SJO is the same as SJ but with an oil-resistant compound outer jacket, rated 300 volts at 60 degrees C, and can also be made water-resistant.
SJO, described in relation to SJ, is the same junior service cord but with an oil-resistant compound used for the outer jacket. Rated at 300 volts and generally for 60 degrees C, it carries the O suffix to indicate the oil-resistant jacket, and it can additionally be made water-resistant for damp environments. The rubber-insulated conductors remain flexible for portable use.
By adding an oil-resistant jacket to the SJ construction, SJO extends the cord's suitability to environments where oils and greases are present, protecting it from the degradation that would affect an ordinary jacket. This makes it well suited to industrial portable power around machinery.
In commercial and industrial settings, oil-resistant junior service cords like SJO supply portable power where oils and dampness are concerns. Recognizing the designation and its suffix is part of identifying cord suited to the environment.
Because adding an oil-resistant jacket extends the SJ construction to environments where oils and greases are present, SJO is well suited to industrial portable power around machinery, protecting the cord from the degradation that would affect an ordinary jacket.
At Windy City Wire, the focus on quality low-voltage cable and cord includes oil-resistant portable cord types like SJO. Supplying cord with appropriate jackets and ratings helps customers match products to portable power needs in demanding commercial and industrial environments.
SJO (oil-resistant jacket, 300 volt, 60 degrees C)
UL (Underwriters Laboratories), which lists flexible cord types