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  1. GBDamo

    2.5mm or 4mm SWA armour bonding

    Armour not CPC. By the letter of the regs 2.5mm is acceptable as the DB offers both mehanical and corrosion protection. Just seems a bit puny on a 10mm SWA, what about a much larger cable? Can some of the boffins explain why 2.5mm is deemed acceptable. Cheers
  2. A

    Earthing and bonding new build

    Hi guys bit of advice needed to save me some time and money. Earthing and bonding required in new build property. 10mm earth to be ran to gas meter to clip to gas pipe that will enter property. This gas pipe then goes to a combi boiler where I will bond all pipes at combi to the gas pipe (gas...
  3. MarkRibbands

    Bonding metallic back boxes. Best practice?

    Something about the way this box is bonded feels wrong. I prefer the box to remain bonded even with the accessory removed. Is this method compliant? What do others think? (Ignore missing grommet) (Taylor Wimpey new build)
  4. L

    Gas Bonding Conductor in 20mm conduit

    The scenario, Property has no bonding to gas meter. There is a 4mm T+E radial from the DB to an outside socket which is located 300mm from the gas meter (external meter). The 4mm T+E is housed in 20mm plastic conduit running along the external wall. To prevent things looking a complete mess...
  5. driverman

    Domestic Additional supplementary bonding

    Ok new house. New install cert issued. However, no supplementary bonding that I can see and accessible . There is a 10mm earth wire connected above the water stop cock point of entry under the kitchen sink. However, no cross bonding to the hot pipe. According to install cert the cross bonding...
  6. B

    Bonding Cast Iron Pipe

    Hello. The toilet is connected into a cast iron waste/soil pipe O.D. 150mm. Apparently, this is an extraneous conductive part and is thus supposed to have a main protective bonding conductor connected back to the MET. There is a bonding clamp for 150mm O.D. pipes available. However, the pipe...
  7. Maxine

    Domestic Earth bonding for meters

    Hi, I am just after some advice. I am having new meters fitted and been told they need to be earth bonded? I've attached a photo as my friend thinks this has been done but I need to know before I book an electrician, so any help is appreciated, thank you
  8. N

    supplementary bonding

    we are allowed to omit supplementary bonding on the 3 conditions (rcd, disconnection times and main bonding adequate ) if we have a plastic insert we may omit main bonding on water for example. would supplementary bonding have to be added as it no longer has main bonding ?
  9. Soulcraft Electric

    BISF (British Iron and Steel Federation) prefab houses and main bonding

    Carried out a couple of EICRs on BISF prefabs and on both there is no main bonding to the steel frame of the building. My scheme technical helpline advised that main bonding was not required. Just wondered what people's thoughts are here? These are NOT pictures of the actual lofts (the roof...
  10. S

    Industrial gas supply bonding.

    I've got to earth a new 50mm steel gas pipe. The pipe fitter didn't fit an earth stud to it and now he's gone. Am I just looking at a large earth strap or something else? Any ideas are welcome?
  11. C

    Parallel generator, earthing and bonding

    Hello, can anyone advise on bonding of extraneous conductive parts when supply is from a generator run parallel with distribution network? There'll b a 200kva generator supplying spray booths that have a gas supply to them. The metal pipes aren't underground but connect to tanks outside sitting...
  12. M

    Domestic Gas Bonding to MET or consumer unit

    sorry if this has been covered but I cannot find answers - 1st floor flat TNS supply from basement - the water is bonded at the stop cock within the flat to the consumer unit . The Gas enters in 2 places for cooker and boiler . Some "brightspark" has earthed this via a rod at the meter - does...
  13. D

    Domestic Gas meter earth bonding

    When running the 10mm Main Protective bonding to the Gas in a semi recessed gas meter box, how do you enter the box with the cable? The reason I am asking is: 1) The pipe sleeve for the gas pipe can not contain the earth as it is not 25mm separation. (yes I know it will attach to the pipe...
  14. Marcus Vaughan

    BS951 Bonding Clamp on the Incoming Supply

    Hi all, Just been to look at a job for a consumer unit changeout, checked the supply and, Not sure you can see it too well but TNS system with older earthing conductor in green kind of sweated onto intake (connection does not feel too good), but disconnected at the other end (goes into that...
  15. Gladius

    Faraday cage earthing.

    Hi there, We will need to earth a Faraday cage room in an experimental work, do we need to certify the job? Can it be only earthed into the plumbing pipes if available (Bonding?)? If there are no pipes around should we earth it into a mains circuit using a junction box or surface box for...
  16. edexlab

    Bonding Control panel

    Currently building a system for a PITA customer Did stage 1 last year ( I only did onsite install) They snagged and changed totally nonsensical things at a whim and my company let them Resulted in job being completed 4 mths late This year stage 2 only had 4 electrical snags versus 176 last...
  17. happyhippydad

    Understanding the new regulation regarding Main Bonding.

    Regulation 411.3.1.2 states .... Main bonding conductors shall connect to the main earthing terminal extraneous conductive parts. It then goes on to say... 'Metallic pipes entering the building having an insulating section at their point of entry need not be connected to the protective...
  18. AlmondSauce

    Bonding outside copper pipe

    We have a copper pipe running along a wall outside in the garden - it's used to supply a sprinkler system. (Inside the house it's plastic, there's a join to copper just before it comes outside.) Should it be bonded? It's not at present. All my knowledge of bonding comes from pipework running...
  19. S

    Main Protective Bonding Conductor question

    Hi guys Would appreciate your comments on the following.. I am currently involved in the refurbishment of a building with 2 service heads (both in use) but only one gas intake and one water intake. What are the main bonding requirements in this situation? I am assuming both MET's require a...
  20. J

    Street furniture bonding

    What are peoples thoughts on bonding powered Street furniture that is within touching distance of each other. I have a few ideas but there is nothing in the regs for guidance. Thanks
  21. J

    Domestic IEE 18th, 701.415.2 p241 - sup bonding bathroom

    Hi Old time 15th Ed. working way through 18th in prep for 18th test, also been a while since i wired in anger so to speak :-). 701.415.2 states that i can omit supplementary bonding in my bathroom so long as i have a protective equipotential bond compliant to 411.3.1.2 and finals in the...
  22. C

    Main Earth Bonding (two supplies)

    Large house with x2 power supplies/ service heads. first supply 3 phase TN-S located in a pig of a place and is furthest away from the gas and water entry points and meter positions. Second supply is a single phase TN-S located only a few meters away from the water and gas entry points to the...
  23. edexlab

    Bonding tray in 18th edition

    I've not yet got a copy or read the 18th ed But I heard the other day from a young Engineer at work who's doing the course ( his first time doing regs exam) that in the 18th it's compulsory to bond all joins in tray etc Can anyone elaborate on this?
  24. Y

    Bonding earth to metal furring behind plasterboard.

    Should I bond all metal furring behind plasterboard to earth busbar
  25. happyhippydad

    Does this require Main Bonding?

    The water pipes enter the house in metal, then there are a few cm's of copper after the stop cock and then plastic. It is hidden behind the kitchen draws (which can be removed to access). Does this require Main Bonding? The stop cock tests as 0.36Ω to earth, it is TNCS. I just cant see how...
  26. Thomas Connolly

    RCD Testing and Bonding question.

    Good Evening Everyone, I've gotten myself some work along an experienced electrician which I am massively grateful for. Prior to this, I need to test an installation. I am confident on the use of my tester and how to carry out the tests from what I have learned when I got my C&G2392 but I...
  27. J

    Domestic Bonding Extraneous Conductive Parts

    hi. Question re bonding a metal where cold comes in as metal pipe ground into house. So cold will be bonded where service comes in. Read article in wiring matters 2019 about changes for part 18. Example given of faulty kettle where fault to earth exists at kettle, some one touches kettle...
  28. mattg4321

    18th Edition Bonding requirements

    Was talking about this with a couple of guys on site earlier and differing opinions were had. It seems the line quoted below has introduced some confusion. "Metallic pipes entering the building having an insulating section at their point of entry need not be connected to the protective...
  29. BeardyJaws

    EP Bonding Copper pvc copper

    Hi, a little clarity required please. I’ve recently been to a property to make an emergency repair to a broken cable ( they drilled through it). I’ve patched the cable for the moment but while I was looking at the bonding I found the CH pipes bonded next to the incomer but not the incomer...
  30. J

    Bonding - CU or Main Incoming Fuse

    I'm aware that a 10mm earth cable needs to run to the incoming water and gas supply but I was wondering if someone could tell me whether this should be from the consumer unit, the main incoming fuse, or both? TIA
  31. C

    Sup bonding code for property with no rcd

    What code would you give when doing EICR for a property that has no supplementary bonding in a bathroom, there is no RCD on any circuit but zs and insulation tests are good, Is it acceptable to measure the resistance between the shower and pipework, if it's under 0.05 ohm's take it as bonded...
  32. P

    Communication cable bonding requirements

    Hello new here so please be kind. Im not qualified but have had work checked and signed off by qualified electricians. I have installed communications and video cabling throughout house using shielded cables and these require bonding from cabinet to earth to drain static etc. Can this earth...
  33. PJH2903

    Undersized Water bonding advice please.

    Been out to price for another CU change this evening and would appreciate the groups advice. When looking at the job I noticed that the water bonding is undersized at 4mm on 25mm tails so should be 10mm which is not a problem as I can include that in the quote. Gas bonding has been done and is...
  34. multimick

    bonding thoughts with a sure stop remote tap fitted

    hi all terrace house lead water incomer with old stop cock which i assume is redundant as plumber has fitted a surestop stop tap the one which works by air pressure switch,,i put the main bond on incomer before sure stop (only about 2 foot of pipe) he swopped it to after the sure stop...
  35. R

    Pricing Kitchen rewire and consumer unit upgrade with bonding and Cert

    Good evening people. I'm about to price up a kitchen we wire for a friend I've done work for mates before and know how it goes. Anyway, was hoping to get some guidance as I'm an improved and steadily taking on larger jobs myself. Job: Kitchen rewire. 3 sockets 3 single sockets chased in 4...
  36. Gavin John Hyde

    twin and earth for water bonding?

    Been on a quote this morning to provide a new circuit for oven and hob in a kitchen, Customer says Cu changed about 2 years ago, they have been in house just a few months. Gas, CU and cutout all in recessed cupboards in kitchen; face value looks okay. then I see the wiring is poorly dressed and...
  37. Doomed

    Gas bonding in block of flats

    Old block of four flats now having gas installed for the first time, all gas meters together just outside front door, main earthing terminal (and earth rosd) just inside front door. Gas pipes run to boiler in kitchen of each flat, less then 1 meter of pipework inside the flat, rest on the...
  38. happyhippydad

    Main bonding and the new regulations.

    Evening all.. I am so used to the fact that there has to be Main bonding that I am struggling to not put it in in the following case: Incoming pipe is plastic. The builder has then fitted a plastic stopcock (inside the house) and then a mixture of plastic and copper from there (see pic). I...
  39. C

    protective bonding conductor size

    Hi guys, I've questioned something at my workplace and after receiving my answer I'm not overly convinced and would like some other experienced gods to chime in :) On a new install in an existing property today I went to bond the Water and noticed it was already done, clearly many moons ago...
  40. Daniel Oake

    What are your opinions on bonding water pipes if main incoming is plastic?

    You turn up to a property that had recently had an EICR, reporting that the water had no bonding. The main water stop cock and on-wards was plastic push fits with maybe 400mm lengths here and there (downstairs), but upstairs is still all copper piping behind bath panel and sink pedestals to 2...
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