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Modifying existing power

James Edward Duncan

A client of mine needs to re-route part of a number of small power circuits (230v, low amps). It is preferred not to replace the circuits in their entirety, due to hazardous materials in the location.

So, cutting the circuits and jointing the now 2 new ends with a new cable is the option available.

For me I would test the entire circuit end to end, however my client only seems to want to test the new section! How would I persuade them that this is the wrong thing to do?

Also, the older parts of the circuits are potentially 20+ years old. So when I do the insulation test, do I still test to current regs? 

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    The existing circuits should in my view be tested before starting work. MINOR deviations from the present regulations MIGHT be acceptable for the existing part of a circuit.

    But major shortfalls no way !

    Would it be acceptable to extend an existing 32 amp power circuit that is wired in 1.5mm cable ? No way ! but how would you know the cable size and OCPD size without a test and inspection.

    Would it be acceptable to extend an existing power circuit with no earth continuity ? Surely not, yet how would you know without an earth loop test.

    Would it be acceptable to extend an existing ring final circuit that already serves 108 square meters floor area ? Probably yes if otherwise in order.

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  • 0

    The existing circuits should in my view be tested before starting work. MINOR deviations from the present regulations MIGHT be acceptable for the existing part of a circuit.

    But major shortfalls no way !

    Would it be acceptable to extend an existing 32 amp power circuit that is wired in 1.5mm cable ? No way ! but how would you know the cable size and OCPD size without a test and inspection.

    Would it be acceptable to extend an existing power circuit with no earth continuity ? Surely not, yet how would you know without an earth loop test.

    Would it be acceptable to extend an existing ring final circuit that already serves 108 square meters floor area ? Probably yes if otherwise in order.

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