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  1. I

    a puzzler can anyone explain it ?

    E24 anyone?
  2. I

    polarity of e14 and e27 lamp holders

    I though it said something along the lines of "Except for E27 and E14 to BS EN 60238....every edison screw lampholder should be checked for polarity" Accidental touching of the threaded base of the bulb (or for the pedants glass bulb, filament and connector and other miscellaneous bits that...
  3. I

    Neutral earth fault

    You will get an IR reading of 0.00 M ohms. That's not a dead short, otherwise it would have gone BANG by now...
  4. I

    One to confuse you all!!

    Having trawled my way through this post, it all becomes clear. The Fluke T120 continuity tester will still buzz for high resistances. It is not broken, it is operating within its intended design specification. The morale is use a proper tester - had the OP bothered to follow the procedure...
  5. fluke.JPG

    fluke.JPG

    • IzzyS
    • Media item
    • Comments: 0
    • Category: Electrical Videos
  6. I

    Neutral earth fault

    r1+r2 would have picked it up in this case, but without the r1+rn you could miss a line-cpc reversal. Which of course would be detected at the loop test stage, but that's not really the way. Especially with fancy metal sockets... so r1+rn is essential in my opinion.
  7. I

    certificates for builders and landlords

    Part P certification isn't just to confirm compliance with BS7671 - it also certifies compliance with all the relevant building regs. Even if your JIB man has 30 years experience of wiring airports, factories and nuclear power stations he may not have a clue about where to drill holes, or the...
  8. I

    Zs testing on TT

    Ben, I seem to come across more than my fair share of TT systems where the "rod" is actually the incoming water pipe. Just make sure you can actually inspect the connection - if you can't find it then it's not really BS7671 compliant, regardless of its value. Unless of course it is documented...
  9. I

    fire alarm help

    If you don't know what category the alarm is how can you claim to be competent to fill out the certs? I don't do fire alarms because I can't afford to spend 10 years in prison for manslaughter if I get it wrong....
  10. I

    burgular alarm install advice

    I find a bit of blutak to seal the cable entry (or Pirelli R391 sealing compound, if you have money to burn) usually keeps the spiders out.
  11. I

    burgular alarm install advice

    You could always fit a dual tech sensor - microwave + PIR detection combined. Ideal for unheated locations like garages or overly hot conservatories...
  12. I

    Electric Shock In The Shower

    Have I missed the part where you tested the IR?
  13. I

    multiple downlight connection question

    They must be enclosed according to the regs. Otherwise your really expensive house might burn to the ground and your insurance won't pay out...
  14. I

    Bs 1361

    The BGB (2011) changes included the fuse standard change from BS1361 to BS88-3, and the curves are slightly different. Max Zs values are still in the red OSG I think, or you'll have to look in an earlier edition of BS7671.
  15. I

    100mA delayed RCD tripping before the 30mA at DB. TT System

    Surely they can't be significantly different at the moment can they?
  16. I

    Lighting circuit issue......

    Other than it being something you've not seen before, and being confused by it, what regulations do you feel it contravenes? If none, then forget about it and move on. Life's too short.
  17. I

    100mA delayed RCD tripping before the 30mA at DB. TT System

    Have you done IR tests? Have you tried a ramp test of the time delayed RCD? Could be that there's some leakage current, but not enough to trip it until the grinder is plugged in. For example 80mA leakage + another 10mA from the grinder causing it to trip, but not taking out the 30mA ones...
  18. I

    What do you like most about electrical work?

    I like making unsolicited phone calls to telemarketing companies, web directories and 118.com, and asking them if the would like any electrical work doing....
  19. I

    Bathroom speaker set up?

    CPC. co. uk sell water resistant ceiling mount speakers. Part no. LS001133 for example. For safety keep the amplifier and all wiring outside the bathroom. Keene Electronics have an in-wall amplifier that fits into a 47mm deep 2 gang k/o box. i have no vested interest in either company...
  20. I

    Building regulations...or not...that is the question

    You can download all the relevant Approved Documents free from the government website. It's more than just Part P - your assessor will probably question things like where you drill the joists, height of switches etc.... The full list is as follows A Structural safety B Part1 Fire safety...

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