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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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    You can use BS7671 to determine suitable tests, but this appears to be a work place - as such it is covered by the Electricity at Work Regulations 1989.  These are mandatory. 

    Take a look at Regulation 5.  Also look at the guidance notes to Regulation 5.  

    Imagine the situation if a system failure occurred and someone is killed or injured. When you and the directors of this company are in court - what reason will you give for not having verified that the complete modified system met the requirements of the EWR (Guidance note para 83 specifically mentions testing).

    Regards

    Geoff Blackwell

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  • 0

    You can use BS7671 to determine suitable tests, but this appears to be a work place - as such it is covered by the Electricity at Work Regulations 1989.  These are mandatory. 

    Take a look at Regulation 5.  Also look at the guidance notes to Regulation 5.  

    Imagine the situation if a system failure occurred and someone is killed or injured. When you and the directors of this company are in court - what reason will you give for not having verified that the complete modified system met the requirements of the EWR (Guidance note para 83 specifically mentions testing).

    Regards

    Geoff Blackwell

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