HEAT-SHRINKABLE SPLICING MATERIALS FOR CLASS 1E WIRE AND CABLE SYSTEMS IN NUCLEAR POWER GENERATING STATIONS.

This report describes the shapes of heat-shrinkable splicing materials (cable sleeve and breakout, and round end cap) made of polyolefine resin, their application to cable splicing, and the properties of the materials as well as of the splice using them. Particlarly, the report features introduction of their properites as determined by tests under the same conditions as used in Japan in qualifying tests on wires and cables for nuclear power generating station. The heat-shrinkable splicing materials proved to be equal in properties to flame-retardant cables for nuclear power plants when tested for oxygen index and subjected to a vertical flame test on 'insulated wire' and a vertical tray flame test on the cable splice. It was also confired that Class 1E cable using these splicing materials could stand the most rigorous environmental test in Japan. Therefore they can be used for splicing Class 1E wires and cables and the splice formed with them can be regarded as Class 1E specified in IEEE Std. 383.