conductors | Page 6

conductors

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  1. C

    Cable factors in trunking, conductors over 25mm^2.

    Hi All, I have been searching the forum but can't find this anywhere. Can you please see if my interpretation of this is correct: 50x50 trunking, 2m run with 1 90o bend. 4 x 50mm conductors, 1 x 35mm conductor. As there are no factors for over 25mm2 I have to work it out manually 50x50 =...
  2. R

    IR between live conductors & Earth

    When carrying out the test mentioned above what do you guys find the easiest and quickest when doing it on the whole installation ?
  3. A

    continuity of radial circuit conductors

    Hi doing R1 + R2 on lighting circuit green probe on cpc Red probe on Switch line (switch ON) or Line.Which is correct? Switch line to confirm polarity? .took readings on both .why is switch line reading higher. Thank you for any replies. Angus
  4. ringer

    Continuity of ring final circuit conductors

    Why is it when you cross connect the conductors at each leg and then test continuity, the result is one quarter of the combined resistances of the legs? I am usually pretty good at seeing how/why calculations work out, but just cannot in this case get my head around why the value measured is a...
  5. P

    min csa of live conductors

    hello peeps, I could do with some help. And i will greatly be appricated to egt the help. What is the min CSA of live conductors suitable for CCC and voltage drop for the following: a. 3kw, 230v water heater b. 11kw, 400v MIG welder c. 12kw, 400v three phase machine d. 5kw, 400v three phase...
  6. P

    Protective Conductors Continuity

    Hi Guys and Dolls In my 2004 edition of the IEE Inspection and Testing Guidance Note 3, page 78, Protective conductor continuity can be confirmed with an Earth fault loop impedence test (R1 + R2 or R2 is not required to be measured). (Note 4) Ring circuit continuity also does not have to be...
  7. E

    Old Twin and earth conductors and cpc?

    Hello, This is the first time iv came across anything like this and i went to quote this fuseboard for a upgrade yesterday and had a look inside and did all the required testing and inspecting and said id get back to them with a date when i can do the installation but came across one slight...
  8. C

    Main Protective Bonding, 1 or 2 conductors?

    I had a search with no joy. I am trying to find a reg to state if its ok or not to use 1 continues 10mm conductor for gas and water Main Protective Bonding . Having a look at a new CU install where there is no MPB and lighting CPC at all . Fun Fun Fun :clap:Thanks
  9. S

    Test Sheet guide

    Both Basic & Fault Protection SELV – if anything is provided by SELV, this gets a tick, otherwise N/A. Examples would be 12v extractor fan or 12v downlights PELV – if anything is fed from a PELV supply Double Insulation – Anything double insulated, i.e light fittings etc. These may also have...
  10. P

    some help explaining earth fault for fault finding project

    this is what i have down at the moment.......is there anything that you guys would add? An earth fault is the most common fault in electrical circuits. An earth fault may consist of a circuit breaker tripping, a fuse blowing, or an RCD (neutral to earth) instantly or it may not re-engage. The...
  11. S

    testing neutral conductors

    Had another dispute with who i was working with today, with testing an new installation. Here goes I always thought that the proper testing sequence is R1+R2, continuity of bonding, insulation resistance. Then ze, then zs. rcd But the person i was working with today told me i should always...
  12. Z

    Fluor fitting tripping lighting circuit, help needed

    Replaced an old fuorescent strip light with new fitting as old one was tripping lighting circuit. Problem still there, wiring looks fine. Tee puzzling thing is it trips when you switch the strip light off. Swiching it on is fine! Any ideas?
  13. R

    Parallel Conductors.

    Going slightly off piste on my D&V Project again. I'm thinking of running parallel conductors for an electric gate supply 'just to learn about it'. After reading the BGB it seems quite simple, in that the sum of two smaller cables will be the Iz of the circuit as long as the cables are roughly...
  14. A

    Protective bonding conductors in a flat?

    I've just been to a flat tonight to look at some potential work, but there is no bonding conductor to the incoming water pipe inside the flat. I had a quick look in the main distribution board cupboard of the flats, but could see no evidence of bonding to the water, and the main water incomer to...
  15. S

    earthing conductors

    hello can anyone help me all i want to know is are 4mm main earth and main bonding conductors ok? as in passing a periodic inspection? its a tns external is 0.06 ohms pfc is 2.9ka talis are 25 mm and it has an 30ma rcd main switch i always asumed to minimum was 6mm but someone is questioning...
  16. J

    Radial circuit, should branches be avoided

    On a new circuit (radial) should branches be avoided?
  17. J

    Radial socket circuit - duplicate protective conductors

    On a radial circuit, do all sockets require duplicate protective conductors back to the cu.
  18. J

    Sizing bonding conductors

    Hi guys, i have a question what size of bonding conductor is required for A shed that has a 63 amp 3 phase( 25mm2 swa) supply going to it. It is supplied from the main building that has a 400 amp TN-S 400mm supply . hust want to see if you have the same answer
  19. L

    3 line conductors in same protective device

    Is there any reg or scenario where it is acceptable to have 3 line conductors in the same 32A 60898 protective conductor ? Still ascertaining wheter two of which are a ring final but if they are is there some way that is allowed ? A RFC and a another Fused spur circuit in the same protective...
  20. H

    help on pirs

    Hi all, Completed my first pir yesterday (: now this client has got a three phase supply, TNS which feeds a ground floor shop and a flat above, the flat has a on peak and off peak supply. With the tails for the flat going into two kmf switches with a sub main cable of only csa of 10mm T+E for...

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