circuits

  1. mak

    Is there a max Zs for lighting circuits?

    I can't find anything related to this in the regs so I probably misunderstood the question. The way I see it the max Zs for any lighting circuit depends on the circuit breaker for that circuit. Say we have a lighting circuit with 100x36W ceiling lights which gives us a load of 16A, we choose the...
    • mak
    • Thread
    • circuit circuits confused earth fault impedance lighting loop loop impedance max radial types
    • Replies: 7
    • Forum: UK Electrical Forum
  2. EricMark

    Isolated circuits and the EICR are they included?

    If some one drops tails or locks off a circuit for any reason, be it faulty or simply not used, is it tested or reported on an EICR? In other words if a landlord knows a circuit would get a C1 or C2 and he decommissions it before the test then recommissions it after is there something we should...
  3. EastCoastPete

    Lead sheathed 2 core lighting circuits /EIC

    Evening All, I'm changing a CU from rewirable to 6 x RCBO in a Victorian flat. The two lighting circuits are lead sheathed 2 core, they appear physically undamaged though I've yet to test them but is this an automatic EIC fail? The switches and pendants are all plastic. Thanks for any pointers, Pete
  4. D

    EICR Certificate not issued. Not all circuits RCD protected rated C2

    Hello, I've recently had an EICR done on my 2 bed house which is a residential let. This house is about 25 years old built by Charles Church. The EICR has not been issued due do C2's, there were no C1's Email with C2s ratings for 1) Not all circuits RCD protected, 2) Bathroom light is a bare...
  5. N

    New Circuits from a shed DB

    Hi guys, I'd appreciate the opportunity to pick your brains a bit, and make sure I'm on the right track, please. (Will also be talking to my course tutor) I'm currently studying for my NVQ lvl 3, and an opportunity has come up for me to do work which may be good for my portfolio. I'm a...
  6. L

    Domestic heat/smoke alarm mains powered from different lighting circuits?

    Hi folks, Friend is currently renovating his house, including a loft conversion. He had originally hoped to go with Grade F1 (tamper proof batteries) radio interlinked alarms. However architect has stipulated all alarms must be Grade D (mains powered with battery back-up), but can be still be...
  7. P

    Two or more circuits in a junction box (521.8.3)

    When looking up a reference on another thread I noticed rule 521.8.3 that says "Where two or more circuits are terminated in a single junction box this shall comply with BS EN 60670-22" and it got me wondering what BS EN 60670-22 actually says that has an implication for two or more circuits...
  8. P

    UK Lighting circuits

    Just interested to know the most common method of wiring lighting circuits. My dad always went down the JB route. I prefer looping in/out at the ceiling rose, but am finding many are now looping from switch to switch. Any thoughts chaps?
  9. N

    Correct grounding of metal junction box w/splices for 3 circuits

    I have 3 circuits (microwave, disposal, and dishwasher) entering a metal box where the THHN wire will be spliced to Romex. I spent half an hour reading 2020 NEC Article 250 but didn't see multiple circuits specifically addressed. To ground the box do I just need to pigtail off of one circuit's...
  10. J

    C&GLevel 2365 - mock circuits

    Hey everyone, I'm looking to start the city and guilds level 2 2365 course soon (home study). And just wondering what circuits I will be required to build. I've seen plenty of these GSH YouTube videos where the students have mocked up circuits on sheets of OSB so I wanna get practicing for the...
  11. Devil7

    Sub mains / distribution circuits

    Hi all, new here, just looking for a few pointers. I'm not doing this, just keeping my brain active in these weird times with things i've not learnt yet. How do you calculate cables etc for a single phase sub main (to a garage for instance) - is it the same as a cooker? Ib> In> etc etc?? TIA
  12. D

    How is this switch powered? I thought all circuits needed a neutral?

    Usual problem with smart switches - no neutral at the switch, been plenty of threads on it before. Fortunately managed to find some switches that don't need one. So the circuit's permanently 'complete' since the switch is permanently 'on', and actually power is going to the light, but not...
  13. I

    Borrowed neutral / RCD trips but circuits still live ?!

    I’m just a homeowner, so please forgive me if my question sounds stupid .... i think the lights in the hall of my small bungalow are using a borrowed neutral. I recently went to fit a new light on the ceiling in the hall using the existing connections and turned off the MCB that said “Hall...
  14. happysteve

    Restoring circuits after temporary "distress change"

    Am currently pondering the following situation: - Single phase PVC board, domestic, in an area where TN-C-S is the norm (underground supply etc). - Most circuits protected by 30mA RCD, except lights (B6 60898 MCBs). - Pre-checks before simple job (on garage circuit) reveal no earthing...
  15. CokeCanBrad

    UK Am2 Breaker Selection

    Hi I want too do my AM2 In the future. I want too know the breaker selection for the circuits in the AM2, an acceptable answer (for me.) will be from a recent am2 Passee (successful candidates only.). The circuits are as Follows:- D.O.L Starter, with motor. Carbon Monoxide Detector Ring Final...
  16. B

    Finishing Basement / Planning Circuits

    Goodevening Everyone - I need some advice and I appreciate your time to look at my question. I keep getting different opinions on this and I am struggling to get past the planning stage on the electrical portion of this project. I have read and heard it is wise to keep lights and outlets on...
  17. Iain Stewart

    How to plan a rewire and new consumer unit. How many circuits, what cost?

    Hi, we need some advice on our scenario with regards to our rewire plan. I will get this out of the way first... We are planning to put the house up for sale. I know people will say let the new buyer do the stuff but in our area there are a few houses for sale and they are all fairly up to...
  18. D

    New house unknown circuits

    Hi - I just moved into a new house. The box has a circuit labeled "Central Vac" and 2 labeled "Septic." The house does not have a central vacuum. I do have a septic system that as far as I know does not use a pump or any electrical power. Any idea why these circuits would be there?
  19. D

    Multiple Exterior Lighting Circuits

    Hi all, Having a brain fart... Looked at a job today, have multiple exterior lighting circuits (4x MCB'S). Can see why there is multiple, as previous electrician was worried about cable lengths etc as the property is quite large. But seem to have multiple Photocells and timers controlling...
  20. A

    No CPC in lighting circuits / Fire damage

    Good evening following a visual inspection in a property that had an electrical fire in the fuse board area obviously i could not actually test anything, but visually identified that the lighting circuits had no earth (not even cut back) now the insurance company ideally want a new...

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