insulation | Page 4

insulation

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  1. 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...
  2. L

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

    Am2 inspection and testing?
  3. 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...
  4. 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?
  5. 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...
  6. 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...
  7. 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...
  8. 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...
  9. 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...
  10. 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...
  11. D

    Coax Cable Insulation Damaged, Copper visible, Cable can't be easily replaced I think

    Hi, I'd really appreciate your help. This is in Europe. I have no electrical knowledge and very little construction/DIY knowledge. I know electricians / cable-provider-technicians can measure coax signal strength at the outlet with a specialized device. A cable is damaged right down by the...
  12. R

    Plug socket wiring - insulation concern

    Hi, I replaced a plug socket today for the first time. When putting the live/neutral/earth wires in the socket, I noticed that the wires are not fully insulated where they come out of the wall. There is a small exposed piece of wiring which looks like it previously had masking tape around it...
  13. B

    Solar PV insulation fault ABB aurora inverter.

    Hi guys, I am new to the forum so be nice! I used to install solar PV systems back when the tariffs were still good, and I've never had to go back to one of my old installs because of a fault, so I'm not too clued up with regards to fault finding on PV. A customer has recently called me out to...
  14. mak

    Insulation resistance test on a ring final circuit

    Might be trivial question. My understanding is that we test on either leg of the ring since both legs make up a radial, but some say they test both legs at once, i.e. LL to NN, it would make sense if the other leg is not insulated since this is a live test, but I don't see why not if the other...
  15. B

    Derating cables laid on top of loft insulation

    Hi All, opinions please, just been to a property that has a 6mm cable ontop of 200mm of loft insulation so not buried. What de-rating factor would everyone apply to this Would it help if i could get it in some big trunking?
  16. Q

    Reference methods for cavity walls without thermal insulation

    Evening all Just wondering what would be the reference method given for a twin and earth cable in a cavity wall without insulation....I understand with insulation its either 102 or 103 but these massively de rate a cable and so was thinking is it b without the insulation as it acts similar to...
  17. M

    Wall insulation

    Just first fixed a house where I was initially told that the external walls were going to be battened then boarded, I used metal capping over the 2.5mm T&E ring final circuits on the external walls and chased the internal ones into the wall with 20mm oval conduit. I have now been told that the...
  18. wsoppitt

    Insulation resistance issue.

    This is a new 1 on me. Testing a ring final circuit within a timber outbuilding. All clear on insulation resistance with socket fronts connected but not screwed into metal back box lug. As soon as I connect any of the plates to the back box I'm getting around 16megohm between n and cpc. When...
  19. C

    Opinion On Cable Ampacity in Thermal Insulation

    Ok, so a while back I came across a rather interesting article referencing an incident where MC cable had been buried in thermal insulation resulting in a small fire. The magazine claims that if the cable was de-rated to BS7671 standards over heating would not have occurred. However, I am...
  20. UKMeterman

    50V insulation checker hire

    Hi, Any suggestions where to hire a 50V megger, I have a telephone installation where the BT fault checker is reporting low resistance and a standard multimeter can't do the job. Thanks

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