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depth

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  1. J

    Fault current, and earth electrode resistance: Numbers not making sense

    In "Advanced Electrical Installation Work" by Trevor Linsley, he says that an earth electrode rod that is 1m deep will typically have a resistance of between 10 and 200 ohms. Given that fault currents can supposedly, momentarily, be in the order of 1000's of amps, this makes me scratch my head...
  2. M

    SWA burial depth under patio flags

    Hi everyone, I am digging the trench for 25-30m of 3x6mm SWA from my house's CU to the (yet to be installed) summer house. 95% of the length will be under a new stone patio. This is part of a major back garden landscaping project which I challenged myself to do on my own (most of it anyways)...
  3. M

    move power sockets into stuff wall

    Stud wall being built to contain insulation, directly adjacent to and in front of to existing external wall in a terraced house bedroom. The idea is to improve insulation in the room. House has been rewired about two years ago. There are two double power sockets in existing wall, metal back...
  4. N

    general building regulation

    Sorry guys just looking for a little help here, I done a homer for a joiner and I cut a notch out a load baring exterior wall and fitted a metal back box, the client is complaining and is trying to charge me, but I know that I'm aloud to notch up to 25% of the width of the stud and basically I'm...
  5. B

    out of my depth

    Hi Basically I'm after a time clock that will operate 3 different lighting circuits. Or am I ****ing in a tornado
  6. L

    Correct depth for SWA

    What is the correct depth for installing SWA cable ?
  7. P

    Solar PV Calculators / Tools

    Hello all, I am a web developer that works exclusively for a PV Installer in the midlands. They have commissioned us to create an in depth PV Calculator. I will post on here when it is complete for you guys to test. Whilst creating this it got me thinking of the days when I used to design...
  8. Guffer

    Plaster Depth Boxes with Screw Protection

    Hi anybody know if its possible to get metal plaster depth boxes where the 3.5mm accessory screw is encased, as they are in surface boxes and plasterfix boxes so as to prevent tilers screwing back through cables. Never given it much thought before but it makes sense.
  9. H

    SWA Depth

    New to this forum but can anybody give me the exact depth that SWA Cable should be buried at only figure i can find in 7671 is 600mm but it also says its up to situation.So is it all down to interpretation.
  10. K

    Mains Cable

    Working on a property at the moment and mains cable coming in from the road has been exposed. The builder has taken up the flags from the front garden and right underneath them was the mains cable. The front area of the property is going to be tarmacked in a few weeks so they will be digging...
  11. O

    LAP switch back box depth

    Anyone have any idea what the required backbox depth for a 2G 2Way LAP white light switch is? LAP 1-Gang 2-Way 10AX Light Switch White | Screwfix.com Screwfix website doesn't say, should be ok with the existing 16mm the client has, but just want to check before buying the switch, if needed then...
  12. H

    Third Party installation connection

    Just on a job. Guy wants couple of sockets and lights in garage. There is already a SWA installed from hour to garage but not connected either side. Customer assures me qualified electrician buried it when the house was rewired a couple of years ago. Just done IR tests and all serms to be...
  13. kevyn

    depth of chase and rcd protection.....

    If the cables are chased more than 50mm into wall what is the requirements for rcd protection? Have missplaced the big red so can't check just now. It is not possible for me to rcd protect new cables in extension without ripping up rest of the house. It is feed from an old 3036 rewireable board.
  14. R

    Shallow depth ground lights

    Hopefully someone can suggest some that they've used, i am putting some decking down near my shed and I want to put some lights in the decking but I don't want the little piddley type ones , I want the bigger ones( like gu10 sized ones) but here's the problem I only have about 75mm to play with...
  15. K

    cutting tongue and groove chipboard flooring?

    Hello folks, I was wondering if i could get some tips from you all for cutting up tongue and groove chipboard flooring,Because today when the joiner took up a section off the floor there was pipes very very close to the tops of the joists and right underneath the flooring.. Whats the best way...
  16. T

    Regs on UG cable depth and marking

    Hi, Some uplighters have been installed at a local church and it seems to me that the UG cables may not have been buried deep enough and also that they have not had a warning tape buried in the ground above them to warn folks not to dig there. Can anyone confirm what I have found in the...
  17. T

    Looking for qualification(s) for industrail and gaining more in depth knowledge

    Whats the best course to do after 2391-10? Is is the part 2 or would a HNC be better or 2330? any advice would be much appreciated. - Could anyone give me a brief description of what the content is please
  18. S

    Depth of cables ?

    I qualified under 17th edition and having trouble getting any documentation on the 16th edition, i would appreciate any advice you can give. Currently decorating my kitchen in a rented bungalow. The CU is located in a base unit and the cover can only be opened if i take a drawer out and then...
  19. G

    Mounting kit for yingli panels

    HI all i can source some yingli 240w panels and they have to go landscape, any one know the best mounting system to use , i think they are 50mm depth?. Cheers Grand
  20. O

    Bosch GMS 120- or similar

    All I need to invest in a cable/pipe/joist detector - thinking about the Bosch GMS120 - do any of you have any thoughts on this bit of kit? I don't mind paying a bit more for a good one! Thanks

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