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SJO-What? How to Read Your Power Cord Wire Markings

By: Signal and Power Delivery Systems

Power Cord Wire Markings Diagram

For further details about the markings definitions and safety requirements for America, you can review the following agencies and electrical and safety standards:

NEC (National Electrical Code) NFPA 70A 70)

UL Standard for Safety for Cord Sets and Power-Supply Cords, UL 817

UL Standard for Safety for Flexible Cords and Cables, UL 62

UL Standard for Safety for Electrical Wires, Cables, and Flexible Cords, UL 1581

UL Standard for Safety for Attachment Plugs and Receptacles, UL 498

*The actual marking looks more like this: YUNG LI (UL) E241374 SJT 3/C 18AWG(0.824mm2) 105 300V VW-1 CSA 177323 SJT 3/C 18AWG(0.824mm2) 105 300V FT2 With the CSA portion indicating that the power cord complies with Canada’s construction and safety requirements.