insulation

  1. N

    UK RCD Trip - insulation problem from too much load?

    Hi guys, first time poster, be easy! I'm caring for a friend and last night while sleeping on the sofa-bed an emergency system that had lost power was sending out a warning signal. Startling to say the least. The RCD had tripped and after some internet sleuthing I managed to isolate the...
  2. S

    Test for insulation damage

    Hi, A rat has chewed through some insulation on a circuit in my house. The cable will obviously need replaced but I can't identify we're along the circuit the insulation has been damaged. Is there anyway to test for this?
  3. K

    Low Insulation resistance test on smoke detectors

    Hi Everyone Just a question bothering me as you cannot do Insulation resistance test on smoke detectors as they can become damaged so obviously smoke detectors are sensitive but they are also installed on lighting circuit so if perform low insulation resistance test 250V between Live and...
  4. D

    Insulation Resistance - Low Reading on Ring

    Newbie Testing Question: I am getting a very low IR reading between L&N on a kitchen ring (0.01M). The ring was working fine with no tripping before testing. Can anyone shed any light on what may be causing this low reading? Thanks
  5. P

    The cost of poor insulation

    I've just tested a sub-main cable running to an old barn. 0.05 Mohms at 250V. Obviously a fail, but the customer says it's fine because it works. As they're clearly not interested in their own safety I wondered if I could make them see sense by the cost. So my question is; How much does it...
  6. P

    Insulation readings

    Hi, I’m confused. I recently carried out insulation resistance test on a 3 phase board I had some weird readings. I removed all vulnerable bits of kit and tested the dead side of the incomer all readings where good a part from L2 which had a low reading of 2.8M ohms. This was much lower than...
  7. J

    Insulation resistance on new installation

    I have recently completed a rewire as part of a complete back to brick renovation in a pretty standard domestic property. Upon carrying out initial verification I uncovered a few strange IR readings. Multiple circuits with low(ish) readings of around 150-200Mohm. However they all tended to rise...
  8. A

    Line & Neutral insulation tape

    Hi people. On my AM2 they supplied black insulation tape with the letters L or N on for tails identification. Does anyone know where I can purchase these please? I also remember they had L1 L2 L3 tapes. Thanks
  9. D

    Is it ok to do insulation resistance test on RCBO at 500v?

    I know you are not supposed to do a insulation test on circuits that are protected by an RCD at 500v because it may damage the electronic components inside the RCD so that's why you switch the RCD off before you test the individual circuits, however, what if the circuits are all protected by...
  10. Z

    UK Equipment excluded for insulation test

    I don’t think there is a comprehensive list of equipment that should be considered to be “neutralised” before doing insulation testing. as a small starter: dimmer switches Pilot lights Equipment with capacitor RCD USB sockets Light bulbs Sensitive equipment ? really appreciate if the list...
  11. Q

    Insulation resistance query old style hager rcbos

    When carrying out insulation resistance testing on old style rcbos (hager) I understand you are supposed to disconnect both line and neutral aswell as both the neutral and functional earth fly leads.....however does this in theory mean you need to disconnect the above for all rcbos at the same...
  12. L

    Am2 inspection and testing I need advice in insulation testing if anyone knows how it's done correctly please?

    Am2 inspection and testing?
  13. Pretty Mouth

    Plaster board faced insulation - making good?

    Hi all. I'm after some practical advice please. Got a job to quote for, fitting a couple of gimbal downlights in a sloping ceiling in an attic room. The construction appears to be PIR (celotex or similar) insulation between rafters, with plasterboard faced PIR insulation over the rafters...
  14. J

    Insulation tape on connector blocks

    Is it necessary to cover the connector block in insulation tape when live connections have been made into a connector block?
  15. G

    "Budget" DIY'er insulation tester recommendations

    I have an SWA cable running from the CU to the garden that the previous owners had fitted, but no longer worked when I moved in a few years ago, that I want to reinstate. The cable itself runs from the kitchen where the CU is and is then buried under the floor, under the utility room and shower...
  16. J

    UK Insulating copper tube splices

    Hi, what are people using to re insulate a copper through crimp In a metal adaptable box please? Also my SWA CT650H crimp tools don't want to crimp splices - E.g On the 10mm setting a good tug and the splice falls off, setting to 6mm will crimp nice and snug. But thats not great. Any guidance...
  17. S

    Low insulation resistance and tripping circuit breaker

    I've just done an insulation resistance test between line and earth and got 0.0 Mohms for most circuits. Obviously this is an F1, but what I don't understand is why the CB doesn't trip. Is the answer that the resolution on my tester isn't high enough? So I could for example have 0.049Mohms and...
  18. J

    Insulation resistance on modern installations

    On initial verification of new installations I have been having a hard time with insulation resistance. With RCBOs, fixed LED luminaires, intelligent dimmer controls and other sensitive equipment now the norm on almost all installations how do we overcome this and still carry out effective and...
  19. Q

    Reference methods for cables ran under floorboards and into stud walls no thermal insulation

    evening all I am wondering what the installation methods should be for cables run under floor boards and then into stud walls but without thermal insulation...102,103 dont seem relevant and so my understanding leads me to think it would be a cross between c for clipped direct under the boards...
  20. D

    UK Low Insulation Resistance Test

    Hi guys, Hoping someone can clarify some things here. I had a socket replaced in my kitchen recently and as part of this, the electricians did an Insulation Resistance test and told me the reading was very low at just over 1 mega ohms. They advised me to basically rewire the ring (at...

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