D. Castle asks about whether cables having polystyrene insulation can safely be run long term inside PVC conduit. His question has been answered by SELECT. (Theme – Cables, Wiring & Wiring Accessories):
Question: PVC cables that are running through, or are in contact with, polystyrene insulation need to be run in conduit - can this be PVC conduit?
Answer: Expanded polystyrene is known to have an effect on thermoplastic insulated cables, caused by the softening of the insulation by certain chemicals incorporated in it. The same sort of degradation is possible with other thermoplastic materials.
Checks however would have to be made with the manufacturer concerned.
Experience of this problem suggest that the cables should remain in an acceptable condition if not disturbed.
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