST =Transformator-nominal power [kVA]
Qc = Nominal power of the capacitor bank [kVAr]
uk = Transformator impedancy [%]    
FRes Filter frequency - fres fres = f/ ρίζα (P/100)
f = Grid frequency
P = Detuning ratio


L Filter inductance – L L = P/100 επί 4 επί π2 επί f2 επί Cy
P = Detuning ratio
f = Grid frequency
Cy = Star capacitance    


Modbus Modbus is a serial communications protocol originally published by Modicon (now Schneider Electric) in 1979 for use with its programmable logic controllers (PLCs). Simple and robust, it has since become a de facto standard communication protocol, and it is now a commonly available means of connecting industrial electronic devices.[1] The main reasons for the use of Modbus in the industrial environment are:

    It has been developed with industrial applications in mind
    It is openly published and royalty-free
    It is easy to deploy and maintain
    It moves raw bits or words without placing many restrictions on vendors

Modbus allows for communication between many (approximately 240) devices connected to the same network, for example a system that measures temperature and humidity and communicates the results to a computer. Modbus is often used to connect a supervisory computer with a remote terminal unit (RTU) in supervisory control and data acquisition (SCADA) systems. Many of the data types are named from its use in driving relays: a single-bit physical output is called a coil, and a single-bit physical input is called a discrete input or a contact.

The development and update of Modbus protocols has been managed by the Modbus Organization since April 2004, when Schneider Electric transferred rights to that organization, signaling a clear commitment to openness. The Modbus Organization is an association formed of independent users and suppliers of Modbus compliant devices that seeks to drive the adoption of the Modbus communication protocol suite, and its evolution to address architectures for distributed automation systems across multiple market segments. Source and more about Modbus here
Modbus ASCII  This is used in serial communication & makes use of ASCII characters for protocol communication. The ASCII format uses a longitudinal redundancy check checksum. Modbus ASCII messages are framed by leading colon (':') and trailing newline (CR/LF).
ModBus RTU This is used in serial communication & makes use of a compact, binary representation of the data for protocol communication. The RTU format follows the commands/data with a cyclic redundancy check checksum as an error check mechanism to ensure the reliability of data. Modbus RTU is the most common implementation available for Modbus. A Modbus RTU message must be transmitted continuously without inter-character hesitations. Modbus messages are framed (separated) by idle (silent) periods. 
 Modbus TCP This is a Modbus variant used for communications over TCP/IP networks, connecting over port 502.[4] It does not require a checksum calculation as lower layers already provide checksum protection.


OSSD OSSD = Output Signal Switching Device OSSD is a safe switching output in a opto-electronic protective device


P Power (measured in Watts, or W) is the instantaneous RATE of using or producing electrical energy  
P Active Power βλέπε Active Power  
PLC Programmable Logic Controller A PLC is a digital computer used for automation of electromechanical processes, such as control of machinery on factory assembly lines, amusement rides, or light fixtures. The abbreviation "PLC" and the term "Programmable Logic Controller" are registered trademarks of the Allen-Bradley Company (Rockwell Automation)[1]. PLCs are used in many industries and machines. Unlike general-purpose computers, the PLC is designed for multiple inputs and output arrangements, extended temperature ranges, immunity to electrical noise, and resistance to vibration and impact. Programs to control machine operation are typically stored in battery-backed-up or non-volatile memory. A PLC is an example of a hard real time system since output results must be produced in response to input conditions within a limited time, otherwise unintended operation will result. Source and more about PLCs  
Power factor  cosΦ = P / S  The power factor is the ratio of kW to kVA. The closer the power factor approaches its maximum possible value of 1, the greater the benefit to consumer and supplier.
PF = P (kW) / S (kVA)
P = Active power
S = Apparent power


Q Reactive power βλέπε Reactive Power
Qc Calculation of the capacitor nominal power - Qc Qc = (1-P/100) επί Ucn2/Un επί Nc
Nc = Filter-nominal power
Un = Grid voltage
Ucn = selected capacitor nominal voltage (Ucn > Uc)
P = Detuning ratio


Reactive Energy kvar Q=ρίζα3 επί U επί I επί sinφ
Reactive Power  

Reactive power Q (in kvar)
- Single phase (1 phase and neutral): P = V I sin φ
- Single phase (phase to phase): Q = U I sin φ
- Three phase (3 wires or 3 wires + neutral): P = ρίζα3 επί U επί I επί sinφ

Real Energy


P= ρίζα3 επί U επί I επί cosφ

RMS Root Mean Square

RMS = Peak voltage / ρίζα2

A measure of the heating effect of the voltage.
A DC voltage or current displayed on an oscilloscope, you will note the line is straight, voltage or current is present at all times. Now compare this to an AC trace on the scope, you will notice that not only does the value of voltage or current sometimes fall to zero, but also it is not always at it's highest 'peak' value. RMS is a way of representing this time when their is reduced output on the wave. RMS is Peak x 0.707. Rms is only applicable to sinusoidal wave forms.
The RMS value of a set of values (or a continuous-time waveform) is the square root of the arithmetic mean (average) of the squares of the original values (or the square of the function that defines the continuous waveform) more here

 Resonance frequency  fres = 1/(2 επί π επί ρίζα (L επί C) ) The natural frequency, or frequencies, of any physical system or object are the frequencies at which it will vibrate if physically disturbed.

Resonance is the phenomenon that occurs when a physical system is periodically disturbed at the same period of one of its natural frequencies.

Even small amplitude disturbances will then reinforce the energy stored in the system, causing the amplitude of the vibration to increase.

This will continue until the energy loss in the physical system due to non-elastic motion (resistive loss) equals the energy supplied by the disturbing force. In extreme cases, the system will exceed its limits and self-destruct before equilibrium occurs.

The above is true of any physical system
a: Tuning forks disturb the air around the fork, and the air transmits the periodicity of the tuning fork motion to one's ear. In reverse, striking the piano key causes the piano sounding board to vibrate and disturb the surrounding air which reaches the tuning fork and, if the frequency is the same as the natural frequency of the tuning fork, it will start to vibrate in your hand.

As for electromagnetic systems, they are just different physical systems, their energy being stored in the electric and magnetic fields, and their natural frequencies being determined by their physical construction and the relations between that construction and the rates at which their energies may be built up or dissipated.


S Apparent power βλέπε Apparent power 


Uc alculation of the capacitor nominal voltage
(minimum voltage withstand capability) - Uc
Uc = Un επί 100/100-p
Un = Grid voltage
P = Detuning ratio


Vrms Effective Voltage   Vrms = ρίζα2/2 επί Vpk = 0,707 επί Vpk
όπου Vpk = V peak


W Watt

Flow reference terminology - Abbreviations



 Actual cubic feet







 Cubic centimeters per minute


 Standard  Cubic Feet per Hour (SCFH)




 Carbon Steel


  1. or Dia or Diam.

 Diameter, Diameter, Diameter


 Digital to Analogue



 Electromagnetic Interference


 Ethylene Propylene Rubber



 U.S. Food and Drug Administration


 Female National Pipe Thread


 Feet per Minute


 Feet per Second


 Full scale









 Gallons per Minute


 Gallons per Hour



 High –Low



 Inside Diameter




 Pound, Pounds


 Pounds per Square Inch


  1. LPML/min

 Litres per Minute, Litres per Minute





 milli Litres per Minute




 Male National Pipe Thread




 Metres per second





 Nickel Cadmium

  1. NO / NC

 Normally Open / Normally Closed


 National Pipe Thread




 Outside Diameter




 Peak to Peak


 Pounds per Square Inch Absolute


 Pounds per Square Inch Differential


 Pounds per Square Inch Gauge


 Polyvinyl Chloride


 Polyvinyliden Fluoride (kynar)



 Raised Face


 Radio Frequency Interference


 Root Mean Square




 Standard Cubic centimeters per Minute


 Scheduled Number


 Standard Cubic Feet per Hour


 Standard Cubic Feet per Minute


 Standard Litres per Minute


 Standard Litres per Minute

Sq ft

 Square feet


 Saybolt Seconds Universal



 Transistor-Transistor Logic



ISO 9001



Hemexpo Hellenic Marine Equpment Manufactures & Exporters


W.I.M.A Worldwide Industrial & Marine Association


SEVE Greek International Business Association