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    Extraneous conductive part testing.

    thanks for this. So I’m 100% clear I could use a Megger MFT ( set to continuity) and one probe on the MET and one on the metal part in question. If I get a reading higher than 22Kohms then won’t need to bond. I tried today and I got about 40K ohms with continuity and 0.04 Mohms with IR setting. 
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    Extraneous conductive part testing.

    To determine if an metal work is classed as an extraneous conductive parts then I understand that a test is to be carried out between the metal work in questions and the MET. I know as a general rule if the reading comes back as 22Kohms of higher then the part doesn’t need bonding, however some...
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    Disconnection Times

    I understand that for a TN system it is 0.4 max disconnection time.    If for a distribution circuit you are allowed 5s max disconnection time, does that mean if you have a garage consumer unit on a MCB of the house consumer unit does that make the circuit a distribution circuit serving the...
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    Adding non protected MCB to a duel RCD board

    Thanks for your thoughts chaps. He spoke to customer and they will just have a main switch board in the garage , 1 circuit for sockets and another for lights. Then he will just come off a MCB for one of the existing RCD. Yes ideal to use RCBO or Board change but the above will do the job. At...
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    Adding non protected MCB to a duel RCD board

    a couple and sockets and a some lights 
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    Adding non protected MCB to a duel RCD board

    If you have a garage board with a main switch not an RCD but then if it is supplied from a MCB from the house CU that Is on a RCD. Would this not be poor selectivity/discrimination as if the garage had a fault it would knock out half the house ? That’s what the chap I was with said or is he...
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    Adding non protected MCB to a duel RCD board

    Is it possible to add a non protected MCB to a duel RCD Board. A non protected circuit would serve a mini garage board that has its own RCD. The chap i was with today was quoting to put a garage feed up to the top of the garage. He said that as they have a Duel RCD board it can’t be done and...
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    Max Demand

    Max demand  Am I right is thinking if I wanted to work out the max demand of an install the following would be a good rule of thumb.  40 A - cooker  32A - ring  32A - ring  6A - lights  20A - radial  32A - ring  6A - lights  6A - smoke  40 + (0.4 x 32+32+6 + 20 + 32 + 6 + 6 ) = 93.6A...
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    SWA termination

    Thanks, of course a 10mm2 earth from the switch fuse to the main consumer unit earth bar. I hear you about a metal box and could do that below the consumer unit to cover the square knock out. I know inside the adaptable box I could just bring the SWA cores through but if I wanted to join SWA to...
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    SWA termination

    If you have a 10mm2 SWA that needs to come back to the main consumer unit but it would be a nightmare to gland into the consumer unit because it only has the Hager Square knock outs - would it be acceptable to terminate the SWA into a switch fuse then run a 10mm2 T+ E back to the board on a MCB...
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    Smoke/heat alarms

    Thanks for your thoughts chaps and yes true re kitchens in wales. I asked the chap to clarify and he admitted he explained it wrong. He meant with Aico they have a certificate that can be filled in not a form to be filled in for building control. 
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    Smoke/heat alarms

    Was helping to install some interlinking heat/smoke alarms in a house yesterday. They were just off the lighting circuit and no new circuit needed. I know normally that if something is installed on a existing circuit and not in a special location it doesn't need to be notified. However the guy I...
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    RCD for Fault Protection

    UNG I’m not sure if you are expecting an answer from me. Not sure if you see my other posts but I’m sure the regular chaps that push me in the right direction to an answer would back up the fact I’m not spoon fed answers. I give my thoughts on the questions, there’s no point in being given an...
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    RCD for Fault Protection

    Thank you for this. Is there a table that tells us the allowed vaules ( like with ZS) ? 
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    RCD for Fault Protection

    that’s a fair point this would give a bit more  leeway.    I assume that when the power is in the shed when fused down for the lights to a 3A fuse then using the 1362 would give more leeway for the lights.    Thanks for flagging this up. But so I fully understand for future if the 80% Zs Is...
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