circuits | Page 6

circuits

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  1. T

    multiple circuits stopped getting power same time, replaced all, still no power??

    video explaining/showing problem View: https://youtu.be/VjtsPzzZYrQ this is a eaton cutler hammer circuit breaker. The house was built in 1969 but the breaker was upgraded to this eaton 9 years ago when i bought it. House uses mostly older outlets that are 2 prong, not 3 prong. HOuse does...
  2. D

    AFFD's and new circuits

    Hi All, I'm a quilified electrician that's been office based for the last two years, I'm a little out of touch so please go easy if this is an obvious question! I'm having an extention on my home this year and been thinking about additions and it got me thinking, are AFFD's needed when...
  3. C

    Emergency circuits

    Ok, say you had a building that needed backup power. Does British Code require that the loads be subdivided onto different branches and automatic transfer switches based on type and priority?
  4. S

    Havin random breaker fault issues with my home where random circuits trip breaker with no pattern .

    So bought my house in june . When i moved in I hooked ac window unit in my bedroom it tripped the afci breaker for that circuit so I temporarily ran extension cord from spare room to my bedroom to solve the issue . After a week i decided to try hook ac up normally again . Never tripped breaker...
  5. P

    shared neutral in lighting circuits

    I need some help in deconstructing the following ( please see photos of upstairs downstairs switches ) as I don't know what the circuit diagram would look like in this case? It works perfectly well Is seems to be a shared neutral circuit but does not follow the normal convention as shown in the...
  6. C

    Circuits for Motors- how to in the UK?

    How do you size the MCB, wire and protection for a motor in the UK/Europe? How is it typically done? ............................................................................................................. If anyone is curious here how its done in the US: You size the conductor based...
  7. 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...
  8. 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...
  9. 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
  10. 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
  11. 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...
  12. 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...
  13. 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
  14. 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
  15. 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...
  16. 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...
  17. 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...
  18. 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...
  19. 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...
  20. 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...

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