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    Complex intermediate switch question

    Yes, but this isn't at all safety related, or a 'what size cable do I need to feed my shed' type of query. It's help sorting out the connections to some oddly labelled switches, some of which aren't being connected as intended. In all honesty, who amongst hasn't had to return to a newly wired...
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    Help with light blowing breaker. Not newly fitted.

    Requirement or not, I've not installed a domestic lighting circuit without RCD protection for double that.
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    Help with light blowing breaker. Not newly fitted.

    Is the "breaker" a MCB or RCBO? If a MCB, is the circuit also protected by a RCD?
  4. B

    Low frequency humming noise in the apartment?

    Air source heat pump? Humming complaints from neighbours are going to become common.
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    Smoke alarms

    Am I missing something here? What's a new lighting circuit got to do with a smoke alarm circuit? Few would disagree that anyone who doesn't have working smoke alarms in their property is an idiot, but I can't see the connection.
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    Napit.. Do you still choose the job, or do they?

    So now sparkies are supposed to be familiar with the entire scope of the building regs, while every builder I have ever met doesn't have a clue about any of them.
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    Fireworks and bonfires anybody?

    Bonfire night and the surrounding week are always good for me. Both holiday cottages full with owner's of firework phobic dogs, who come here every year because there's no fireworks for miles.
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    Ffing fairy lights

    Get yourself three 9V batteries (PP9 best, but PP3 might just do for test purposes), lie them flat on their sides and plug them together in series to form a 27V battery. Cut the three pin plug off, bare the ends of the three wires, mark them somehow, and try them two at a time, both ways around...
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    Toyota Cressida GLX 1989 electrical short

    Blown blade type fuses aren't always obvious. Swapping identical ones over is often the best way of checking them.
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    Good Morning Thread - Come say good morning, tell us what you've got on today. :)

    My other half has between 15 and 20 blood tests a year, so is well familiar with what you describe. Sometimes the needle goes straight into the right place, and the phials fill up one after the other, with no problems, and other times she comes out covered in multiple bruises from failed...
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    GU10 flashing when turned on, work if load added to circuit

    As Avo Mk8 has written above. I really must learn to read posts more carefully before replying!
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    GU10 flashing when turned on, work if load added to circuit

    The problem is being caused by capacitive leakage between the strappers of the 2W switches, giving rise to a voltage at the lamps which builds until the LEDs fire, discharging the voltage. Repeat. The usual solution is to add 'snubber(s)', consisting of a resistor and capacitor in series. Search...
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    Why does a fridge freezer fail an insulation Pat test?

    Had one once where the heat from the interior lamp was melting ice (that had formed where it shouldn't have) when the door was opened, the liquid ran down onto live parts near earthed metal and tripped the RCD a minute or so later. Water then froze again, so IR was good again when tested.
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    UK Why is neutral at 0 volts?

    'Voltage' is just stating units for potential difference. Similar to 'pounds' and 'money'..
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    UK Why is neutral at 0 volts?

    Voltage difference, to be pedantic.
  16. B

    IR External Car Park lighting

    As above. I assumed the cable had been isolated, and the poor readings were from that alone. I almost expect to find less than perfect IR readings from any outdoor lamp fitting that has been in use for some time.
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    UK RCD issue baffling me

    Seen this where T&E has been fixed with a flat bend of too tight a radius.
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    UK Why is neutral at 0 volts?

    The full voltage available (230V) distributes itself along the live supply wire, the load, and the neutral wire in proportion to their individual resistances. For instance, if the live supply wire was 1 ohm, the load 8 ohms and the neutral 1 ohm, there would be 23 volts from end to end of the...
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    IR External Car Park lighting

    Not sure I agree with this, whatever the scams guidelines, or even the regs, may say. Any IR resistance that a MFT can indicate, other than max of range, on a plastic cable with nothing connected to it, indicates existing damage or deterioration to that cable. Without knowing exactly what the...
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    UK RCD issue baffling me

    It could be an abandoned cable going nowhere. In a case like this, I'd fully disconnect it and wait to see if anyone complains.

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