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operate

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  1. D

    Overcurrent in circuits

    Evening all...just a quick question. A customer was using a wallpaper stripper on a ring circuit, smoke started coming out of the back of the socket before the 32amp breaker tripped, what I don't understand is why the 13amp fuse in the plug didn't break? Could someone tell me why? Thanks
  2. M

    Intermediate switching

    I have recently wired a light with intermediate switching. when I turn on the light at one switch its fine, but when I operate the next switch it goes off! Then if I go and operate the next switch it comes on! But then if I go back to the first switch and operate that one the light goes off...
  3. S

    Security Lighting Controls

    Hi All, my friend asked me for some advice but im not 110% sure. He has installed a outside security light with built in PIR detection, but also wanted it to operate as a normal light when switched. So he has wired to switchlines from a 1g 2way switch, 1 switchline feeds directly to the live of...
  4. E

    Servant call box/bell

    Hello all This may be the second time I have posted this so apologies for any confusion. I am trying to wire an old Victorian servant call system. I have new push buttons, bell and transformer but the call box is original. I can get the bell to sound but the flags inside the call box I can...
  5. M

    What type of ADS is used for Short Circuit/Overload?

    I am at COLLEGE by the way, if your about to say join another trade or something lol. Also does RCD only operate if there is a earth leakage?
  6. W

    2391 - function testing ?

    Hi all, i have my 2391 practical exam coming up on thursday (22nd March) im currently running through all the tests, and making a publication showing a list of tests where i can just fill in the values for each test, ive come to the function tests section, as i see it i would add lamps back in...
  7. R

    One relay two horns?

    Hello everyone, I'm just wondering if I will be able to connect two horns both 15amps on one 30 amp relay but connected in parallel so I can operate the horns separately. So it'll be positive to the relay, then one switch to activate relay, with the two horns each with separate switches and...
  8. M

    RCCB won't operate.

    Testing a RCCB installation off a Crabtree Starbreaker. TT installation. All non powered tests good however 30mA RCCB failed all tests. Even tried at the Dist. board still no joy. Replaced RCCB and still the same. Earth earth loop impedance via earth electrode is 248 ohms which although a tad...
  9. J

    Yet another RCD question

    Does an RCD need an earth to operate? I know it's additional protection and works on a balance between line and neutral but does it need earth to operate? Thanks in advance Ben
  10. F

    RCD trip times anomilies

    Hey guys i have a question. A 63A 30ma RCD main switch protecting a 20 metre run of FP200 16A mcb in a 2 way ccu. Would you expect the RCD test results to be the same at source as you would at the end of line of the FP200? My NIC qualified electrical supervisor basically says that he takes...
  11. Amp David

    Testing old MCBs to check they operate correctly

    As far as i know, there is no way of checking an MCB for correct operation. Then today, i've been told you can do it by placing the breaker under load and using an EFLI tester to do it. How the hell would this work, sound like bull to me.:rolleyes:
  12. W

    Wiring a fan and a light so they operate at the same time?

    Hi, Im new here, so bare with me! I wonder if anyone can help? In my bathroom my extractor fan used to turn on at the same time when you pull the light cord. Today, i put a new light up and when i removed the base there was 6 wires coming from the ceiling, one set of 3 had black, blue and a...
  13. C

    Rcd test

    How do you do your rcd test
  14. J

    Best Fan Isolator pull switch

    Does any body have any experiance with a TP fan isolator pull switch that doesn't require a massive amount of effort to operate it. I've currently tried click, ashley and BG and cant get on with any of them because customers are complaining of the effort needed to operate them/cords breaking on...
  15. H

    Rcd Tripping

    Hi all, Does anyone know how an RCD can trip out.. when the board is dead. Main switch off, touch neutral to neutral bar and pop! Several times.. ??
  16. R

    how do i get a pto (permit to operate) ???

    Hi everyone , i live in Manchester and have seen various jobs for meter installers, but the job agencies tell me you need to have a pto (permit to operate.) How do i obtain this permit ???????????

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