![]() ![]() The content we provide is meant to inform you and help support the proper selection and use of conductor cables. We encourage you to look over article 630 for yourself since it’s only about two and a half pages in the 2011 edition. In particular, article 630 gives additional requirements when sizing welding cable for resistance and arc welders. Resistance and arc welders are considered “Special Equipment” and covered in chapter 6 of the NEC. Note for Electric Welders: Flexible cables designed specifically for use with electric welders are called welding cables. can bend, stretch, rolled into coils, etc.). The key difference is whether your cables will be fastened in place or if they need to be flexible (i.e. There are plenty of applications where you need flexible cables for permanent, long-term power supply. In fact, fixed and flexible cables can be used for either permanent or temporary wiring applications. ![]() long-term) applications and that flexible or portable cables are only used for temporary wiring applications. Is fixed cable only used for permanent wiring and flexible cable only for temporary, non-permanent wiring? It is more accurate to say that flexible cable is used for portable power supply because "portable" implies the cable will be moved around and, thus, need to be flexible.Ī common misconception is that fixed cables are only used for permanent wiring (i.e. Another common name for flexible cables is portable cords, because portable machines, like welders or stage lighting equipment, often require flexible wiring. Used in applications where flexible cables with a higher tensile strength are needed or preferred (e.g. Used in non-moving installations where the cables are fixed in place. Two general groups of conductor cables are used in the U.S. Please refer to our article on cable types for more information about letter designations. The extra hard usage rating applies if the S is by itself (no J, P, or V afterwards), which means the cable is rated for 600V and designed to withstand physical damage such as cuts, impacts, and abrasions. The National Electrical Code (NEC) uses various letters to provide information about the insulation, including temperature ratings, construction material, and intended uses. Similarly, SJ cable rated for 300V "junior hard service" has been replaced by SJOW. SO cable has been largely replaced by SOOW cable, which provides better protection against oil and moisture. ![]() SO cable ranges in size from 18 AWG to 2 AWG. As a multi-conductor, SO cable comes with two or more individually insulated conductors all bound tightly together by an outer insulation jacket. SO cable is a type of flexible multi-conductor cable (or portable cord) rated for 600V "extra hard usage" and made with an oil resistant outer jacket. ![]()
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