circuits

  1. N

    25 ohms Zdb + same reading for all circuits

    Hi everyone, I have a particular job visited this morning, that on all circuits, at each point, i got a reading off around 25ohms for a earth fault loop impedance test(zs). I then thought to do the same at the DB for those circuits. Again, same reading was obtained. I then turned off the...
  2. O

    What's common practice with IR tests on lighting circuits?

    I had just installed a heat alarm on the downstairs lighting circuit during a kitchen rewire. The new kitchen ring / cooker circuit I tested IR for L-N and N-E at 500v, fine, but the DS lighting circuit consisted solely of 21 LED downlights, in various rooms and the alarm. All of which say do...
  3. S

    AFDDs for single-socket circuits

    Haven't been on here for a while, so sorry if this has been discussed before. BS7671 2018 + A2 Regulation 421.1.7 recommends AFDDs for "single-phase AC circuits supplying socket outlets..." (requires in certain premises). My intention is that from September 27th I will recommend them to...
  4. A

    7. 3 kw INDUCTION HOB

    Can I run a 7.3Kw induction hob off of 2 x 16 amp circuits single phase I'm not sure what size cable is installed, I will check. Would I be be able to run with the 2 x 16amp breakers or should I install a single 32 amp breaker with separate RCD? Thanks in anticipation.
  5. timhoward

    CPC common to 2 circuits...

    When I checked out this job I had a false sense of security from a recent competent looking EICR and two new CU's that looked to be fitted to a high standard. Most of the property does have a CPC on the lighting circuit, it's just this one room with a flat roof above that doesn't. This is where...
  6. D

    UK Radial Circuits Wired in 4mm and 32A MCB

    Guys needvadvice please I was asked to carry out an annual inspction of a DB recently There are 12 in number radial circuits suppling sockets wired in 4mm singles protected by 32A mcb the cables are enclosed in metal trunking and supply 13a socket outlets , are the mcbs now overated as the...
  7. M-B-Electrical-Services

    Recommended reading for motor control circuits

    Hi all. Just a quick one really. Some of my work has started to creep into the industrial sector and, as such, I'll need to do a bit of research in order for me to be able to fulfil my client's needs. The specific sector is Fire Sprinkler Systems so it'll be single/poly phase compressors...
  8. L

    Ring circuits to be retired?

    Could the 30% leakage requirement on rcd, s, combined with the inevitable increase in kitchen appliances with intentional leakage built in, force designers to replace rings with radial circuits?
  9. H

    Multiple circuits passing through an AC isolator

    Multiple circuits passing through an AC isolator what code is this on a U.K E.I.C.R?
  10. I

    USA Distributing kitchen appliances between circuits

    We're renovating our kitchen, and I have parts of the wall open and can rewire circuits right now if needed. We currently have three 20A circuits serving the kitchen, as follows: *Circuit 1: fridge, microwave, toaster, outlets. *Circuit 2: disposal, beverage cooler (5 cu. ft. mini fridge)...
  11. R

    USA How Many Circuits for basement

    I’m working to wire my basement. I’ve been researching codes, pulled my permit, and have discussed my project with the inspector. With this being a basement I know I will need GFI breakers. First question, can I put lights on these same circuits? Second how should I break up my circuits...
  12. F

    How many circuits do I have

    I want to get an EICR on my house, the cost seems to be based on how many circuits I have - what do I do to find out how many circuits I have?
  13. D

    Adding a dimmer to light switch controlled by two circuits

    I have a light switch in the island in my kitchen which powers two chandeliers located above the island. In order to cut the power on/off for this light switch I must cut off two circuit breakers (numbers 25 and 29) located in the breaker box. Also controlled by breakers 25 & 29 is the front...
  14. G

    Curr/Volt profile in circuits with Drop-in T8 LED Replacements vs normal T8 Fluorescent?

    Hi, I'm troubleshooting a 'smart switch' issue which is connected to an existing fluorescent 4' 2-bulb (T8) fixture where I have replaced the fluorescent tubes with LED drop-in LED T8 tubes (no re-wiring necessary, so ballast is still in the circuit). Vendor indicates that the switch may be...
  15. Calebp43

    What size cable do you use for new lighting circuits?

    So im a third year apprentice and should be qualified next year (whoopee). One thing has always made me curious and that is what cable size should we be using to rewire or in a new build for lighting in 2021? OF COURSE this depends on the load and how it's installed etc but in general what size...
  16. M

    Control one light from two circuits

    I have four exterior 110v light fixtures in the front of my house in series on a single switch. On a different circuit, I have six 110v back yard light fixtures in parallel on a single switch. I want to add another light fixture on the side of the house that will turn on if either or both...
  17. J

    Lighting circuits and having multiple legs of of a ceiling rose

    I have two questions regarding lighting circuits. The first in is , is it bad practice to put two lighting circuits on on breaker? The second is similar but can you ‘spur’ of a ceiling rose which is mid run of the circuit as many times as you want considering VD and maximum current draw/Zs...
  18. M

    Can 4 30A circuits run a heater with 2 60A inputs?

    Pictured is the L1/L2 terminal block of a 28kW tankless heater. The heater has 4 30A heating circuits connected to the terminal block, two leads per terminal. The other side of the terminal is supposed to be fed by 2 60A circuits, each powering 2 heater circuits. Is there any concern about...
  19. K

    USA Wiring Off-grid circuits to a solar generator?

    Hi all. I'm looking for advice on how best (i.e. 1- not a fire hazard, 2- meets code) to connect a solar generator to wiring for an offgrid cabin. Cabin (not yet built) will be 200-500 square feet. Only anticipate needing 3 circuits- 1 for a mini-fridge/freezer, 1 for a few overhead...
  20. E

    Low voltage over several circuits?

    I extended a bedroom in my basement and had to move a couple outlets from the knocked down wall to the new wall. After, I was sanding down the drywall mud and forgot to completely shut the door of the main panel (which is in the corner of the room). Soon after, I went upstairs and noticed the...

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