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Minor works certificate for changing fixed equipment.

wessex
My question relates to changing extensively like for like current using equipment. For instance changing down lights for integrated LED type with subsequent tests and form filling.

In the description of minor works being clear that the new fittings are being connected to existing wiring.

Then for testing. R1 + R2 with polarity check, straight forward enough. Then to insulation tests. Would disconnection of new fittings to undertake the LL be pointless as not part of an initial verification as an existing circuit and a LN linked to earth test more appropriate, possibly at 250V as fittings maybe sensitive to a 500V test. Given that if no limitations allowed, is N/A appropriate for the LL test. You would not be taking responsibility for the installation of the wiring, but checking it's suitability in relation to load and protective device, are the suggested tests adequate for checking suitability for continued use and also leaving the circuit no less safe then when you started.

Your thoughts please.
  • 0
    Let us say that you are faced with changing out 20 downlights - you'll be dismantling/disconnecting anyway, so no problem with full testing there, but what if the same circuit contains another 20 which you won't be changing. How much dismantling are you prepared to do in order to find the end of line for your r1+r2 just so that you can tick the box?

    You have to balance the risk of accidently introducing a new fault on an existing circuit in the zealous pursuit of box ticking.

    Now, since you will changing the first 20 lights, it will give you ample scope to examine how the old fittings have been wired - are the cpcs cut off/not sleeved? Does the outer cable sheath FULLY enter the connection enclosure on each fitting?

    From this exercise you will get a feel for how the installation has been conducted, and you can then go on to make a decision as to whether or not a full inspection of the rest of the circuit is required.


    Similarly, for IR testing, if wiring has been looped at the switches, you may be able to disconnect that part of the circuit which you are not working on, and then go on fully test the bit that you are working on.


    It is all about experience rather than a slavish approach to ticking every box. Take a good engineering approach before using the tools - have a look, have a sniff, have a pull at the connections. If everything looks ok, then you can most likely go on to omit some of the over the top testing requirements so long as you put a note with the the form as to why you have done so.
  • 0
    Yes. All very good points and thank you.

    I understand what you find during the work could determine the testing, but the form filling is also a big part. The BS7671 minor works form is a little limited on space so was looking to keep box ticking to a minimum. In the past I’ve listed a limitation to sensitive connect electrical equipment, so LN to earth test at 250V as per part six. Perhaps the minor works does not have to be so rigorously adhered to as an EIC.

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