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  1. J

    Advice on Lighting Circuit

    Those lighting sockets are designed for a single light only, due to the lack of overload protection you are not supposed to use splitters/multi way as all circuits that may be subject to an overload need suitable protection. This may be provided in the consumer unit at 6A or it could be 16A. It...
  2. J

    Why did the Ra go from 180Ω to 14Ω?

    That's impressive, how did you work out the location of the fault, was it something fancy like time domain reflection to find out the distance to the fault, or something less exotic like a mirror and steel tape?
  3. J

    Spiritual Earthing..

    You forgot fire, you'd need a gas pipepintoipe the mix too for that! That would be an extraneous conductive part so don't forget to bond it! Or move the bed to an outbuilding without an electricity supply or a different method of protection than ads.
  4. J

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

    That's no good i use 10 inch bolts right through to the other side of the wall Does mean you can see where the sockets are from outside the house
  5. J

    New Oven tripping mcb massively

    Thanks although @SparkyChick said it first! Glad you're hopefully going to get a working oven out of it.
  6. J

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

    that's horrific everything out the window there in terms of safety. whoever fitted that was probably dead proud of working out the loop in/out part, either that or trial and error at work
  7. J

    Help needed with understanding IR

    Thanks did not know that, sounds crazy to me but those standards writers must know that they're doing!
  8. J

    New Oven tripping mcb massively

    Yes my money is on casing as well. We bought a "seconds" oven cheap that was all dented on the external panels, goodness knows how looked like a fight with a fork lift. I took all the flimsy back and bottom panels off and straightened as best I could and inspected before powering the thing up...
  9. J

    Help needed with understanding IR

    there's no such thing as an overall IR failure, if you do the IR overall and it's >1mohm then that guarantees the whole installation is alright (subject to 2 way switching etc) as you can't have any circuit <1mohm if the global is >1mohm. That is a big time saver given that many installs would...
  10. J

    Help needed with understanding IR

    As above you can't accept a lower value than 1mohm on any part of the installation whether combined or not. If you measure 20 circuits and get 0.1mohm combined that could be a fault on one circuit. However if you break it down and they are all 1.5mohm then that's classed as ok.
  11. J

    Is this possible that neighbourhood swap a fuse connected to my apartment in staircase fusebox?

    Doubt it, all fuses have the same strength until they blow. No reason to swap it?
  12. J

    Recent Home Improvements....

    4 weekends and how many weekdays? ;)
  13. J

    Bonding Extraneous Conductive Parts

    I think what you're meaning is a situation where there's some kind of conductive item, completely within the equipotential zone (i.e. not extraneous) and not an exposed conductive part. This means that it is unrelated to the electrical installation. Since all live conductors must be double...
  14. J

    LOSING MONEY WHEN WALKING AWAY FROM BAD JOBS

    what a genius, now that's what I call lateral thinking!
  15. J

    Bonding Extraneous Conductive Parts

    the fault disconnection time would be <400ms so it's deemed to be OK for that time. But you are spot on and you illustrate exactly why supplementary bonding is essential in bathrooms - to remove the resistance between MET and the appliance CPC termination. The only way around that is to have RCD...
  16. J

    LOSING MONEY WHEN WALKING AWAY FROM BAD JOBS

    True but there are so many ways to think about it. Maybe 9 out of 10 customers who refuse bonding would accept once they are refused to have any electrical work done whatsoever by 3 different electricians. Whereas if all 10 had the rest of the work done then none of them would bother. I think...
  17. J

    Daisy Chain extension cordk

    Is that true? I used to think the same but i calculated once for a 20A type b with a socket right at the limit, followed by a 13A plug fuse and a length of cable, and from memory it came out as tens of metres.. whatever the result was i was surprised anyway. However i agree with your other...
  18. J

    LOSING MONEY WHEN WALKING AWAY FROM BAD JOBS

    The other issue about no bonding would be that the owner might feel that everything is ok now, and everything looks new, whereas with the old installation in place it keep the pressure on to have it done properly as everything still looks rough. You also never know if the person is just tarting...
  19. J

    Bonding Extraneous Conductive Parts

    That's one effect but the high level purpose is to create an equipotential zone which is basically preventing any potentially accessible conductive item introducing a different (from the installation earth) potential into the zone.
  20. J

    Asked to bond a sink (table)

    That's one way around the problem! If they are within the zone entirely it must have been the solid floor providing the path, although digging it up and installing mesh might have been even more impractical than bonding with 50mm flex

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