circuits

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  1. D

    Extending Circuits for a side extension

    Hi, I have been asked to price for a side extension which will contain a utility room, office, few down lights etc. The house was rewired by another firm 18 months ago, with all the correct paperwork etc and completely renovated. A RFC and lighting circuit have been installed and terminated in...
  2. D

    Extending Circuits for a side extension

    Hi, I have been asked to price for a side extension which will contain a utility room, office, few down lights etc. The house was rewired by another firm 18 months ago, with all the correct paperwork etc and completely renovated. A RFC and lighting circuit have been installed and terminated...
  3. H

    Common live wire for three circuits

    Hi, Hoping someone can help me with a lighting circuit challenge. I have an existing two gang switch, with one 2C&E cable for a simple circuit and one 3C&E for a two-way circuit (using conventional 3 control wiring). It's an older property but pretty conventional loop-in loop-out radial...
  4. SparkyChick

    Testing off-peak circuits during on-peak period

    Hi chaps, Just wanted to gather some feedback about this topic. To give it some context, yesterday I went to sort out why one storage heater in a property was on all the time. 24 hour board + Economy 7 board. History of the circuit... small bedroom had a convector heater removed and replaced...
  5. D

    SY cable for distribution circuits and final circuits

    Hi all, Just a question relating to SY cable and the use of SY cable. My boss his carrying out a EICR for a industrial premise and coming across a lot of SY cable. These cables are used for final circuits and distribution circuits. I know that BS7671 list SY cable as non - standard cables and...
  6. P

    Microwave tripping circuits on two separate CUs

    Hi All Bit of a strange one... My mother in law decided to poach an egg in the microwave, and whatever she did, the egg went bang and knocked out the kitchen sockets. Strange thing is, it looks like this also tripped circuits on a separate CU which feeds external sockets & lights etc. It...
  7. Dannyg8810

    High zs on low bay lighting circuits

    just been looking through an EICR we've had done and there's x4 circuits on D type mcbs which have been given c2's as the zs is higher than the maximum permitted...... Iv looked c type would bring this within the maximum permitted I don't see why these need to be on D's 2.5 t and e on 20a...
  8. A

    How to calculate the tabulated current (It) for circuits with multiple Reference Methods (A and B)?

    I am trying to select a suitable conductor size from Fig 4D1A of the BS 7671 Book, and am encountering a problem because the circuit does not conform to one Reference Method. The circuit conductors leave the distribution board in wall mounted steel trunking, then run through some steel conduit...
  9. tank

    Multiple circuits in breaker approach

    Doing an eicr on a landlord board, in a small 1940s block of bedsits, found a type 2, 30amp socket ring breaker with 5 x 2.5mm cables in it. I assume that 2 of the wires came from an empty adjacent 30 amp heater ring breaker that had been damaged (screwdriver busbar metal board bang) and the 5th...
  10. marcusone

    New E7 meter. Do I still need a timer for storage heater circuits?

    Hi guys I'm out of touch with modern meters and haven't done a E7 install for years. Trying to get info on a Ace9000 Kbd prepayment Economy 7 meter. I've installed an additional cu for two storage heater circuits. Empty flat and supplier has left an isolator after the meter. Can I connect...
  11. 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
  12. 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...
  13. 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...
  14. 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...
  15. 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...
  16. 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...
  17. 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...
  18. 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...
  19. O

    Circuits to kitchen island under (wet) under floor heating

    Pretty much as the title says - can anyone point me in the direction of guidance what distance I should allow between under floor heating and 2 x cables to an island in a new kitchen. Thanks
    • Octopus
    • Thread
    • circuits floor heating island kitchen under
    • Replies: 10
    • Forum: UK Electrical Forum
  20. G

    Shared neutrals in lighting circuits

    I am sure this has likely been discussed many times on the forum. Throughout my apprenticeship I heard about the fabled shared neutral on hall/landing light circuits but never actually come across one. I was told in college there is no way of testing directly for shared neutrals !? I am now...
    • Graham Hyde
    • Thread
    • circuits lighting neutrals
    • Replies: 14
    • Forum: UK Electrical Forum

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