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  1. D

    New to Forum. Main Bonding conductor r2 readings.

    Hi New to the Forum here. I am a qualified Electrician however inexperienced due to spending 4 years in the army since finishing my apprenticeship. Trying my hardest to get back to the standard that I should be at. I have sat and passed the 17th edition but currently not got 2394/5. Plan to...
    • David Nicholls
    • Thread
    • bonding conductor main new readings
    • Replies: 2
    • Forum: The Welcome Forum
  2. HappyHippyDad

    Regulation 434.5.2 exceeding limiting temperature of conductor.

    Evening.. I have a seperate oven and hob to fit. The oven is 2.6kW, the hob is 3kW. I have fitted 4mm flex to the oven and the hob comes prewired with 2.5mm. Zs on the cooker circuit is 0.2Ω making the PFC 1150A. I was planning on connecting both to a dual cooker outlet plate fed by a 32A...
  3. E

    installing a sub board

    I have to provide power for 10 appliances.Each appliance will be provided with own mcb. The distribution board is 50 meter far away. So I will install a sub board in the room where the appliances will go.the sub board will be fed from the distribution board.If I install the subboard with a...
  4. T

    Water Bond size on outbuilding

    Evening all. Bit of an odd one this and I just wanted to run it past bigger brains than mine to make sure I'm not missing something obvious. A brand new PME supply is being brought across to a field which has got 3 outbuildings, all of which need lights and a couple of sockets. The supply...
    • The General
    • Thread
    • bonding building conductor earthing outbuilding size supply water water bond
    • Replies: 15
    • Forum: UK Electrical Forum
  5. B

    DNO earthing arrangement

    A big Hi to all on here, please be gentle with me it my fist time !! It's only a quick one but do the DNO have a legal requirement to supply suitable earthing at the point of origin of metered supply. many thanks advance
  6. C

    Fitting new CU to TT system and old BS fuse box

    Hi there, new to this site and just after a bit of advice. I am part qualified as a Domestic Electrical Installer and am just waiting for the course to complete my Part P. I have been asked to install a new Consumer Unit on a TT system in a very old cottage. As seen in the photographs, the...
  7. A

    4 submains with one common CPC

    I have a query. 4 distribution boards, each fed by 25mm2 double insulated tails (approx 30m away) in a roof void. Only 1 16mm2 earthing conductor for all 4 submains. The earthing conductor is then connected at the first board and looped to the other three boards. Is this acceptable? I thought BS...
    • atm84
    • Thread
    • common conductor cpc earthing mains separate supplied tails
    • Replies: 40
    • Forum: UK Electrical Forum
  8. S

    Instrument for Testing a Lightning Conductor

    Is it possible to test Lightning Conductor with an Earth Loop Impedance Tester ? Discuss . . . . . . . . .. .
  9. J

    Tns main protective bonding conductor csa

    Hi just checking the main protective bonding conductor size on a tns system, there are two supplys the tails sizes are both (630x2 the supply earth is 240 and neutral is 630x1) persupply designer aspecified main erthing conductorto met fothe main protective bonding as 2 x 240 i think this i...
  10. B

    Conductor size

    I'm doing the distance learning course to then do my approved electricians exam. The question being asked is. Determine by calculation the size of the main conductors between the main switch and the db. Including earth so it's a 100A supply ambient temp 25.c in 100x100 trunking distance...
  11. J

    Different cables having different conductor areas but same current rating?

    Why would two cables have the same current rating, but different conductor surface area? I'm looking at double insulated thin wall 2-core 25A multistrand cable. In one case the conductor area is 2mm^2, in the other it's 8.4mm^2. Is this a mistake by a supplier? Or maybe one cable has better...
    • Jodes
    • Thread
    • areas cables conductor current different having rating
    • Replies: 7
    • Forum: Auto Electrician Forum
  12. S

    Undersize earth conductor

    Carrying out an EICR and some minor works on a client's flat. This is a grnd floor flat in a converted victorian house. All the services go into the lobby of the basement flat. Water, gas and electrical meters are all there. The bonding is a bit flaky but easily rectified. Bonding, main...
  13. C

    cpc in pvc conduit?

    Hi all, I was testing an installation today and every thing seems to be in order till I found a piece of white pvc conduit with a single 2.5 brown cable in it with no cpc. The conduit had been installed to pick up a permanent feed to a PIR from an emergency light fitting. Both lights and the PIR...
  14. R

    Using Armour of SWA as a Bonding Conductor.

    Could any of you helpful lot on here give me a clear answer on the following. Can the armouring of a 70'c swa cable be used as a compliant protective bonding conductor? Looking at the actual size figures of armouring for 70'c swa cables and applying the equation 5.5 from page 55 of GN8 it works...
    • rattlehead85
    • Thread
    • armour bonding conductor swa using
    • Replies: 11
    • Forum: UK Electrical Forum
  15. akwoody2

    Board Change Questions

    So im looking to get certified with Stroma, signed up and my first job that I can use for the assessment is a board change. The only issue is it doesn't have bonding to the main water. Can I change the board and put the fact there is no bonding down under as an advisory? Thanks for your help...
  16. L

    RCD Not tripping when in contact with live conductor

    Hi All Please correct me if I'm wrong I was thought that an RCD should trip when you come In contact with a live conductor. Now I have had 2 electric shocks in the last 3 months and on both occasions and the RCD did not trip.The RCD was tested and passed. Any ideas ?
  17. J

    6mm earthing conductor

    Seen something today while performing a fire alarm test at a relatively sized office that struck me as strange. Thought there was no better place to query it than here. Like I said decent sized office, 3 phase tn-c-s supply can't really say too much more about the installation because this...
  18. D

    Main Protective Bonding Conductor

    Hi, testing a UNI with one main supply, which in turn feeds around 10 separate building. Each building as it own Gas supply with meter, so therefore a Protective Bonding Conductor to each incoming supply. Does the size of the cable have to correspond to the incoming supply size, or to the size...
  19. A

    live conductor

    Hello, I am studying to pass the 17th Edition and there is a question that i do not know. The following final circuit are to be installed using thermoplastic insulated multicore non-armoured cables 3x6A lighting 1x20A UPS supply 3x32A ring 1x40A cooker. If the cables are enclosed in a...
  20. S

    Bonding conductor

    Im doing some alterations in part of a school. I noticed a water stop cock that has no bonding conductor. Its not the main stop cock as that is another part of the school. I carried out an R2 from the local sub board i am working from and got 0.32. Am required to bond it to bring it within the...

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