Fire Resistant Property of Cables

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You are correct that xlpe has a higher temp. rating than pvc, but the bigger difference is that xlpe will not support combustion and thus is favored, (required even), for open cable in ceiling plenums etc. It is commonly used for critical systems like fire alarms. It is also favored for motor power & control wiring.

Sir

XLPE is more preferred than PVC if higher temperature withstand capacity(normal or short time) is under consideration.

But there is an additive namely Ethene Vinyl Acetate, in the PVC which actually resists the deteriorating influences of heat,oil and weather.With this addition in the PVC ,in the outer sheath of the cable ,the same attains the properties of FR (flame retardent).

Regards

ravipra.