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Earth Continuity Test and Polarity Test following when replacing low voltage single phase fixed electrical equipment

Rob Bain
Hi all,

Would appreciate your thoughts on the need to undertake Earth Continuity tests and Polarity tests following replacement of single phase low voltage fixed electrical equipment such as tea boilers / heating pumps / immersion heaters etc, that are supplied either from a switched and/or fused connection unit or an isolator. The existing electrical supply cable is going to be re-used as the equipment being replaced will be like for like, so there is no increase in load, no requirement to undertake a design.

This enquiry has been put forward as it is anticipated that (some) engineers, who have a mechanical background but with limited electrical knowledge (safe isolation), would be able to carry out the replacement of certain items of plant once they have completed some competency training followed by assessment and sign off by the company's NIC EIC QS. 


Thanks in advance.

Rob
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    The  absolute minimum, a quick buzz test for continuity from the case to a nearby socket or similar. There is a slight risk the nearby socket has no earth when you start of course !

    If it is earthed, then at least all the other bad faults would be  self-revealing on energising.


    If these folk are only doing occasional wiring, then a reminder mechanism for where to check and what to do if you are out of your depth needs to be part of this - a "what to do if" reminder ending in  'phone a friend' for the 'any other case' as a laminated pocket flash card or similar may be an idea, - much as if you have trainees doing stuff, and they get stuck, they know to stop and call, rather than to try and wing it.
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    The  absolute minimum, a quick buzz test for continuity from the case to a nearby socket or similar. There is a slight risk the nearby socket has no earth when you start of course !

    If it is earthed, then at least all the other bad faults would be  self-revealing on energising.


    If these folk are only doing occasional wiring, then a reminder mechanism for where to check and what to do if you are out of your depth needs to be part of this - a "what to do if" reminder ending in  'phone a friend' for the 'any other case' as a laminated pocket flash card or similar may be an idea, - much as if you have trainees doing stuff, and they get stuck, they know to stop and call, rather than to try and wing it.
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