SJ is a junior hard-service, rubber-insulated pendant or portable cord with the same construction as Type S, but rated 300 volts with a different jacket thickness.
SJ, in this hard-service sense, is a junior hard-service cord of the same general construction as Type S but rated at 300 volts rather than 600. Used as a pendant or portable cord, it features rubber-insulated conductors and a rubber jacket, with the jacket thickness adjusted for the lower voltage rating. The junior designation reflects its lighter duty relative to the senior service Type S.
As a hard-service cord, SJ is built to withstand the flexing, handling, and mechanical stress of portable and pendant applications, where it supplies power to tools, equipment, and fixtures. Its rubber construction provides the flexibility and durability these uses require.
In commercial and industrial settings, junior hard-service cords like SJ provide flexible, durable portable power at 300 volts. Recognizing the designation and its relationship to Type S is part of identifying cord suited to the application.
Because it is a hard-service cord, SJ withstands the flexing, handling, and mechanical stress of portable and pendant applications, supplying power to tools, equipment, and fixtures with the flexibility and durability its rubber construction provides at 300 volts.
At Windy City Wire, the focus on quality low-voltage cable and cord includes hard-service portable cord types like SJ. Supplying cord with appropriate construction and ratings helps customers match products to portable and pendant power needs in commercial and industrial settings.
SJ (junior hard-service cord, 300 volt)
UL (Underwriters Laboratories), which lists flexible cord types