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extraneous

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  1. 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...
  2. 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...
  3. S

    Earth Bonding garage framework required?

    Should the framework for my garage door be bonded? It is just controlled manually, it's non-electric. The framework is just bolted to the blockwork? Pictures below.
  4. 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...
  5. Guitarist

    Interesting Extraneous conductive part.

    Asked to install a supply for a kiln and found this beauty...
  6. S

    When does Extraneous become Exposed? or vicaversa.

    OK...here's the scenario... Metallic incoming water & gas pipes, plastic clipped, no branches, to a correctly wired combi, but not connected. The pipes are Extraneous, the combi metalwork is Exposed. Connect the pipes to the combi... No involving metal window frames, knives and forks etc etc!
  7. 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...
  8. L

    Supplementary bonding required with RCD's?

    Much discussed issue this one. Appreciate any comments. I let a small one bed flat out. Electric only ie no gas. Year back I had a new CU put in with all circuits on RCD's (RCBO for lighting). Accompanied by an EICR. Registered ECA sparks did the work. The EICR documents that the mains...
  9. B

    Pir

    I have just changed some old 600 x 600 units over to spots with LED GU10's in some toilets and the spots flick on and off when they should be off. the switches are old PIR type with a battery in them. i have put a temp switch on one and it works fine but the client wants to keep old stuff. Help!
  10. D

    Main Earth Bonding in a Commercial

    Hi, need abit of help in regards to earth bonding. I'm working on a building with 10 studio flats and all the plumbing is done in plastic pips apart from the terminations of the shower and the water heater. the main incoming water supply is via a blue plastic pipe, which goes into a manifold...
  11. S

    TN-C-S / Pyro / Outbuilding Upgrade

    Hi, bit of a job with scope creep going on. "Oooo it's so good we've found a nice electrician we can get all these things done that we've wanted for years". Client wants new outside lights on garage but existing isolation and circuit protection supplying garage is falling apart so that needs...
  12. J

    Extraneous conductive part - big problems!!!!

    Hi Some flats have been wired and since the 1st fix electric has been done, gas has been installed into the flats. As this wasnt there as the wiring was carried out, there is no bonding to the incoming gas pipe in the flat. There is no access to bond without major disruption within the...
  13. L

    correct way to test for a extraneous conductive part

    Hi everyone Can someone please clear up exactly how to test if something is a extraneous conductive part, is it using a insulation resistance tester? I have a installation where the incoming water is in plastic then copper throughout the installation. If someone could clear this up it would be...
  14. J

    general testing questions

    On a PIR test to confirm Zs values i obviously go to thr BRB page 48.But when do i use the rule of thumb i.e 80% Method ?. I understand there are differences between a cold install to one that is in service as resistance changes when cables are warmer. On previous posts i have noted to qualify...
  15. B

    leakage on extraneous pipework.

    Hoping some one can help me as the NIC helpline admitted they couldnt! Carried out a consumer unit change and earth bonding upgrade. When bonding conductors connected to pipework there is an intermittent fault that trips the right hand rcd on the dual split load board, once the rcd has tripped...
  16. A

    bonding to shower in pre-fab offices

    Hello all, Recently tested some office accomadation units for a building site (the type that come as individual bays with own db and then get bolted together to form an open plan office and all db's for each bay run back to a main db for each floor). One area had four showers supplied from...
  17. S

    What is an extraneous conductive part?

    Yeah another noob question. But the red bible keeps talking about it and after doing a bit of googling im still none the wiser. So if possible please enlighten me, perhaps give an example and if you can tell me the difference between an exposed conductive part, thx :) P.S be prepared for more...
  18. B

    does heating radiator needs bonding?

    i have seen quite a lot of photos showing radiators having bondings, but most dont have, is it really needed? cheers
  19. W

    New MCB Board & the garage

    I am now in a postion to apply to join a relevant body for Part P approval. The CU in my house needs replacing (actually there are currently two as extensions have been added over the years) I will put in a new RCD split board but I am unsure about the feed to the garage which is away from the...
  20. tigerpaul

    Extraneous parts

    Supposing I have my Main Incomer (4c70mm2) at one side of a very large warehouse. My incoming water is on the far side. My Main Earthing bond (35mm2) is from the incomer to the M.E.T. I am going to equipotential bond my Structural steel close to the M.E.T. (25mm2) Can I then come off the...

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