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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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    My ideal way to handle the job would be to test the existing circuits first, determine that they are suitable and safe for continued use, (an EICR would be ideal) and then do the new works, and then re-test the whole lot. 

    There would seem to be little point in only testing the new bit - if its in the middle of the circuit especially. 

    An addition on the end of a circuit - well perhaps just checking the new bit has some merit, but - not if the addition is at the start or in the middle of the circuit…….. 

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    My ideal way to handle the job would be to test the existing circuits first, determine that they are suitable and safe for continued use, (an EICR would be ideal) and then do the new works, and then re-test the whole lot. 

    There would seem to be little point in only testing the new bit - if its in the middle of the circuit especially. 

    An addition on the end of a circuit - well perhaps just checking the new bit has some merit, but - not if the addition is at the start or in the middle of the circuit…….. 

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