conductive | Page 2

conductive

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  1. westward10

    It's the weekend so....

    Do you bond cable trays?
  2. H

    Steel Conduit

    Hi Just got a quick question. I install CCTV systems and want to start using steel conduit instead of PVC. Do I need to ground the conduit if it will only have CAT6 network cable inside. Thanks
  3. Michaelwgroves

    Extraneous Conductive-part

    I've had my work assessed which has raised a question about Extraneous-conductive-part. I just want to be sure I fully understand this. BS7671 Part 2 defines it as; A conductive part liable to introduce a potential, generally Earthed potential, and not forming part of the electrical...
  4. Sintra

    Key Fact Sheet Extraneous Conductive Parts Explanation

    Sintra submitted a new resource: Extraneous Conductive Parts - Extraneous Conductive Parts Read more about this resource...
  5. Midwest

    Extraneous Conductive Parts in Bathroom

    Currently doing a kitchen refurbishment. When doing the quote, peering under the kitchen sink, noticed bonding to water was 4mm, and same for gas. Property has a TNC-S supply, and had replacement CU in 2010 (no certs available). Said to customer bonding should be upgraded to 10mm. Easy cable...
  6. T

    Fault protection in conductive location with restricted movement

    Hi all, any ideas on how to implement fault protection in conductive location with restricted movement for hand held power tools(110v site tools)? As per sec 706 of BS7671, electrical separation is required but also reg n 413.3.3 & 413.3.6 states then on separated side NO connection to Earth...
  7. 1Justin

    Old very conductive potting compound. What was this stuff?

    I'm digging out a set of a dozen ground mounted floodlamps installed in ~ 1985. The junctions to SWA are all made within galvanized conduit boxes, which are suspended in air inside large bucket-sized underground clay pots. Most interestingly, the source of extremely low insulation resistance...
  8. E

    Testing gas pipework for extraneous conductive parts

    Just checking before I blow a hole in the wall that using an IR test at 500v is ok on bottled gas pipework. Seems like the sort of thing that in hindsight you'd wonder why you thought it was a good idea. Could disconnect the bottles, but that would seem to make the test pointless.
  9. J

    Testing supplementary bonding

    I wondered what you're thoughts were on this method of testing the supplementary bonding in a domestic installation. So disconnect the ten mill water bond at the board and connect one crock clip to it then connect the other crock clip to the cpc bar, Hey presto can anyone think of a reason why...
  10. yellowvanman

    extraneous conductive parts

    Recieved my copy of NICEIC/Elecsa 'Connections' magazine and notice they are using a different calculation in determining if a metal part is extraneous or not. Many on here have been using the 22Kohm figure, when using an insulation test between MET and metal part. Now Certsure are using the...
  11. W

    Extraneous Conductive Parts

    In a house conversion there is a huge steel goalpost beam(2,000 kgs worth) than spans 3 rooms, and supports the floor in 4 others. Theidea is that it will be completely covered at the end of it all but there is cable tray clipped to it and cables running along it. (The web provides the only...
  12. W

    Conductive grease?

    Been looking for some conductive grease for Galv conduit or maybe even swa glands. Anyone do this, thought may help with Zs among other things. Considered using copper slip? Cheers
  13. S

    Extraneous conductive parts in outbuildings

    Hi, i am after a bit of advice. I went to a property which had 3 outbuilding, all were separate from the main building, one garage, one shed, & a workshop. Circuits all supplied from main building. Earthing system is TT. In all of the 3 outbuilding there is a separate water supply with...
  14. U

    Main Earth from Extraneous Conductive Part

    I was at an old maisonette the other day, and everything was old wiring, 3036's etc. Then I noticed at the CU there was no apparent main earth coming from incoming supply, and it looked as though there once had been an earth clamp around the DNO supply cable, tried Zs from cooker s/o and...
  15. Guitarist

    Interesting Extraneous conductive part.

    Asked to install a supply for a kiln and found this beauty...
  16. B

    Conductive floors question..

    How do they work and what is the difference between them and anti static floors??
  17. P

    conductive brick wall????

    Hello all, I'm new to this forum. Has anybody ever come across a conductive type of house brick? I know it sounds crazy. A heating engineer I was working with got a buzz off the bracket of his boiler he just screwed to a wall. The whole wall was setting the volt pen off. I penetrated the...
  18. E

    Quick Definition Help needed (No ref books with me right now)

    Would anyone be so kind as to reply to this post with the BS7671 wording of the definitions “Exposed Conductive Part” and "Extraneous Conductive Part". At work right now (without ref books) and trying to remember if the definition of “Exposed Conductive Part” is restricted to part of an...
  19. M

    Heat Conductive Rubber??

    Can someone please help me in finding what material is used under a heat press used for soldering ribbon to a solar cell? I can see a thin strip of what I assume is a “soft” thin strip of silicon or rubber to make a connection between the heat source and the tabbing ribbon. I’ve seen something...
  20. I

    Metal C.U (exsposed conductive part)

    hi all quick question , have an outbuilding which has no extrenuous conductive parts (water,gas,steel frame construction) the supply is TN-C-S and the earth has been extended to the outbuilding. The existing C.U. is plastic but has become damaged, are there any problems re earthing/bonding if...

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