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  1. J

    Socket and switch heights

    Maybe I am wrong, but not sure why car chargers come into it that note is just pointing out that bs7671 doesn't overrule building regs in general, presumably to prevent confusion where building regs are stricter you can't have a deviation from building regulations as they are statutory laws...
  2. J

    Socket and switch heights

    compliance or otherwise with Part M of the statutory building regs is entirely unrelated to compliance with BS7671. therefore recording that as a departure would be incorrect, as there is no BS7671 reg that you have not followed.
  3. J

    Extractor fans that don't need a fuse

    I thought the same from memory but after checking it doesn't seem to apply to overload current. Do manufacturers specify a 1362 fuse for overload protection eg shorted windings as well?
  4. J

    Extractor fans that don't need a fuse

    Are they run off a 6A lighting circuit? I know it doesn't answer your question, but EDIT I think I misremembered - 3A fuse operates quicker than 6A MCB for overload currents - 7A would blow a 3A fuse in 0.05 seconds but would take 3600 for the 6A MCB to trip. However although there's no need to...
  5. J

    Ideas welcome rcbo replacement

    This does sound grey area, you can swap as many as you like as long as you don't add new socket outlets, but converting a single to a double kind of adds a second outlet even if no extra accessory. Regarding the deviation, omission of rcd protection where it is required is not a deviation. A...
  6. J

    Ideas welcome rcbo replacement

    If it's not adding any new wiring or socket outlets why the requirement for rcd protection? Is that something the customer requested? If so they should pay for the cu change.
  7. J

    Socket and switch heights

    Part m is pretty clear. For a new dwelling that may be visited by persons of reduced mobility ie new build and conversion from non domestic, the heights are prescribed. For an existing, you aren't allowed to be less compliant after than you were before. For feelings designed for disabled people...
  8. J

    PFC reading of 8ka on domestic installation

    It's ok with a proper consumer unit backed up by a cutout fuse. The cutout fuse protects the MCB as it would also blow in the case of a short circuit outgoing the mcb. Ie no discrimination at high currents. Also the measured pscc can often end up higher than what would actually flow in these...
  9. J

    Regs question re socket access from bathroom

    It's hard to get discrimination between rcds, so both would trip in the event of a fault.
  10. J

    Regs question re socket access from bathroom

    If you're adding a new socket it has to be rcd protected regardless. And any new wiring that's buried in any walls.
  11. J

    Adding a circuit to a CU your not happy with

    Yep that's basically the definition of a circuit. See the other thread for a philosophical discussion. If you have two piles of sugar and you mix them together, how many piles of sugar do you have?
  12. J

    Regs question re socket access from bathroom

    If the socket is outside the bathroom you'e fine
  13. J

    New cable support regulation 521.10.202 (18th)

    If they had spent that half an hour reading the hants fire report instead of guessing they would realise that they don't have a clue what they're on about.
  14. J

    History of PME Systems.

    Would that not be obvious due to high resistance neutral? Yes no bonding would be dangerous
  15. J

    History of PME Systems.

    Lost n will be discovered very fast. Lost e would not be. So it makes sense to combine as long as you trust your equipotential zone and bonding. So you could say pme was a safety improvement, a bit like putting your smoke alarms on the lighting circuit. Has anyone got figures for death by pme...
  16. J

    Does this setup contravene any regs or is it ok?

    True, only thing is you're using the bs7671 definition but that only applies to fixed wiring. Make it an fcu and I'll agree ;)
  17. J

    Dodgy trade pictures for your amusement! - 1 Million Views!

    Sod that i wouldn't touch it, go home first let someone else get their fingers near it:eek:
  18. J

    Does this setup contravene any regs or is it ok?

    When assessing an installation you can only look at the current state, not imagine other designs it might have had in the past and decide if the structure of the installation was redefined in some way.
  19. J

    Does this setup contravene any regs or is it ok?

    you can run as many cables back to the CU as you can comfortably terminate, doesn't matter if one goes to the loft, one to the back of the house and one to the front of the house, it's as good as having a normal one dimensional radial. I like to improve my understanding of the regs, but this...
  20. J

    Max Zs on certification

    The purpose of a well designed form is to make sure you only have to think about one thing at a time. Therefore when filling it in you should do the full calculation, and when measuring the zs all you do is measure and fill in. Then to determine compliance you just compare the two without any...
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