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TESTING AN RCBO AT A LIGHT SWITCH

ietmgreen
I asked this question some time ago, but during the site changeover I somehow got locked out.

So I would like to ask again.


Is it acceptable, using a two-wire RCBO tester (Megger RCDT320), to test at a light switch using the phase and earth wires?

If it is acceptable are there any disadvantages?

Regards,

Mike.
  • 0
    To what ends?

    If you can carry out a two wire non-trip earth loop test to confirm earth continuity and a RCD test at the light switch, what is to be gained by dismantling the consumer unit?
  • 0

    Sparkingchip:

    To what ends?

    If you can carry out a two wire non-trip earth loop test to confirm earth continuity and a RCD test at the light switch, what is to be gained by dismantling the consumer unit?




    A question I suspect best put to the GN3 author and/or IET tech help. The trade body is presumably just following IET guidance, as am I. The guidance note is just that: guidance, so do your own thing and be happy to sign your name to it. I however am happy to follow that recommended by those more learned at the IET than me.


    Regards


    F

  • 0
    Just gone 9.00 pm on a Sunday evening I have finished filing this weeks minor works certificates having been doing the relevant invoices and emailing them along with scanned copies of the MWC.


    So before turning my desktop off I had a look at one of the YouTube video links posted by Zoomup and it rolled onto another one about changing a light switch.


    I cannot image the consumer unit was opened for testing and actually I didn't notice any testers being taken into the building to do any testing at all, but the chances of the installed replacement switch being dangerous must be virtually nil as no shock risk is likely.


    Andy

  • 0

    One could say, in some respects then,that testing at the remote end of a circuit has the advantage of potentially  revealing other faults and thereby improving the integrity of the circuit.



    Any such problems that might affect the safety of thr circuit should have already been detected by previous tests (insulation resistance and c.p.c. continuity) before you start doing any live tests such as RCD tests.


    - Andy.
  • 0
    A loop test to confirm there is an adequate earth is always required before a RCD test on circuit cable such as a twin and earth.


    Andy B.

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