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  1. O

    Current and voltage relationship

    Building site transformers are also centre tapped. So the voltage from live to earth (or neutral to earth ) would only be 55v.
  2. O

    3 phase board converted to single phase

    It shouldn't be a problem as long as the supply to it is big enough to cope with the load (allowing for diversity).
  3. O

    Pyro

    I've got to be honest I love a bit of it. I can't believe they are calling it specialist these days.
  4. O

    ZE at board/earthing alternatives

    Going back to the bosses comments it is permissible to use an extraneous conductive parts as protective conductors.....I don't make the rules. 543.2.6. I think there would need to be a bit more investigation than "just take an earth from the nearest girder" P.S. I have never done it and hope...
  5. O

    How many flats from a 60A meter

    A 60 amp b 1361 fuse will take 100amps permanently and not blow. Check out the adiabatic curves in the BRB. It will take 200 amps for over a minute.
  6. O

    RE-17th upgrade

    So is it time to become more like "gas safe"????? (Each part seperate) Each discipline seperate. e.g Safety (required by all engineers) Domestic installation. Industrial instalation. Fire alarms. Intruder alarms. Data cabling. Testing & certification (competency required for each discipline)...
  7. O

    Lightning Protection Noise on earth rod

    Is the lightning protection connected to the main earthing terminal or seperate? Is it possible to isolate the power to the cabins, and then try? I'm guessing it's all generators out there, if so are they close to the installation?
  8. O

    RE-17th upgrade

    I agree totally. Why is it that anyone at all can take the 17th edition course. Any time you see someone calling themself a "17th edition electrician" this usually means they have no other qualificaions!
  9. O

    Lightning Protection Noise on earth rod

    I would start by checking all the connections above ground for corrosion and tightness, and hope to find something. I've only used the clamp on meters a few times, but I have found when testing indvidual spikes with a standard meter it's pays to use the rest of the installation as your test...
  10. O

    i have seen it all now!!

    Looks like an up market lap dancing set up to me....! No wonder they charge so much. (not that I know.......ooops!)
  11. O

    neutral sizing

    Fair play he listened and learned from it. Don't ever be afraid to be wrong, if you don't understand ASK. It's all about learning.(but I admit I hated school!)
  12. O

    Spare rcd

    What qualifictions did the "electrician" claim to have? I don't blame your boss/company for taking him on, and I admire them for getting shut of him but how did he manage to talk himself into the job?
  13. O

    Arggghhhh NVQ or not to NVQ, ECS Card or no ECS Card??

    In this case voltage is the constant..230v from phase to neutral/earth, the impedance is what will determin the current flow, and hence the potential danger.!
  14. O

    what van/vehicle?

    No probs if you don't want to get up to the speed limit...I had on once and it's not nice being overtaken by a six year old on a hair dryer.! BTW mine was an ex BT and I was told they were restricted.
  15. O

    Tripping rcd

    I would guess that the neutral as been borrowed for the two way switching for the landing.
  16. O

    Tripping rcd

    Sounds like a borrowed neutral. What circuit was on the mcb that you moved?
  17. O

    tray carrying swa

    I would of thought that cable tray was an exposed conductive part rather than an extraneous conductive part and would require bonding. It is part of the electrical wiring system and therefore is classed as electrrical equipment!
  18. O

    Ring Circuit testing

    Have you proved the continuity of the ring yet? If not you might be breaking the ring in a second place and disconnecting the fault.
  19. O

    Crossed tails.

    I've come across the same thing before. I was replacing a shower switch, flicked off the mcb, the neon on the switch went off thought I would put my testers across it just to look good in front of the customer and I'm glad I did...! Found the tails crossed in the CU, swapped them over and then...
  20. O

    Can I do this..... go my doubts...?

    Could you not use the ring circuit to power the light and fan in the bathroom(fused down at the switch) then there is only 1 circuit in the switch.

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