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    What is this called and where can I get it?

    The screening is there to prevent interference to the signal from the car's other electronics, and would normally be grounded at one end only (so that a current doesn't actually flow through it). The bare wire runs along with the foil simply to enable a connection to be made to the foil, and to...
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    UK RCD issue baffling me

    All depends on the resistance of the actual fault. If it's low enough, then the lighting circuits may well trip their RCD.
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    UK RCD issue baffling me

    Yes, that's the general idea, but there might also be a balanced current flowing through the RH RCD as well, if the RH circuits are in use. May be 30A flowing through the live of the RH RCD, but if there's 30.02A flowing through the neutral of the same RCD, even for just a few milliseconds, then...
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    UK RCD issue baffling me

    If you just disconnect the neutrals, leaving the lives connected, you stand a good chance of raising the voltage on those neutrals, so that the N-E fault now becomes a L-E fault, and now thrips the RCD because of the imbalance resulting from that. IR testing with a MFT is the usual way to track...
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    UK RCD issue baffling me

    As I explained earlier, there is a parallel path for the neutral current to return to the service head. One that results in a small proportion of the neutral current from the socket circuits, but not the live current, flowing through the RH RCD, thus unbalancing it. The proportion of diverted...
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    UK RCD issue baffling me

    N - E fault will be in the RH circuits, and could be a lighting circuit, especially if any of the lights are outdoors, but I'd concentrate on the two circuits that are labelled as cookers/ovens/hobs first of all, even if it's just turning off their DP isolators when not in use.
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    UK RCD issue baffling me

    Typo?
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    What is this called and where can I get it?

    It's a readily available 4 core screened cable. Why are you trying to recreate it?
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    UK RCD issue baffling me

    Because most of the neutral current from the LH circuits will flow back the neutral tail to the meter and then the service head, but a small proportion will pass through the RH RCD neutral side, down the neutral wire of the faulty circuit, through the neutral - earth fault, back the cpc of the...
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    UK RCD issue baffling me

    Is it the same electrician who installed the CU that's doing the testing now? Not exactly impressed with the distribution of circuits between the two RCDs in that CU. It'll be an earth to neutral fault in one of the RH bank circuits, and things with ceramic, metal enclosed elements don't always...
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    Hello everyone

    Did you try to include a link to another website?
  12. B

    Line voltage wall thermostat wiring.

    If it's a single T&E to an old mechanical 'stat, then it'll be live and switched live. Sleeving wires of the wrong colour was unheard of in 1970 (when I started). The thinking then was that if you were too stupid to realise that the black was a switched live, then you probably shouldn't be...
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    Is this meter installation ok?

    If the isolators are independent of each other, then the way it is wired in your diagram is unsatisfactory and dangerous for the reason you said in your OP.
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    Is this meter installation ok?

    If the markings are as you say above, then it does look like it's two separate isolators, in which case the neutral block should be between the meter and isolators, with a neutral fed to each isolator.
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    Fire alarm cert for extra smoke detector

    Any 230V wiring will come under the regs, but not the detectors themselves.
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    Is this meter installation ok?

    If things are as your diagram, then all is well, but your text throws doubt on whether it really is a four pole isolator. It's quite common for multipole lever operated devices to be made up of single pole devices riveted together with a crimped on profile or a pin linking all the levers...
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    UK Whirlpool bath

    They should be joined together, connected to the earth cable of the supply, and the supply protected by a 30mA or lower RCD.
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    UK Immersion heater timer

    This is an often missed point with oil boilers which tend to be remotely sited from the HW cylinder, but I have a bathroom towel rail on the primary circuit. When the oil boiler switches off, a valve closes and isolates the cylinder coil, but the pipework, boiler contents and towel rail form a...
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    Replacing LED chip on ceiling light.

    Which is why I avoid integrated LED fittings as much as possible.
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    UK Is the main fuse head satisfactory protection for SWA supply cable?

    Check that there isn't fuse or MCB tucked inside the case of either of these, especially the rotary isolator. Total bodge, of course, but I've seen it done where space has been very limited.

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