Cable Abbreviation


A - Asbestos.

AA - Asbestos-insulated, asbestos or glass braid wiring. In raceways, only for leads to or within apparatus. Limited to 300V, 200°C. Dry locations only.

AAR - Association of American Railroads.

AB - High-voltage butyl cable.

ABC - Armored bushed cable. BX-armored building wire with polyvinyl chloride insulation,
600V.

ABP - Butyl-polyethylene high voltage cable,
75°C.

AC - Branch circuit and feeder cables with flexible metal tape armor.

A.C. or A-C - Abbreviation for alternating current.

ACA - Synthetic tapes, felted asbestos wire with  glazed  cotton  or  glass  braid,  1000V,
90°C.

ACR - Cable with corona-resisting insulation.

ACU - Armored cable with latex rubber- insulated conductors.

ACV - Varnished cambric insulation, polyvinyl chloride, interlocked armor, 5000V.

AEIC  -  Association  of  Edison  Illuminating
Companies.

AF - Asbestos-insulated, single solid or stranded conductor fixture wire. Impregnated with moisture-resisting, flame-retarding compound.  With  or  without  braid,  300V,
150°C.

AFC - Two or three individually braided (with cotton or rayon) AF conductors twisted together   without   overall   covering,   300V,
150°C.

AFPD - Two AF conductors twisted together with cotton or asbestos braid overall, 300V,
150°C.

AFPO  -  Two  AF  conductors,  without individual braid, laid parallel and braided overall, 300V, 150°C.


AFS - Two or three-conductor, heat-resistant cord with impregnated-asbestos insulation and rubber jacket. For use in damp locations,
300V.

AFSJ - Same as AFS but for lighter (junior)
service, 300V.

AGS - Solid, stranded or flexible nickel conductor, silicone-impregnated asbestos insulation with glass braid. For appliance wiring, 300V, 200°C.

Al - Appliance wire same as type A, but moisture-resistant as well as heat and flame- resistant. Dry locations only. Without braid,
300V, 125°C.

AIA - Felted asbestos fibers with outer asbestos or glass braid. Impregnated with heat,  flame  and  moisture-resistant compound. Dry locations only, 600V, 125°C.

AIEE - American Institute of Electrical Engineers. Now known as Institute of Electrical and Electronics Engineers.

AL or ALS - Used as a suffix to denote a wire or cable having an aluminum sheath.

AN - Aircraft wire.
ASA - American Standards Association.

ASE - Service entrance cable, above ground use. Some constructions suitable for underground use. Flame-retardant, moisture- resistant, abuse-resistant covering.

ASTM  -  American Society for  Testing and
Materials.

AV or AVC - Asbestos and varnished- cambric insulated power and control cables.

AVA - Impregnated asbestos and varnished- cambric insulated, with asbestos or glass braid, 600V, 110°C.

AVB - Same as AVA, but with cotton braid,
600V, 90°C.

AVL - Same as AVA, except lead sheath replaces asbestos or glass braid, 600V-110°,
5000V-100°C.

AVPD - Two- or three-conductor heat and moisture-resistant    cord,     asbestos     and


varnished-cambric insulation with asbestos braid. Round construction, flame-retarding, moisture-resisting finish. For use in damp locations, 600V, 110°C.

AVPO - Same as AVPD, but two-conductor flat construction.

AWG - American Wire Gauge. Based on the circular mil system. 1 mil equals 0.001 inch.

AWM - Appliance wiring material.

B - Same as AVC. Motor lead wire.

BC - Bare copper or bell cord.

BDC - Plastic busdrop cable.

B&S - Stands for Brown & Sharpe Gauge, a wire diameter standard that is the same as AWG.

BT - Bus tie.

BTU - British thermal unit.

BW - Braided wire armor. Basket weave.

BWG - Birmingham Wire Gauge.

BX - Armored building wire, 600V.

C - Lamp cord, two or more conductors twisted together. Rubber insulation, cotton braid. For pendant or portable use in dry places. No overall covering, 300V to 600V,
60°C.

CAC - Flexible copper, synthetic tapes, felted asbestos and lacquered braid, 1000V, 125°C.

CB - Rubber-insulated brewery cord, with weatherproof braid on each conductor. Twisted, no overall covering.

CBO - Neoprene-insulated brewery cord for use in damp locations.

CCW - Continuous Corrugated and Welded. A type of armored cable featuring a metallic sheath covering welded together over the cable core, then corrugated for extra mechanical strength.

CF - Fixture wire, heat-resistant, with flame- retardant, moisture-resistant, impregnated cotton insulation. With or without plain or fancy cotton or rayon braid, 300V, 90°C.


CFC - Two or three CF type wires twisted together without overall covering. Color- coded, 300V, 90°C.

CFPD - Two or three CF type wires twisted together   with   overall   braid.   Color-coded,
300V, 90°C.

CFPO - Two CF type wires laid parallel with overall braid. Color-coded, 300V, 90°C.

CM - Circular mil. Equal to the area of a circle
1/1000 of an inch in diameter.

CPE - Chlorinated Polyethylene.

CS - Used as a suffix to denote wire or cable having a copper sheath.

CSA - Canadian Standards Association.

CSPE - Insulating and jacketing compound based upon chlorosulfonated polyethylene. Also known as Hypalon®  (DuPont registered
trademark).

CT - Cable Tray.

CV   -   Abbreviation   for   continuous vulcanization.

CX  -  Two-conductor,  #18  AWG,  plastic- insulated, twisted Christmas tree cord, 300V.

CXT  -  Two-conductor,  #18  AWG,  plastic- insulated, twisted Christmas tree wire, 300V.

D - Used as a suffix to indicate a twin wire with two insulated conductors laid parallel under an outer non-metallic covering.

DLO - Diesel locomotive.

DR - Rubber range & dryer cord (CSA). DRO - Neoprene range & dryer cord (CSA). DRT - Plastic range & dryer cord (CSA).
E - Enamel.

E   -   Elevator  lighting  and  control  cable. Rubber insulation, three overall braids, outer one flame-retardant and moisture-resistant. May have steel supporting strand in center,
300V.

EHV - Extra High Voltage.

EIA - Electronic Industries Association.


EMF - Electromotive force or current.

EO - Elevator lighting and control cable. Rubber insulation, cotton braid, neoprene jacket. May have steel supporting strand in center, 300V.

EPCV   -   Ethylene   Propylene   Continuous
Vulcanization.

EP, EPR, EPM, EPDM - Designations for synthetic rubber based upon ethylene- propylene hydrocarbon.

ET - Elevator lighting and control cable. Polyvinyl chloride insulation, three braids, flame-retardant and moisture-retardant finish. May have steel supporting strand in center,
300V.

ETP - Electrolytic tough pitch copper.

F - Flat band metallic armor.

FCC - Flexible control cable or flat conductor cable.

FEP - Fluorinated ethylene propylene insulated wire.

FEPB - Fluorinated ethylene propylene insulated wire with glass or asbestos braid.

FF-1 - Fixture wire, flexible, rubber insulated, single conductor, 300V, 60°C.

FF-2 - Same as FF-1, but with 600V rating.

FFH-1 - Heat resistant fixture wire, otherwise same as FF-1, 300V.

FFH-2  -  Same  as  FFH-1,  but  with  600V
rating.

FRMR - Flame-retarding, moisture-resisting finish.

FX - Single rubber-insulated Christmas tree wire with outer braid, 125V, 60°C.

FXT - Single plastic-insulated Christmas tree wire, 125V, 60°C.

G - Rubber-insulated, neoprene jacketed, portable power cable with two to five #8 AWG or larger conductors with ground wires, 95°C.

GND or GRD - Abbreviations for ground.

GOR - Gasoline and oil-resistant wire.

GTO - Gas tube sign and oil-burner ignition cable, 5000V - 15,000V.

H - Shielded power cable. Multi-conductor cables have paper or varnish-cambric insulation applied directly over individual conductors. Spiraled metallic shielding tape over  insulation  with  overall  protective covering.

HC - Two or more conductor heater cord, asbestos and rubber insulation with cotton braid   over   each   conductor.  Twisted,   no overall covering.

HDPE - High-density polyethylene.

HF  -  Polyethylene-insulated  radio  hookup wire with or without braid.

HMWPE     -     High     Molecular     Weight
Polyethylene.

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/NBR.

HPN - Two-conductor, neoprene-insulated heater cord. Parallel construction. For use in damp locations.

HS - Rubber and asbestos-insulated heater cord. Cotton serve and rubber-jacketed overall. For use in damp locations #14 or #12 conductors. Also made with neoprene insulated inners and asbestos.

HSJ - Same as type HS but with #18 or #16 conductors and differing thickness of jacket.

HSJO   -   Same  as   type   HSJ,   but   with neoprene jacket.

HSO - Neoprene jacketed heater cord.

HV - High voltage, generally used to describe a cable with an operating capability of over
600 volts.

HW - Radio hookup wire with polyvinyl insulation. With or without nylon jacket, braid or shield, 2500V.

I - Interlocked armor of aluminum, bronze or steel.


IAC - Interlocked Armored Cable, characterized by a helically would metal tape which overlaps the cable core on successive turns to form a strong, flexible armor.

IACS    -    International   Annealed   Copper
Standard.

ICEA     -     Insulated     Cable     Engineers
Association.

ID - Inside Diameter.

IEC      -      International      Electrotechnical
Commission.

IEEE - Institute of Electrical and Electronics
Engineers, formally known as the AIEE.

IGS - Denotes integrated gas spacer cable, one or more conductors each individually insulated and enclosed in a loose fitting non- metallic flexible conduit.

IPCEA -  Insulated Power Cable Engineers
Association.

IPE - Irradiated polyethylene tape.

ISO     -     International     Organization     for
Standardization.

J - Asphalted jute, non-metallic armor.

K - Constant used to denote insulation resistance.

KCMIL - Thousands of circular mils (replaces
MCM).

L - Denoted lead sheath.

LESCW - Low energy safety circuit wire.

LDPE, LLDPE - Designation for Low Density Polyethylene or Linear Low Density Polyethylene.

LV - Low voltage, generally used to describe a  cable  with  an  operating capacity of  600 volts or less.

LW - Radio hookup wire with polyvinyl insulation. With or without nylon jacket, braid, or shielding braid, 300V.

M - Suffix indicating two or more insulated, twisted conductors under an outer, non- metallic covering.


MC - Denotes cable with interlocking metal tape or corrugated tube enclosure.

MCM - Denotes a thousand circular mils.

MDPE - Medium Density Polyethylene.

Mfd - Abbreviation for microfarad, one millionth of a farad, the unit of capacitance.

MHD - Medium hard drawn copper wire.

Mho - Unit of conductance. Reciprocal of an ohm. One ampere of current passing through a material under a potential difference of one volt provides one ohm of conductance.

MI - One or more conductors insulated with a highly compressed refractory minerals and enclosed   in   a   liquid-tight  and   gas-tight metallic tube sheathing.

MIL - Abbreviation for military as inn military specifications for wire.

ML - Single-conductor, paper-lead cables twisted  together  without  overall  covering. Type A-AVC mine locomotive cable; Type B- motor lead wire.

MM - Mining machine cable.

MPF - Mine power feeder, 5-8-15KV.

MP-GC - Mine power, ground check wire.

MRFR - Moisture-resistant, flame-retardant finish.

MTW - Thermoplastic-insulated machine tool wire, 90°C to 105°C, 600V.

MV - Medium voltage 5-35KV.

MW - Radio hookup wire with polyvinyl insulation and plain or nylon jacket, or braid, or shield, 1000V.

MS - Military Standard.

MYD - Marina Yard and Dock Cable.

NBC - (Same properties as EZC) A blend of acrylonitrile-butadiene rubber and polyvinyl chloride (PVC). Used for jacketing.

NBR/PVC - A blend of nitrile rubber and polyvinyl chloride, recommended for oil and ozone resistant jacketing of flexible cord and fixture   wires,   cables   and   ignition   wires.


NBR/PVC is said to offer toughness, smoothness, flame resistance, flexibility and resistance to abrasion and heat deformation, and provides outstanding service when exposed to weather, light, fuel, oil, or ozone.

NBS - New British Standard.

NEC - Abbreviation for National Electrical Code, which covers the use of wire and cable in many applications.

NEMA  -  National  Electrical  Manufacturers
Association.

NFPA - National Fire Protection Association.

NM - Non-metallic sheathed cable, braid or plastic covered. For dry use, 60°C.

NMC - non-metallic sheathed cable, plastic or neoprene covered. Wet or dry use, 60°C.

NP - Abbreviation for nickel plate.

NRHW - Moisture- and heat-resistant rubber insulation with neoprene jacket for use in ducts. Dry and wet locations, 600V, 75°C. Also RHWN.

OD - Outside diameter.

Ohm - Unit of electrical resistance. Resistance of a circuit in which a potential difference of one volt produces a current of one ampere.

OSHA - Occupational Safety and Health Act of 1970 administered by U.S. Department of Labor which establishes standards and safety requirements for all businesses.

P - Two or more rubber-insulated stranded conductors with cotton braid over each. Reinforced with overall covering of cotton braid over rubber filler. For pendant or portable use in damp locations, 300V-600V.

PCG  -  Portable  mine  cable  with  power, control and ground conductors.

PD - Rubber-insulated stranded conductors with cotton braid over each. Conductors twisted with braid overall. Light duty, dry locations on appliances, 300V.

PFA - Perfluoroalkoxy insulated wire, 90°C
dry and damp locations.


PFAH - Same as Type PFA except nickel or nickel-clad copper conductor, dry locations only, °C.

PG - Portable mine cables having power and ground conductors, 600V.

PL - Two rubber-insulated, parallel-laid, lamp cords with overall cotton or rayon braid. For light duty on small appliances in dry locations,
300V.

PLSJ - All-rubber, parallel-jacketed, two conductor, light duty cord for pendant or portable use in damp locations, 300V.

PLT - Same as PLSJ except thermoplastic insulation.

PNA, PNR, PNW - Polyethylene-insulated control cables with nylon sheath or individual conductors. Cabled tape and polyvinyl chloride jacket. Dry or wet locations, 600V,
75°C.

PO - Two stranded copper conductors with separator and code rubber insulation and cotton braid over each. Laid parallel with cotton or rayon braid overall. For use in dry locations on small appliances, 300V-600V.

POSJ - All-rubber, parallel, light duty ripcord for use on lamps and small appliances, 300V,
60°C.

POSJX   -   All-rubber,  parallel,   #20   AWG ripcord for use on lamps, clocks and Christmas trees, 125V.

POT - Thermoplastic, parallel, light duty ripcord, 300V, 60°C to 105°C.

POXT -  Same as POT, but #20 AWG for clock and Christmas tree use, 125V.

PS - Thermostat cable with solid conductors, individual rubber insulation and cotton braid. Twisted, rubber jacket and cotton braid overall.

PTFE - Polytetrafluoroethylene.

PVC - Denotes Polyvinyl Chloride.

PW  -  Moisture-proof,  reinforced,  portable cord with two or more rubber-insulated conductors with individual cotton braid. Moisture-resistant cotton braid finish over rubber jacket, 300V-600V.

R - Code for rubber-insulated building wire,
600V, 60°C.

RD - Rubber-insulated twin conductors, fibrous covered.

RDL - Rubber-insulated twin conductors, lead covered.

RF - Fixture wire, code or latex rubber- insulation and braid over solid or stranded conductor, 60°C.

RFH  -  Same  as  RF,  but  rubber  or  latex rubber insulation heat-resistant, 75°C.

RH  -  Rubber-insulated,  heat-resistant building wire, dry and damp locations, 75°C.

RHD  -   Rubber-insulated,  twin  conductor, heat-resistant, fibrous covered wire.

RHDL - Same as RHD, except lead instead of fibrous covering.

RHH - Rubber-insulated, heat-resistant building wire, dry and damp locations, 90°C.

RHL - Same as RHH, but with lead sheath overall.

RHM - Rubber-insulated multiple conductors, heat-resistant and overall fibrous covered.

RHML - Same as RHM, but with lead cover overall.

RH/RW  -  Rubber-insulated,  heat  and moisture  resistant  building  wire,  75°C  dry,
60°C wet.

RHW - Rubber-insulated building wire, heat and moisture resistant, 75°C dry or wet.

RHW-2 - Same as RHW except approved for
90°C, dry and wet locations.

RJ  -   Rubber-insulated  and  jute  covered cable.

RJFJ - Rubber-insulated cable with flat band armor.

RJIJ - Rubber-insulated cable with interlock armor.

RL - Rubber-insulated cable with lead sheath.


RLJFJ - Rubber-insulated cable with lead, jute,  flat  band armor and overall jute covering.

RLJWJ - Rubber-insulated cable with lead, jute, steel wire armor and overall jute covering.

RM - Rubber-insulated multiple conductors with fibrous covering.

RML - Same as RM, but lead instead of fibrous covering.

RP -  Performance grade rubber insulation,
60°C.

RR - Rubber insulation, neoprene jacket. See type USE.

RS - Integral rubber insulation and jacket on single conductor cables.

RU  -  Rubber-insulated, latex  building wire,
60°C.

RUH - Same as RU, but heat-resistant, 75°C.
RUW - Same as RU, but moisture-resistant,
60°C.

RW - Rubber-insulated building wire, moisture-resistant, 60°C.

RWS - Same as RW, but synthetic rubber.

S - Heavy duty, rubber-insulated portable cord. Stranded copper conductors with separator  and  individual  rubber  insulation. Two or more color-coded conductors cables with filler, wrapped with separator and rubber jacketed overall, 600V.

SA - Silicone rubber insulation, asbestos or glass  braid,  for  use  in  dry  locations. Maximum operating temperatures for special applications, 125°C.

SAE - Society of Automotive Engineers.

SB - Slow burning wire. Three cotton braids, impregnated, 90°C.

SD - Service drop cable. Two code-rubber- insulated conductors, tape, laid parallel with neutral conductor concentric thereover. Tape and braid overall. Also round construction.

SDN - Small diameter multi-conductor control cable with neoprene jacket and nylon sheath over polyethylene insulation.


SDT/TC - Thermoplastic 90°C tray cable.

SE - Above ground service entrance cable, not protected against mechanical abuse. Flame-retardant, moisture-resistant covering. Overall neoprene sheath, 60°C-75°C.

SEA - Service entrance cable, steel-armored under outer braid, one or two rubber- insulated conductors with neutral conductor served  concentrically,  moisture-resistant tape, weatherproof-braid finish, 300V, 75°C.

SEU - Same as SEA, but not armored.

SEW, SEWF - Silicone Rubber insulated equipment wire (CSA).

SF - Silicone rubber insulated fixture wire, solid or 7 strand conductor, 200°C.

SFF - Same as SF, except flexible stranding,
150°C.

SG - Same as SW, except with ground wires
(CSA).

SGO - Same as SWO, except with ground wires (CSA).

SH-A - Portable mine power cable, three or four individually shielded conductors, 5000V.

SH-B - Same as SH-A, except shield is overall.

SH-C - Same as SH-B but with grounding conductors.

SH-D - Same as SH-A, but with grounding conductors.

SHFS - Polyvinyl-insulated with felted- asbestos, flame-proof cotton or rayon braid. Navy switchboard wire, 600V.

SIS - Indicates single conductor having synthetic thermosetting insulation of heat- resistant, moisture-resistant, flame-retarding grade. Also made with chemically cross- linked polyethylene insulation. Used for switchboard wiring only, 90°C.

SJ - Junior hard service, rubber-insulated pendant or portable cord. Same construction as Type S, but 300V. Jacket thickness different.


SJO - Same as SJ, but neoprene, oil- resistant compound outer jacket. Can also be made "water-resistant", 300V, 60°C.

SJT - Junior hard service thermoplastic or rubber-insulated conductors with overall thermoplastic jacket, 300V, 60°C to 105°C.

SJTO - Same as SJT but oil-resistant thermoplastic outer jacket, 60°C.

SL - Single-conductor paper-lead cables twisted together, without overall covering (same as ML).

SNM - Denotes shielded non-metallic sheathed cable, assembly of two or more insulated conductors in an extruded core of moisture- and flame-resistant non-metallic material, covered with an overlapping spiral metal tape and wire shield and jacketed with a moisture-, flame-, oil-, corrosion-, fungus-, and sunlight-resistant non-metallic material.

SO - Hard service cord, same construction as
Type S except oil-resistant neoprene jacket,
600V, 60°C to 90°C.

SOW - Water resistant neoprene jacketed portable cord (CSA).

SP - Silver plate.

SP-1 - All rubber, parallel-jacketed, two- conductor light duty cord for pendant or portable use in damp locations, 300V.

SP-2 - Same as SP-1, but heavier construction, with or without third conductor for grounding purposes, 300V.

SP-3 - Same as SP-2, but heavier construction for refrigerators or room air conditioners, 300V.

SPC - Submersible pump cable. Also, silver- plated copper.

SPT-1 - Same as SP-1, except all- thermoplastic, with or without third conductor for grounding purposes, 300V.

SPT-1 - Same as SP-1, except all- thermoplastic, with or without third conductor for grounding purposes, 300V.

SPT-3 - Same as SP-3, except all- thermoplastic, with or without third conductor for grounding purposes, 300V.




SR  -  Silicone  rubber  control  cable,  600V,
125°C.

SR-AW - Flexible, nickel-plated copper conductor, silicone rubber insulation, glass braid, 600V, 200°C.

SR-C  -   Solid  copper  conductor,  silicone rubber insulation, glass braid, 600V, 125°C.

SRD - Portable range or dryer cable. Three or four rubber-insulated conductors with rubber or neoprene jacket, flat or round construction, 300V, 60°C.

SRDT - Same as SRD, except all- thermoplastic with a maximum temperature of 90°C.

SR-H - Silicone rubber-insulated, asbestos braid, 500V, 125°C.

ST - Hard service cord, jacketed, same as
Type S, except all-plastic construction, 600V,
60°C to 105°C.

STO - Same as ST, but with oil-resistant thermoplastic outer jacket, 600V, 60°C.

SV - Vacuum cleaner cord, two- or three- conductor, rubber-insulated. Overall rubber jacket. For light duty in damp locations, 300V,
60°C.

SVO - Same as SV except neoprene jacket,
300V, 60°C.

SVT - Same as SV except all-plastic construction. With or without third conductor for grounding purposes only, 300V, 60°C to
90°C.

SVTO - Same as SVT except with oil- resistant thermoplastic jacket, 60°C.

SW - Rubber jacketed power supply cable,
#8 AWG to #2 AWG, 600V (CSA).

SWO - Same as SW except neoprene jacketed (CSA).
SWT - Plastic jacketed power supply cable,
#8 AWG to #@ AWG, 600V (CSA).

T - Thermoplastic vinyl, building wire, 60°C.

TA - Switchboard wire, thermoplastic and asbestos insulation, 90°C.


TAA - Flexible nickel or nickel-clad copper, Teflon tape, felted asbestos, asbestos braid,
200°C.

TBS - Switchboard wire, thermoplastic insulation,  flame-proof  cotton  braid,  600V,
90°C.

TBWP - Three cotton braids, weather-proof saturated. No voltage rating.

TC - Tray cable art 340 NEC.

TEW - Canadian Standards Association type appliance wires. Solid or stranded single conductor, plastic-insulated, 600V, 105°C.

TF - Fixture wire, thermoplastic-covered solid or 7 strands, 60°C.

TFE  -  Nickel  or  nickel-clad  copper conductors, tetrafluoroethylene insulated, dry locations only, 250°C.

TFF -  Same as  TF, but flexible stranding,
60°C.

TFFN - Same as TFF, but with nylon sheath.

TG - Flexible nickel or nickel-clad copper conductor, Teflon tape, glass braid, 200°C.

TGS  -  Solid  or  flexible copper, nickel-clad iron or copper, or nickel conductor. Teflon tape, silicone glass braid, 600V, 250°C.

THHN - Nylon jacketed building wire, 600V, dry and damp locations, 90°C.

THW - Thermoplastic vinyl insulated building wire. Flame-retardant, moisture- and heat- resistant, 75°C. Dry and wet locations.

THW-2 - Same as THW except approved for
90°C, dry and wet locations.

THWN - Same as THW, but with nylon jacket overall, 75°C.

THWN-2 - Same as THWN except approved for 90°C, dry and wet locations.

TP - Parallel tinsel cord. All-rubber insulation and jacket over two extremely flexible conductors.  Light  duty,  attached  to appliances of 50W or less. For use in damp locations in lengths of eight feet or less.

TPO - Same construction as Type PO, but with extra flexible tinsel conductors, 125V.



TPT - Same as TP, but all-thermoplastic insulation and jacket, 125V.

TRXLPE   -   Tree   Retardant   Cross-Linked
Polyethylene.

TS - Two- or three-conductor rubber- insulated and jacketed tinsel cord. Light duty, attached to an appliance of 50W or less. Fir use in damp places in lengths of eight feet or less.

TSO - Same as Type TS, but with neoprene jacket, 125V.

TST - Same as Type TS, but all- thermoplastic insulation and jacket.

TT - Polyvinyl chloride insulation and sheath, aerial and duct.

TW - Thermoplastic vinyl-jacketed building wire, moisture-resistant, 60°C.

UD - Underground Distribution.

UD-P - Underground Distribution - Primary. UD-S   -   Underground   Distribution   - Secondary.

UF - Thermoplastic underground feeder and branch circuit cables.

UHF - Ultra High Frequency.

UL - Underwriters Laboratories, Inc. A company supported by several underwriters for the purpose of establishing safety standards on types of equipment or components.

URC - Weatherproof wire.

URD - Underground Residential Distribution.

USE - Underground service entrance cable, rubber-insulated, neoprene-jacketed.

USE-2 - Same as USE except approved for
90°C, dry and wet locations.

V - Varnished-cambric insulation, with fibrous covering.

VCB - Varnished-cambric insulation, cotton braid, flame-retarding, moisture-resisting finish.


VCL - Varnished-cambric insulation, lead- covered cable. Ends must be hermetically sealed.

VD - Indicates a twin wire having two type V conductors   laid   parallel  under   an   outer fibrous covering.

VG - Varnished-glass tape over a flexible copper conductor. Varnished-glass or nylon braid, 600V or 3000V, 130°C.

VHF - Very High Frequency.

VM - Indicates a cable having two or more Type V conductors twisted together under an outer fibrous covering.

VT - Denotes varnished cloth-thermoplastic insulated   cables   enclosed  in   a   metallic sheath.

VWI   -   Underwriters  Laboratories   vertical flame  test  applicable  to  single  conductor wires and cables.

W - Heavy-duty portable power cable, one to six conductors, without grounds, 600V.

WP - Weatherproof construction, two or three impregnated cotton braids, 80°C.

X - Two FX wires twisted together, color- coded, 125V, 60°C.

XHHW - High temperature (90°C) thermosetting jacketed small diameter building wire.

XLPE - Cross-Linked Polyethylene.

XT - Two FXT wires twisted together, color- coded, 125V, 60°C.