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  1. T

    Bonding question

    Yes mate - not my work I might add! There's a single core attached to the armour used as a CPC into the fuse block.
  2. T

    Bonding question

    Alright folks, Looking for a bit of advice with supplementary bonding - pictures attached for context. Bit of background - I'm in the process of repairing some metal bollards: I decided the best option was to rip out the old guts which comprised of some old fluorescents complete with all the...
  3. T

    Advice on 461.2 needed

    Hi folks, Just need a bit of advice regarding whether or not neutrals require switching. - 3 phase board, 3 pole main switch, neutral is un-switched. 416.2 (ii) states that switching of the neutral is not required if the conductor is reliably connected to earth by a low resistance to meet the...
  4. T

    Main bonding to water question

    As I understand it, a resistance between extraneous/exposed of 0-1667 Ohms will be fine on RCD protected circuits, and a resistance of >22000 Ohms will be fine because they are sufficiently isolated from one another. The "dangerzone" is between 1667-22000 Ohms where bonding would be required. On...
  5. T

    Main bonding to water question

    Hi folks, Just wanted to check and see if bonding is required in this situation: There's no bond to water pipework, bond to gas all present and correct There is a piece of plastic pipe at the point where the water enters the building, probably around 100mm in length There is then a mix of...
  6. T

    3 phase design process

    Hi Andy, a big thanks for the reply, and yes a good point I hadn't considered there.. 6mm PVC should still do the job. T 1574171086 Hi West, thanks for the reply, you're probably right - I'll do some calcs for my own morbid curiosity - but thankfully I had nothing to do with that bit of the...
  7. T

    3 phase design process

    Hi folks, I'm installing a 3-ph 32A 60309 socket and just wanted to double check my design calcs are right... The circuit will be part of a 3-ph sub-board (200A main switch) supplied by our main 3-ph distribution board. The final circuit length is approx 30m. The sub board comprises just...
  8. T

    PFC measurement question

    Thanks for the reply mate - still fairly new to testing. T
  9. T

    PFC measurement question

    Hi folks, I'm carrying out an EICR on a 3-Ph board which cannot be isolated fully - only certain circuits at certain times. Supply protected by 3x 88-2 fuses. When carrying out PSCC/PFC, I'm getting a small spark at the probe on the neutral bar/MET intermittently. Can anyone explain this? The...
  10. T

    Zs and IR pitfalls

    Thanks Rob, that might explain it.
  11. T

    Zs and IR pitfalls

    Thanks for the input chaps, much appreciated.
  12. T

    Zs and IR pitfalls

    Hi folks, I'm still fairly new to testing having just passed my 2391 and just looking for a bit of advice if poss.. Quick bit of background - I'm carrying out EICRs on a wide range of single and 3 phase boards, inc. motors, lighting, power, micc, singles, swa etc. Any general pointers/tips...

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