Index of designations:
D = dry
H = heater style
J = Junior service (up to 300V, if J is not listed in the wire type, then it is rated to 600V)
N = neoprene
NI = “non-integral”, means inner wire insulation and outer jacket are separate
O = oil resistant compound used in wire jacket
P = parallel
R = round construction
S = Service (also stranded copper wire. Designated for heavy duty insulated portable cord)
T = thermoplastic
V = vacuum (flexible wire initially used for vacuum cleaner applications but now widely used in many applications)
W = weather resistant compound used in wire jacket (outdoor use designation to mean moisture and sunlight resistant)
Alphabetically listed UL power cord wire designations
| DRT |
Dry Round Thermoplastic – Canadian standard (also known as SRDT by UL) |
| HPN |
Heater Parallel Neoprene (Neoprene insulated wires) |
| NI-SPT-1 |
Non-Integral Service Parallel Thermoplastic (-1 indicates 1/64th” insulation thickness) |
| NI-SPT-2 |
Non-Integral Service Parallel Thermoplastic (-2 indicates 2/64th” insulation thickness) |
| SJO |
Service Junior oil resistant jacket |
| SJOO |
Service Junior oil resistant conductor jacket and oil resistant outer jacket |
| SJOW |
Service Junior oil and weather resistant jacket |
| SJOOW |
Service Junior oil resistant conductor jacket and oil and weather resistant outer jacket |
| SJT |
Service Junior Thermoplastic |
| SJTO |
Service Junior Thermoplastic with oil resistant jacket |
| SJTOW |
Service Junior Thermoplastic with oil and weather resistant jacket |
| SJTOOW |
Service Junior Thermoplastic with oil resistant conductor jacket and oil and weather resistant outer jacket |
| SJTW |
Service Junior Thermoplastic with weather resistant jacket |
| SO |
Service with oil resistant jacket |
| SOO |
Service with oil resistant conductor jacket and oil resistant outer jacket |
| SOOW |
Service with oil resistant jacket for conductors and outer jacket and weather resistant outer jacket |
| SOW |
Service with oil and weather resistant jacket |
| SPT-1 |
Service Parallel Thermoplastic (-1 indicates 1/64th” insulation thickness) |
| SPT-2 |
Service Parallel Thermoplastic (-2 indicates 2/64th” insulation thickness) |
| SPT-3 |
Service Parallel Thermoplastic (-3 indicates 3/64th” insulation thickness) |
| SRDT |
Service Round Dry Thermoplastic – UL designation (also known as DRT in Canada) |
| ST |
Service Thermoplastic |
| STO |
Service Thermoplastic with oil resistant jacket |
| STOW |
Service Thermoplastic with oil and weather resistant jacket |
| STOOW |
Service Thermoplastic with oil resistant conductor jacket and oil and weather resistant outer jacket |
| STW |
Service Thermoplastic with weather resistant jacket |
| SVT |
Service Vacuum Thermoplastic |
|
