circuits

  1. Lister1987

    Best way to trace circuits and generate house schematic?

    As title suggests, I want to look at mapping out exactly what the wiring is doing in our home. I've got a tone & probe and fuse finder, just wondering from the more experienced here, what the best way to go about it is? Some should be straightforward; kitchen and bedroom circuits but lighting...
  2. Midwest

    Emergency Lighting Circuits

    Having been at present place of work, for just overs a year now,just started to feel comfortable with the place. It’s predominantly a care home, and has all the normal infrastructure in place. I've never down much work with emergency lighting, other than installing it. Can anyone explain the...
    • Midwest
    • Thread
    • circuits emergency emergency lighting lighting
    • Replies: 11
    • Forum: Lighting Forum
  3. W

    Gym with lighting over 4/5 circuits and 2 mains

    Hello, currently working on a gym with 4/5 lighting circuits across two mains boards I’m wanting to put some emergency lighting in there and I’m wondering how I do that with this number of circuits across different rcds thanks in advance
  4. A

    Earth Fault Loop Impedance Test for lighting circuits

    Hello guys, Do you do Earth fault loop impedance test for lighting circuits during periodic inspection ? do you measure it at the lighting point? what is the percentage of lights you test? Thanks alot in advance
  5. HappyHippyDad

    Global Insulation resistance <1MΩ but individual circuits are all > 1MΩ

    With regards the title is the reason for this because the circuits are all in parallel? I am talking in relation to a L/N - E test. If Rt = global resistance for whole CU and R1, R2, R3 = L/N - E resistance for each circuit then am I right with the following: 1/Rt = 1/R1 + 1/R2 + 1/R3 So...
  6. HappyHippyDad

    Can radio linked smoke alarms be on different circuits, including a ring?

    I have just been to look at a job were the builder has started the first fix as I was unable to be there. He has forgotten to put in a cable to the heat detector in the kitchen, partly my responsibility as I should have reminded him more fully. My plan is to have it radio linked to the hallway...
  7. Power Calculations in Circuits | Electrical Training Video

    Power Calculations in Circuits | Electrical Training Video

    This video explains power calculations in circuits and how to use the calculations. Trainee Electricians studying for qualifications such as NVQs and other electrical courses may find this helpful.
    • Lou
    • Media item
    • circuits electrical videos trainee
    • Comments: 0
    • Category: Trainee Electrician Videos
  8. Electrical Circuit Components Overview

    Electrical Circuit Components Overview

    Easy to understand video lesson in Electrical Circuit Components. Provides a good overview of components including the resistor, capacitor, inductor, transistor, diode and transformer. A good source of information for Electrical Trainees on NVQs and other courses.
    • Lou
    • Media item
    • circuits electrical trainee nvq
    • Comments: 1
    • Category: Trainee Electrician Videos
  9. Y

    Number of Conduits run and number of circuits

    I am in estimation and often estimate conduits run in the drawings. My clarity about number of conduits run is not good. I want to know that in multiple circuits zone, how we calculate number of conduits run to the panel. For example. If i run conduits from Ckt A-1 to ckt A-2, i need Two number...
  10. M

    Recording of 3-Phase Circuits

    Hi all! So, I was filling out a test sheet for a number of 3-phase circuits we did an EICR on. For years whenever a 3-phase circuit exists I have recorded them on a single line (eg. 1/TP or 1/L123) and recorded the highest or lowest value applicable to that particular test regardless of...
  11. Sparksaflyin

    Dual board with no earth on final circuits

    Hi guys. Need to change the fuseboard at my parents house but none of their final circuits have a cpc run to them. Obviously have an earth on the main incoming so I can get a 16mm earthing conductor up to my new 18th edition metallic consumer unit but they don’t want a rewire so none of the...
  12. R

    Extending ring final circuits

    Hi. I have a CU move to do - around 5m from current location. There are 10 circuits, 4 of them ring finals. I'm considering whether to extend the rings 'as are', or to split the rings somewhere in their approximate middles and extend them to separate RCBOs as radials, the aim being to reduce...
  13. S

    RCD tripping under high load on 2 circuits

    I’m in desperate need of someone with great fault finding knowledge. I have a dual rcd consumer unit as seen in picture. The left hand side rcd trips when anything with a high output like a tv for example is turned on in any sockets protected by the left rcd. The left rcd also trips when trying...
  14. P

    3p breaker feeding 3 x 1p circuits

    Hi everyone. I may be blind but I can't find a definitive answer. Can I use a 3 pole breaker (originally feeding a massive 3 phase heater) to feed 3 single phase circuits? I've run seperate neutrals for the 3 new circuits and the breaker is rated for the load required - 30a per phase (I'd...
  15. W

    Cooker circuits fusing down ???

    Hello I’ve pulled out a electric oven and the connection plate at the back for the cooker circuit has 2.5mm hardwired to the 6mm circuit for a 1.76kw load and also a 6mm connecting a induction hob,unknown load. Does the 2.5mm need to be fused down or is it okay being spurred off the cooker...
  16. kingeri

    10mA RCD for bathroom circuits

    Been to look at a job this morning for a CU change, customer the type who wants to have his say on every tiny detail. He has already bought the CU as well, a Wylex RCBO unit..... I pointed out that the RCBO ratings he has bought don't align with what I actually need...and that some will need...
  17. Z

    I never install ring circuits, the potential for danger is unacceptable

    I’d like to know if anyone else here refuses to install ring circuits in domestic premises. For me it’s either a 20a radial / tree circuit with 2.5mm, or a 32 radial / tree circuit with 4.0mm. Frankly I’m tired of finding broken ring circuits on 32a CB’s, as well as mismatches on end to end...
  18. Michael J

    Lighting circuits are not earthed

    hi all, yesterday I went to carry out an EICR on a 1 Bedroom Flat. The lighting circuits are not earthed,the installation is about 40 years old. The only thing I can do is C2 would you agree? It has RCD protection. It has some class 1 fittings.
  19. ETradesmen

    Bunches up lighting circuits

    Good morning all! Currently carrying out an EICR on a commercial property and have noticed 8 lighting circuits bunched into 2 MCB’s. 0-EE74-FE0-F729-4048-A7-F4-2979-EBDFD688 - https://ibb.co/hCTKpsC No real danger but not very practical as nuisance tripping could occur and the labelling is a...
  20. S

    Supply and final circuits for stables.

    Hi all, just looking for advice prior to a potential upcoming project supply stables for horses. The supply characteristics into the main house is TNCS and the stables are located approx 40m away from the building. I am thinking of putting a 1w non-rcd protected consumer unit at supply end...
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