Technical Articles

UL Standards for Wires and Cables



44 Thermoset-Insulated Wires & Cables (SIS XHHW RHW)


62 Flexible Cords & Cables (SPT SJT)


66 Fixture Wire (SF1 SF2)


83 Thermoplastic-Insulated Wires & Cables (THHW)


758 Standard for Appliance Wiring Material (UL Style Numbers)


1063 Standard for Machine Tool Wire & Cables (MTW)


1426 Electrical Cable for Boats (BC-5W2)


1581 Reference Standard for Electrical Wires, Cables, and Flexible Cords (All wires)


2276 Recreational Vehicle Cable (RV Cable)


2556 Wire & Cable Test Methods (All wires) (Includes VW-1 test)


Any standard may contain reference to other standards. Many tests and specifications are common to multiple wire types and rather than repeat descriptions or procedures UL includes them in just one standard and references this from other standards.


This information is only meant for general description purposes. Underwriters Laboratories should be contacted for a complete understanding of the standards and the products they cover. A copy of the standards is available from Underwriters Laboratories and should be referenced to determine relevance to your specific needs.



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