Extension Cord Codes

What does the writing on an extension cord mean?


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The Jackets of extension cords are covered with imprints or embossing indicating how and where they can appropriately be used.

It is essential to choose the correct cable jacket if you plan to use the extension cord in a demanding environment.

Here's the key to some of that code as outlined in the National Electrical Code.

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

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