conductors | Page 5

conductors

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  1. J

    Ir test on bs 3036 wylex board

    Hi all, l recently did a eicr on a fish and chip shop. 3 phases (only one phase in use by chip shop). Earth conductor is welded together to each phase by TN-S earthing system means. When it came to the IR test, l tested the norm tests, L-E, L-N & N-E. Bearing in mind that we are now supposed...
  2. I

    main bonding conductors

    hi can anyone tell me the what the maximum value of a main protective bonding conductor is
  3. B

    Old Stranded Steel conductors in house wiring.

    Hi. I visited a clients bungalow today as I am looking for some work to get registered by elecsa. The client wanted some new sockets fitted and after a quick check I noticed that he has no RCD protection for his ring main or his lighting. I then examined the wiring to find that it is the old...
  4. eNigMar

    Resistance/meter for copper conductors table

    I've been looking over the table in GN3 for the resistance of copper conductors per meter and there is something causing a form of OCD to manifest in me 'ead. It's obvious that if you double the length of a conductor it will double in resistance and if you halve it, it will halve in...
  5. M

    ID colours of Conductors

    Just a thought to put it out there. Why not make the coulours that ID our conductors more simple and standard. Way back when I did my appieyship in early to mid 70,s be as it may abroad. Apart from the earth [Green and yellow] then we only had 1 colour as standard and to ID and the was neutral...
  6. C

    Doubling Conductors

    Just wondering what people did. What cables do you double over? 1mm, 1.5mm, 2.5mm? single do you double over if theres two 1mm cables going into a fitting if its tight? Also how tight do you tighten 1mm or 1.5mm Is it easy to over tighten these? How about 2.5mm, i usually tighten 2.5 as much...
  7. S

    EICR Classification codes Main bonding

    Hello all, i failed a periodic inspection today and am still in debate with the client. He's obv not happy. An NICEIC registered electrician terminated the bonding into a metal back box of a socket outlet connected to the CPC of the radial s/o circuit. the regs say protective conductors for...
  8. S

    Size of Earthing/Bonding Conductors - Domestic Installation TN-C-S

    Hyperthetically. TN-C-S in a Domestic - Earthing Conductor 16mm. Bonding conductors 6mm. I understand that the bonding conductors must be not less that half the earthing conductors meaning the the 6mm bonding in this situation is too small but they are a pain in the backside to change...
  9. S

    Main Protective Conductors - Continuity and Connection Verified - Sighting Clamp

    Are there any circumstances when it might be acceptable to tick the "Continuity and Connection Verified" box of the Electrical Installation Certificate when there is no visual or physical access to the point at which the bonding (normally a clamp in domestic) is applied. If so what checks over...
  10. P

    CPC over heating

    I was called to a farm today as the RCBO protecting several 13amp sockets on a work bench kept tripping intermittantly. Upon removing the first socket (all metal clad twins fed in PVC conduit/egatube) I found that the 1.5mm CPC insulation had melted and welded itself to the neutral & live...
  11. J

    Really stupid voltage drop question

    Hey all, reading through the 17th trying to get my head around some areas of it. I did physics at school and some at uni so electrical calcs usualy dont bother me the slightest. BUT, If were calculating voltage drop over a reasonable length radial, for example twin and earth or SWA feeding a...
  12. B

    Ring final test from socket???

    I'll probably receive cries of abuse that this query was dealt with years ago but not when I was in the forum so........When testing ring can anybody think of a reason why the ring final tests (R1,R2 and Rn + link test) shouldn't be done from the back of a socket or other outlet on the ring. As...
  13. 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...
  14. kingeri

    Concealed bonding conductors

    Morning all. I'm about to set off to a cellar conversion. The gas, water and electric incomers are all in opposite corners of the cellar. In the next few days it's all going to be plasterboarded, which will conceal the bonding conductors permanently, although the actual earth clamps (i.e. the...
  15. vxwestie

    Leaving 6mm bonding conductors

    Been called out to an existing customer today where a 30amp Wylex fuse carrier had burnt out. After sorting that out i proceeded to talk to the client and ended up with the job of replacing the fuseboxes with MCB board. (currently 2 x 8way wylex units) After noting that the tails were ok and it...
  16. richardg

    First EICR help needed!

    Hi I have just finished the new 2394 course and thought I would perform a EICR on a friends house, little did I know what a state the installation is in. Any help or recommendations would be great as I have a lot to learn.The main consumer unit is around 20 years old with a mixture of 3871...
  17. 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...
  18. H

    Finding earth leakage on 3 phase supply cables?

    Hi. I've got a high earth leakage value on a main db supplying many 3phase cables. What's the best way to find the leakage values on each cable? Some of them can't be turned off. If I clamp around all 4 live conductors as they enter the db would this give me the earth leakage?
  19. edexlab

    two conductors into main isolator?

    I've got a question regarding whether its acceptable or not to connect two different sized conductors (or even two equal sized) into the terminals of a main isolator. this is the set up TNC-S 3 phase supply incomer 100A main fuses > 25mm tails into 100A (switchfuse) Main isolator >...
  20. 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...

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