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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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    Back in 1970 something we had an argument with a Building Inspector, he wanted the extension to a sewer installed in the 1930’s around forty years earlier tested and the only way to test the new part was to include the old part in the test.

    We said there was no point testing it as it would fail because of the old part and we weren’t under any obligation to replace the old part if it leaked, so he just needed to accept we had made a good job of the new part and let it go without testing.

    In the end I went to the Council Office and had a word with his boss, he laughed and said he would tell him to sign it off without testing, because it was obvious the old part would leak.

    Unfortunately though you cannot  extend a faulty circuit if it comprises the safety of the new part, so the existing part needs to be in an acceptable condition.

     

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    Back in 1970 something we had an argument with a Building Inspector, he wanted the extension to a sewer installed in the 1930’s around forty years earlier tested and the only way to test the new part was to include the old part in the test.

    We said there was no point testing it as it would fail because of the old part and we weren’t under any obligation to replace the old part if it leaked, so he just needed to accept we had made a good job of the new part and let it go without testing.

    In the end I went to the Council Office and had a word with his boss, he laughed and said he would tell him to sign it off without testing, because it was obvious the old part would leak.

    Unfortunately though you cannot  extend a faulty circuit if it comprises the safety of the new part, so the existing part needs to be in an acceptable condition.

     

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