Outersheath

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The PVC covering over the armouring in case of armoured cables and over the innersheath in case of unarmoured cables is called outersheath. I.S. 1554 & I.S. 7098 specifies nominal and minimum thicknesses of outer sheath for unarmoured cables and only minimum thickness of outer sheath for armoured cables.

It permits the following types of outer sheath PVC compounds type ST1 PVC compound as per IS-5831, which is suitable for 70°C continuous operation & Type ST2 PVC compound as per IS-5831, which is suitable for 85°C continuous operation.