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conductor

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  1. C

    Replacing Main Earthing Conductor

    This may be a newbies question but the older and wiser (or at least the more experienced) heads out there may be able to help.... Just inspected a clients house and amongst the, many, problems it only has a 6mm Main Earthing Conductor. I intend to upgrade it to 16mm but I can't see how to...
  2. B

    Zs testing on TT

    Hello all, Many Thanks to everyone on previous questions, I am new to forums generally but it sometimes feels like there's a big bus full of keen knowledgeable people outside that can answer any question! So todays question; Whilst doing some work at a house yesterday I found myself wondering...
  3. P

    Lightning Conductor

    if i have a conductor connected to the metalwork of the building how do get a test reading ?
  4. Baker1988

    resistance of line conductor

    hi i wanted to find out the resistance of line conductors, i have been looking in the new green onsite guide for the resistance of line conductors i have found in appendix I the resistance of r1+r2 but i wanted the resistance of the line conductors only can any one tell me where it says this as...
  5. F

    Earthing conductor and main bonding conductor clarification wanted please.

    Hello, please can anyone advise me to help decide what would be the best way to go with this earthing/bonding issue? I apologies in advance as I know there are many threads covering this, but they often deviate and do not always decisively conclude. I have been asked to upgrade an existing...
  6. Clark3169

    RCD's tripping with no current?

    Hi guys, I am helping a friend with extending the ring main and adding some lights etc... in his new bedroom. I have put in a few new sockets & some two way lighting etc... I have isolated the circuits by turning off the appropriate MCB's at the CU which is split and both sides are protected by...
  7. Floody

    Basic Testing

    Hi guys, brilliant new thred im sooooooo pleased this was set up I cant even begin to tell you. Ok, Testing. Im trying to find out the basic testing that needs to be done on all circuits. In college we are currently wiring lighting switches and ceiling roses. I can see the tutor lightly...
  8. S

    New CU, Bonding & Earthing conductor.

    Hi. I fit kitchens again now(fit Solar for a while inbetween), so most of my work is and has been done in kitchens. I have changed quite a few consumer units in the past - but never where it's a TT system. A customer I'm fitting a kitchen for this week asked me to change her consumer unit...
  9. A

    Main bonding conductors connected to trunking.

    Today i have been asked to give an independant opionion on electrical work undertaken by another electrician on a commercial property. There has been work done to "improve the mains bonding arrangments". The buildings supply is a 100a 3 Phase TN-C-S. Connection to this is by a 50mm2 single...
  10. R

    Functional Earthing conductor

    A question in the Electacourse home study 2382 is The colour of the functional earthing conductor is :- I answerd green /yellow .which occording to is Wrong ,they say Yellow, i have never heard of a colour for a earthing conductor, ? who is right
  11. A

    Voltage drop

    Hi i keep getting confused when trying to work out voltage drop please can some one point me in the right direction. 63amp boiler supply 25 meter run in plastic trunking fixed to wall. Will 16mm twin and earth be sufficent and can someone show the calculation cheers
  12. B

    IR testing ?

    Hello all just reading Professional Electrician and noticed this on IR testing. Just wondered if anyone else was aware of this,came in with 17th in 2008. It slipped by me.:dunce2: Live conductors and the protective conductor connected to the earthing arrangement. (Test 2) Regulation 612.3.1...
  13. K

    calculating csa of earthing conductor with BS1361 fuse

    Maybe I'm overlooking the obvious but how would you calculate the min. csa of an earthing conductor of say a tn-s system when there is no time/current graph for a 1361 fuse in the BGB? Do you just obtain If from Uo/Ze and then use this in the adiabetic equation. Ta
  14. R

    Earthing conductor csa/size (oh no, not that again I hear you cry)

    Firstly, appologies for raking this one up again. Although not new to electrical work the earthing arrangements in some properties, including my own, still mystify me. My home was built in 1997 by Bellway. It has a 60A service head with a 1361 fuse, is TNCS and has a PME sticker in place. The...
  15. S

    pir code for undersizes water bond

    hi .doing a test on a complex where the tails are 25mm ..main bond 16mm ..but the cable bonding main water is only 6mm..think the tails have been upgraded from original but not water bond (not a easy run) .there are 30 flats in complex ..what pir code would i put fo this
  16. N

    Regs on isolating a DB and earthing conductor size

    Just wanted to double check two regs. 1. Do you HAVE TO have a double pole switch between the cut out and the DB (so you can isolate the DB) 2. Do you HAVE TO have a 16mm earthing conductor alongside the 16mm tails (the load on the installation is no more than 5 amps ((teleco cabinet Virgin...
  17. J

    Live earth conductor

    Yesterday I was installing some downlighters in a bathroom, I isolated the supply tested L-N and it was dead, grabbed hold of the choc block which was used for the existing light, stuck my screwdriver in and got an electric shock. That was weird so tested again and it was still dead so I thought...
  18. albi

    Bonding to a lighting conductor

    Hi Boys andgirls Does any one have any idea on the size the bonding conductor should be to alighting conductor. Its for a small church, it is a TNS system single phase Ze 0.40Ώ and PFC0.575KA. The distance from the MET to the lighting conductor would be 60M away. If I understand this BS7671...
  19. R

    Max conductor size

    Hey all, anyone know the max conductor size for an mcb?
  20. T

    240V & CPC conductor

    I will make an installation for fire alarm system (detectors 240V supply with interlink between of each one) using single wires or pvc cable enclosure in pvc conduit or pvc trucking.The detectors have the symbol of double insulation with out any point for earth terminal and my question is if...

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