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conductor

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  1. Tuttle

    Main Protective Bonding (Domestic CU Change, TN-S supply)

    I've gone around in circles several times on this and I'm still not completely sure what the answer is ... generally speaking, when changing a domestic CU in a house that has a TN-S supply and 6mm2 main bonding (which is in good condition) is it necessary to upgrade the main bonding to 10mm2? I...
  2. S

    Continuity of neutral conductor

    This won't be the first daft posting of mine, but apparently once you get up to 20 postings you get additional privileges. So please treat me with contempt. When testing a radial circuit you establish continuity of the Line and earth when you measure R1+R2. What test ensures continuity of the...
  3. S

    Undersize Earth Conductor

    Hi, just carrying out a PIR, and the equipotential bonding conductor is about 4mm rather than the 16mm required. The socket circuits are RCD protected. My question is, what code would you put this down as? I put it as a code 2. But should it be a 4? Should this be upgraded immediately? Thanks...
  4. I

    do you still need to contact DNO when exporting TNCS earth

    hi dont want to open the usual debate re tncs earth, looking for where i can find out the answer as to weather the DNO still needs to give permission for there earth to be exported any one help ?
  5. S

    16mm Earth main protective conductor

    Hi everyone, Just a quick question I hope I can get some advise on. Saw a 1 bedroom purpose built 1st floor flat last night that is in need of a rewire. The consumer unit is the old rewire-able type with 16mm T&E on supply side. Although its red and black on the 16mm, it does look newish (10...
  6. T

    earthing conductor

    Hi all quick question.... mains board has 16mm earth cable leaving board and been told there is a connector block joining 16mm to 2 x 10mm earth cable which then terminates at tnc-s system.If Ze is within limits does this conform to current regs???
  7. Top Cat

    Little table for CPC sizes in 2 & 3 conductor cables

    Do not know if this has been done before but i find it useful as am always forgetting. 1.0mm cable has 1.0mm CPC 1.5mm cable has 1.0mm CPC 2.5mm cable has 1.5mm CPC 4.0mm cable has 1.5mm CPC 6.0mm cable has 2.5mm CPC 10.0mm cable has 4.0mm CPC 16.0mm cable has 6.0mm CPC
  8. I

    seperate bonding conductor

    hi when running a 10mm bonding( seperate to the cpc proctected distribution circuit) conductor for a pme supply to a detached garage that contains (water/gas services) is it ok to run from exisitng house cu to gargae cu and then bond the services to garage cu. or does the bonding conductor have...
  9. J

    Tt earthing conductor max length

    Hi All, Is there a maximum length for an earthing conductor, which is connected to the earthrod in a TT installation? If so, does anybody know what the max length please?
  10. K

    Rcd tripping

    Should the rcd trip everytime if somebody had softly touched the live core of a cable? Or does it depend on wha current is flowing?
  11. A

    Lightning conductor repair on a Church

    Its beyond my scope, so do ant of you fellas know who does such work in East Kent? A 10metre section of bare stranded copper has been nicked, this heads off into the heavens directly to the spire & its a long long way up.
  12. La Poste

    Seven stranded conductor conundrum

    Greetings. I am trying to figure out a certain size of cable that has seven strands on line, neutral and CPC respectively. It has red and black insulation on line and neutral conductors, the CPC is coloured green (I think but am not sure yet), it is steel wire armoured. I have found this...
  13. R

    what code for a under sized armouring as a main bonding conductor

    hi what code do you think should be atributed to a 2 core SWA cable used as part of a Main bonding conductor the steel Csa equivelent required is 64mm sq and the current 2 core 25mm sq swa is a BS 6346 with a steel csa of 60mm sq the above info on the required CSA is from the ESC technial...
  14. D

    Protective conductor size... 2 contradicting regs?

    Been reading up on the regs regarding protective conductors and doing a few calculations for imaginary circuits. What is the point in having Table 54.7 in 543.1.4 if the values contradict those calculated using the adiabatic equation are much lower? Is 54.7 just there as a time saver so you...
  15. 1Justin

    TN-S inadequate earthing conductor

    Hi. I have come across this ~3mm dia earthing conductor soldered to the PE sheath on a TN_S system. Previous electrician replaced the CU and bonding but left this as is. I'm sure it should not have been left this way. Incoming cable looks like a lead sheath and I gather it might be paper...
  16. D

    Cooker hood - can I run it from the cooker switch?

    Hi chaps, Very quick one for you. I know I have to have an easily accessible switch for fixed kitchen equipment like the cooker hood, but can this be shared with another item of equipment? Going to have a standard double pole cooker switch for the built in oven, but wondered if I can also run...
  17. H

    Query in use of grounding conductor

    Hello every body We r running bare aluminium tape in the concrete parallel to rebar of the column for grounding purpose from top to bottom of the building. Is there any chance of galvanic action between aluminium and rebar? If so than is this advisable to conceal the aluminium tape in the PVC...

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