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Securespart Might sound silly, how do I test Rcd in isolation. :roll:

Zs is 1.32, Protected by type B MCB rated at 16A. Wiring all 3 is 2.5 mm and the armoured also is connected to Earth. Insulation resistance >299 on all three. Could not get a trip on 1 RCD with several attemps, but same circuit was fine when swapped over to the other RCD

hi, I am testing a circuit that goes to the garden with armoured cable. The RCD will not trip at x 1 (gets over 400ms) but trips fine on x5. The other circuits seems to be fine with the RCD test (30 mA). Using megger mft 1552. Any reason? When I move that circuit to the other RCD (30...

scarypants you are right. The lights came with 2 core connections. Hence the cpc cannot be connected to the light. I was thinking more about the continuation to cpc within the downlights circuits. This has more to do with if the lights were changed one day. Also the book Snag1 - it...

I would reconnect the cpc continuity on the downlights. Any Views on that bonding issue for the bathroom . Does metalwork still require bonding. PIR means ....? All help has been very much appreciated :D :D

Replacing a consumer unit with 17th edition with 2 RCDs On Testing R1+R2 on lights, the downlights do not have continuity of cps, the cpc wires have been cut short on each light connection/interconnection. (I get R1+R2 reading in the last room which does not have downlights). The downlight...

wingcoax Yes I have two spare connection in the Consumer unit. The wire is running in the ceiling spaces downstairs and up airing cupboard to loft for upstairs. Have not bought the actual detectors yes and the wiring is sort of there but not finished yet. Thanks

I am fitting two smoke detectors. One upstairs and one downstairs. Also I am putting a heat detector in the kitchen. These will be on their own circuit without RCD. 1) Should I interconnect all of them? 2) Should I have two dedicated circuits - 1 for upstairs and 1 for...

hi for ze, by earth electrode, I mean disconnecting the Suppley 16 mm cable from the main earthblock and testing between the consumer unit incoming Phase and the disconnected 16 mm earth cable. If I understand correctly the zs should be ze + (R1+R2). The (R1+R2) should be the highest that...

How do you measure the earth fault loop impendence zs for the supply. I take is this is not the same as ze with the earth electrode disconnnected. :?:

Jason I am in St albans, Hertfordshire

I am looking for some good quality Melanine chipboard - cream coloured to build the carcass for a wardrobe. I would like to know of any nationwide supplier where I can get these from. Cheers.