It is essential to choose the correct cable jacket if you plan to use the extension cord in a demanding environment.
| S |
Hard Service Flexible Cord |
| SJ |
Junior Hard Service Flexible Cord |
| E |
Thermoplastic Elastomer Insulation |
| T |
Thermoplastic Insulation |
| O |
Jacket is Oil Resistant |
| OO |
Jacket & Conductors are Oil Resistant |
| R |
Thermoplastic Rubber Insulation |
| X |
Cross-linked Synthetic Polymer Insulation |
| HH |
High Temperature |
| W |
Moisture Resistant |
| N |
Nylon Jacket |