conductor | Page 7

conductor

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  1. uksparks

    Using CPC as live conductor.... ok i know, but...

    Hi, Had to change a bathroom fan at the weekend for someone and they wanted it to be on a timer, but couldnt as the cable was buried in the wall and wouldn't move etc.. the cable that fed it was a three core flex, I the earth was not being used anyway due to the load on the end etc. I know...
  2. M

    Mains on 3-phase DB

    Hi I am working in a hotel and I found that a 3-phase DB was fed by 2 seperate swa cables one containing the 3 phases and the other a seperate neutral and earth I know this is bad practice but can someone tell me why the NIC firm have picked this ad a fault I would not have done this myself it...
  3. F

    Solid Aluminium conductor twin and earth tabulated Zs values?

    Hello, Board change today (domestic), cable is aluminium twin and earth - socket ring = 4mm/1.5mm, lighting = 1mm/1mm, oven 10mm/4mm IR all good, continuity & Zs are within values set for copper equivalents. This is not tinned copper. I have managed to find out that this cable was used...
  4. HappyHippyDad

    Gas and water bonded together with a broken conductor?

    Evening everyone.. I have just undertaken an EICR and there is 6mm bonding to both water and gas at the correct points (within 600mm of entering building), however they must be joined somewhere as there is only one 6mm in the CU. I believe this would be ok if the conductor was unbroken but...
  5. P

    Outbuilding Submain

    An outbuilding is fed from a separate single way board in the house and has a 2c 4mm SWA to the building of 7m. Its a TNS. This outbuilding has its own water main (albeit in plastic) which comes directly from the water meter not through the house. Testing between copper pipes below the sink and...
  6. S

    Church lightning conductor

    Hi all , my local church warden has asked about the testing of the lightning conductor as part of a general checkover of the electrical system , told him I would find out on here ! Is this a "special test" that has to be carried out by installers of the conductors or can I do basics such as...
  7. F

    Main earthing conductor stolen?

    Was doing an EICR yesterday at a block of flats, was taking my ZE @DB and could not get a reading, so went to the external meter box to find that 6" of the earthing conductor from the neutral cut out had been cut out (Stolen?) I looked in the other 4 flats meter boxes and all but 1 had the same...
  8. B

    Earthing conductor also bonding the water...is this allowed?...

    The EC appears to be clamped to the water pipe just before going outside to the spike. Was this ever standard? Its a TT with Ze of 36 ohms. Is it best practice to run a separate EC and water bod to MET. (no gas in house).
  9. G

    Installation of Lightning Protection

    Hi, I own a top floor apartment in Swansea. The lightning conductor above the roof of the apartment block runs through a channel along the edge of the roof which is permanently flooded with rain water (except after long dry periods) to a depth of 25-75mm. This doesn't seem safe to me. I would be...
  10. W

    Main Protective Bonding Conductor, Where To Connect

    We are testing a very large production plant with multiple Air Handling Systems with multiple ductings fed from each system, all systems are fed from the same sub-station package, would we have to connect to each ducting service to satisfy a "tick in the box" under services bonded, we have...
  11. P

    Main Earthing Conductor current

    Being inquisitive this afternoon I decided to put my clamp meter on the main earthing conductor of a large commercial electrical installation I'm on at the moment. The supply is 2500A, with leakage measured on main incoming Earthing conductor to METwas nearly 5 amps. Any thoughts?
  12. Pete999

    Lightning conductor bonding

    Always bothered me when bonding the Earthing system in a building to the lightning conductor installation, it seemed odd to me. I went to Elex today and attended an NICEIC seminar about earthing, apparently Tony Cable is saying it's OK as long as you install a surge protector unit between the...
  13. A

    Earthing Conductor to dual tariff CUs

    Hi all I am looking for ideas for best practice for Earthing Conductors to a dual tariff CU. Should two 16mm Earthing Conductors from the MET be installed, one to each earthing busbar? Or one earthing conductor to one of the earthing busbars and a link of 16mm to the 2nd earthing busbar...
  14. P

    6mm main earthing conductor and main bonding conductors

    Been asked to install an extractor in bathroom. Installing 30mA rcd spur outside covering all lighting and ext fan. Obviously notify building control and installation cert. what's people's opinions of listing as a departure from bs7671 on installation cert. obviously recommend upgrade to 16mm...
  15. E

    does swa need additional protective conductor

    I need to work out if I will be required to run a separate protective conductor along side the swa cable I'm going to install. The cable is a sub mains feeding a 3 phase db panel in a large workshop. The cable is going to be a 50mm 4core 120 metres steel wire armoured installed in a underground...
  16. HappyHippyDad

    Regulation 434.5.2 Fault current!

    Cant quite get my head around how you use this reg? Lets say S =16 I = 657 k = 115 You have to work out t first of all so t = K2S2/I2 so t = 7.843409 (to 6dp) therfore K2S2 = 3385600 The reg says that we need to make sure that K2S2 is greater than the value of the let through energy...
  17. A

    Protective conductor size?

    Hi In commercial location I need to run 8 individual RCD protected circuits to 8 D/Skt outlets, each run is in 2.5 singles in plastic conduit about 20m max in length. My question is can I run a single cable earth ring to each skt and if so what size should it be, Worst case is all 8 skts...
  18. J

    Main Supply Conductor question

    Was asked a question today and want to confirm my findings after reading the regs we have a 1000A main supply (1000A ACB ) and from this we have 2 sets of supply conductors, 1 goes to a 600A Panel Board the other to a 400A Panel board with the tails being contained in a metal trunking, we plan...
  19. S

    Switched live in fan

    hi, Just reading through 'Connections' (ELECSA's magazine). Found an article saying it was aright to use the green/yellow for a SL in a class II fan if you sleeved it both ends with a brown sleeve. They cited 514.4.3 which in my book refers to PEN conductors saying it overrides 514.4.2 (thou...
  20. BigSi

    NICEIC Certification Scheme NICEIC’s Connection magazine (using CPC as a live conductor)?

    I was reading the latest issue of the NICEIC’s Connection magazine, when came across an article about wiring extractor fans. I didn’t read it in depth (was in the library at the time!!!), but from what I can gather you can now use the cpc in a flex (flex only, not hard wired) as a live conductor...

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