conductors | Page 4

conductors

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  1. C

    Split load RCD woes

    The usual C.U. change problem. All circuits working except one (Ostensibly a ring circuit, once upon a time. It 'end-to-end's at the board) which seems to have a neutral to earth fault. I was methodical so I don't believe any neutral conductors were misplaced, but even putting the two...
  2. B

    Can you calculate ring final conductors if you have a measured R1 + R2?

    Hello there everyone, I've dead tested some ring mains on a job recently but unfortunately I didn't do my measured end to ends. The circuits only have two spurs on each. I have my R1 + R2's, it was wired in 4mm T and E so the earth is obviously 1.5mm. For example, if one circuit measured...
  3. H

    Identification of Conductors

    Just got my head in the bible at the minute, and looking at 514.3.2: "Every core of a cable shall be identifiable at its terminations and preferably throughout its length..." Is this not technically an infringement when using twin brown for switch wire?
  4. O

    Paralleling conductors

    Just bouncing something off people here.. Got a job on, customer currently has a single phase 230v 16Amp commando socket he wants changed for a 32A ( Seemingly has a few machines in mind with a larger than 16A draw but below the full 32 that he's considering buying in...hasn't decided which yet...
  5. R

    Crimping of flexible conductors

    Hi Guys Is there any regulations or guidance on whether to use indent crimpers or hex crimpers?
  6. C

    Major works notification

    Hi, I've changed a consumer unit for a customer but noticed the earth and bonding conductors were undersized at 6mm csa. Do I put this down as a departure from 7671 or not issue to cert until the problem is rectified? Thanks Chris
  7. C

    Use of tie wraps and bunching conductors in DB's

    Hello all, I am told that this is no longer permissible under the 17th edition or one of its amendments. This argument seems to have been going on for some time now. I have the red book but not the amended editions and have not found a specific regulation relating to it there. Of course, I...
  8. W

    Crimping compacted conductors

    Hi - how does everyone get on crimping these compacted conductors. they are way smaller diameter than standard equivalent size. Icould get a 25mmlugonto a 35mm conductor. whats best practise?
  9. C

    parallel conductors and neutral switching of through contactors in lighting circuits

    Hi guys, I have come across two problems today well acutely three so I will list them first.. 1st Testing a 4mm radial circuit today or so I thought! I asked the young lad to go to the end of line and take an r1+r2 reading. When he opened up the last point he said that there were four 2.5...
  10. A

    Determining CSA of tails and sub mains

    So how do you guys determine the size of existing tails and sub main conductors when carrying out EICR or surveys. The reason I ask is, today I have been looking through some EICR and the conductor size stated of some of tails and sub mains is different to what I thought just by having a quick...
  11. S

    Funny readings continuity of protective conductors

    I'm doing an continuity test on a lighting circuit and I'm getting funny readings I'm putting on test lead on earth and one on switch live then I'm getting a reading of around 1.4 ohms but then when I'm checking the polarity it's shooting up to around 93 ohms but not breaking the circuit as you...
  12. J

    testing ze on a shared supply cable.

    Hi guys I done a quick search but could not find a answer, earthing system in question is TN-S. Supply cable comes in is terminated into two 1361 cut outs and then one set tails then go through to next door into another 1361. Am I wrong in believing that in order to test ze properly the next...
  13. G

    Dead short between 3 conductors

    What reasons can anyone think of why a circuit would have a dead short across all 3 conductors ? so far I'm thinking - water damage - possible rodent / pest damage any more ?
  14. J

    Main Protective Bonding Conductors

    Hi all. Could someone with better understanding help clear this up for me please; In the Regs (544) there appears to be no value of resistance for the above and also states that if copper, need not exceed csa of 25mm2. In GN3 it talks about using a value of 0.05 ohms for verification of bonding...
  15. M

    Question about testing

    Can somebody help im going to take my 2394 in February and as far as filling out certificates and sequence of tests im not too bad, but as im still a student and still learning im just a little unsure on a few tests and why there within a certain sequence. So why do you check continuity of...
  16. Gnasher

    Conductors not connected

    Can anybody give the reg number that states that any conductor not connected whether in a multi core cable or single in a containment system should be connected to earth. I may be wrong but as far as I am aware this is good practice and there is no reg stating it should be done. Looking...
  17. R

    what are your tricks of the trade

    Hi guys Just a bored sparks with very little on this evening. Might be a boring or repeated thread if so I apologise in advance. If anyone was to ask you what is your best trick of the trade what would it be? Simple, complicated, down right odd, anything that gets you out of a hole or just a...
  18. E

    Dedicated 32a2.5mm rfc for underfloor heating

    Hello all, doing rewire at the moment and i have pit underfloor heating on dedicated ring to save cable. No reason why not right? Conductors in parallel and all that. Not using fcu's just using stat as DP isolator. 7 zones/stats. Design current ok with Ref method B. Am I doing the right...
  19. 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...
  20. P

    no earthing or bonding conductors

    Hi all, a friend of mine asked me to have a quick look at her electrics as she had been told by the gas engineer that there was no evidence of protective bonding at the gas meter. I looked in the cupboard to find a met with only two cables attached, one green/yellow and one just green, the...

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