SIS is a switchboard wire insulated with cross-linked polyolefin, a heat-resistant wire used to wire switchboards and control apparatus.
SIS designates a switchboard wire insulated with cross-linked polyolefin, often abbreviated XLP. Cross-linking the polyolefin improves its heat resistance and mechanical properties compared with the uncross-linked material, making SIS suited to the elevated temperatures and demands of switchboards and control equipment. Switchboard wire connects the components within these electrical assemblies.
Because switchboards and control apparatus can operate at elevated temperatures and require dependable wiring, the heat-resistant cross-linked insulation of SIS supports reliable performance. The single-conductor wire is built for the internal wiring of these assemblies.
In commercial and industrial electrical systems, switchboard wire like SIS carries connections within switchboards and control panels. Recognizing the designation is part of identifying wire suited to these applications.
Because switchboards and control apparatus can operate at elevated temperatures and require dependable wiring, the heat-resistant cross-linked insulation of SIS supports reliable performance, with the single-conductor wire built for the internal wiring of these assemblies.
Recognizing how cross-linked polyolefin insulation provides heat resistance helps in identifying wire like SIS suited to the internal wiring of switchboards and control apparatus.
At Windy City Wire, an understanding of specialized building and switchboard wire, including types like SIS, supports the selection of wire for demanding applications. Recognizing how cross-linked polyolefin insulation provides heat resistance helps customers match products to switchboard and control wiring needs.
SIS (cross-linked polyolefin switchboard wire)
NEC (National Electrical Code), which defines switchboard wire types