What is the maximum operating temperature of PVC insulated cables?

70°C under normal continuous operation and 160°C under short circuit conditions.

What is the standard high voltage test for these cables?

For routine testing, the cable must withstand 3 kV AC for 5 minutes without breakdown.

Can copper conductors be used under this standard?

Yes, while aluminium is most common for heavy-duty power cables, the code permits stranded or solid copper conductors conforming to IS 8130.

IS 1554 Part 1

: 1988

PVC insulated (heavy duty) electric cables for working voltages up to and including 1100 V - Part 1: For aluminium conductors

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IS 1554 Part 1 specifies the manufacturing guidelines, construction requirements, and testing procedures for heavy-duty PVC insulated and PVC sheathed cables with aluminium or copper conductors for working voltages up to 1.1 kV. It dictates the dimensional standards for insulation, inner sheathing, armouring, and outer sheathing to ensure electrical and mechanical safety.

Covers requirements for PVC insulated heavy-duty electric cables with aluminium conductors for voltages up to and including 1100 V.

Quick Reference Values

voltage ratingUp to and including 1100 V

max operating temperature70°C

max short circuit temperature160°C

routine high voltage test3 kV AC for 5 minutes

Practical Notes

PVC cables have a lower current carrying capacity than XLPE cables (IS 7098) due to a lower maximum operating temperature (70°C vs 90°C).

Always specify FRLS (Fire Retardant Low Smoke) outer sheathing additionally if the cables are to be routed indoors or in confined spaces, as standard PVC emits toxic smoke when burned.

Wire armouring provides better flexibility and mechanical strength against pulling tension compared to strip armouring, but strip armouring is more economical.