circuits

  1. P

    Security lights ,can't switch off. On 2 circuits?

    Hi I have two security lights controlled by three PIRs. Recently the lights have been coming on at random throughout the night, I suspect the PIRs to be faulty. I tried (at 3am) to switch them off.There is a fused switch in a bedroom which is fed from an adjacent socket which will switch them on...
    • paul243
    • Thread
    • circuits lights off security switch
    • Replies: 24
    • Forum: DIY Electrical Advice
  2. Frimley111R

    Checking other circuits after fitting outdoor socket?

    Hi All, Firstly, I am not an electrician but, two of us are starting a electrical contracting business in a niche product area. Our newly qualified electrician is saying that if he fits, for example, outdoor sockets, that he has to do a ton of testing of other circuits in the house to verify...
  3. S

    Farm installations, division of circuits.

    Good evening everyone. I live in a rural area and as such get asked to do work on farms so I'm looking to find out how others go about certain types of farm installations. I find the division of circuits quite difficult without spending a fortune on switch gear and RCDs, especially on 3 phase...
  4. Gavin John Hyde

    Light circuits in Consumer Unit

    i don't have much domestic experience as i have worked largely in shops and pubs during refurbs. I have a potential job lined up i want to use for the NICEIC assessment. The customer wants a new consumer unit. The current one also has holes in the side from old cables and is barely hanging...
  5. C

    New Water meter tripping circuits

    Bit of a head scratcher.... Haven't done any testing yet but thought I'd see if anyone else had come across this... A client of mine has just had Water meter installed at the front of their drive by the Water Board. Now, a 32A breaker for their power ring is tripping. Not sure how the water...
  6. B

    EICR IR testing on whole installation with circuits protected by RCBOs

    EICR IR testing whole installation with circuits protected by RCBOs... Say it's a single phase consumer unit, plain main switch no RCCBs, all circuits protected by RCBOs, Is this method acceptable?.... L+N to earth only. Main switch off (safe isolation), all breakers on. Temp link...
  7. M

    No resistance Circuits

    Hi guys, How do you use ohms law on a circuit with 0 resistance? So, assume there is 10Amps and 0 Ohms on a circuit, how would you find the voltage? (E=IR?) Also assume you have a circuit with no resistance on it, where would be considered the return path? Like the potential difference I mean...
  8. charlie76

    H4 Cooker Circuits in household and similar premises

    Evening All. I am supplying a cooker and an electric hob from a single circuit via a single isolation switch. When calculating the demand with diversity i.e. first 10A + 30% remainder, should this be for each appliance then added together or combined? Either way I get 28.4A or 21.4A for a 6.6kW...
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