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Discuss Should I use 1mm or 1.5mm earth in domestic lighthing? in the Electrical Wiring, Theories and Regulations area at ElectrciansForums.co.uk.

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  1. midiman
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    midiman Active EF Member

    Hi,

    I need to earth a replacement faceplate to a steel back box in the wall.

    Should I use a 1mm, or 1.5mm sleeved cable for the job?

    Thanks
     
  2. KEV 1 N
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    KEV 1 N Regular EF Member

    Location:
    Durham
    Either will be fine as long as it's green/yellow wiring or sleeved that colour.
     
  3. midiman
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    midiman Active EF Member

    I will go out and buy a metre of 2.5mm t&c and sleeve it yellow and green.

    I just want to be safe.

    Thanks
     
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  4. westward10
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    westward10 In echoed steps I walk across an empty dream. Electrician's Arms

    Location:
    Northamptonshire
    Wait for it.......
     
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  5. KEV 1 N
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    KEV 1 N Regular EF Member

    Location:
    Durham
    The earth in the 2.5 is actually 1.5, but 1.5 will be better than 1mm. If you use 2.5mm that may be too big to fit in the switch earth terminal
     
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  6. midiman
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    midiman Active EF Member

    Hi,

    Sorry I didn't explain it well.

    I meant I will go out and purchase a metre of 2.5mm T&C so that I get the 1.5mm earth.

    Thanks.
     
  7. Vortigern
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    Vortigern Electrician's Arms

    Location:
    England
    Business Name:
    F.H. Electrical
    Seems you might be safer leaving it alone.
     
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  8. saint
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    saint Regular EF Member

    Location:
    West Sussex
    If your spleen ruptures and needs removing would you pick up a knife or a spoon from your local shop to remove it?
     
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  9. Vortigern
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    Vortigern Electrician's Arms

    Location:
    England
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    F.H. Electrical
    Wow I got a dumb from a dumber.
     
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  10. telectrix
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    telectrix Scouser and Proud of It Trusted Advisor

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    just use this and put green stripes on it.

    showing-ass.gif
     
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  11. westward10
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    westward10 In echoed steps I walk across an empty dream. Electrician's Arms

    Location:
    Northamptonshire
    What sort of accessory is it.
     
  12. telectrix
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    telectrix Scouser and Proud of It Trusted Advisor

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    a metal one. :mad:
     
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  13. einstein
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    einstein EF Member

    Location:
    Pavlovs House
    please strip the cable correctly using an electricians knife, dont just pull the earth to split the grey sheathing
     
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  14. PEG
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    PEG Trusted Advisor

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    Manchester
     
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  15. stevethesparks
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    stevethesparks Electrician's Arms

    Location:
    Northampton
    I thought it was a copper rip cord - what else could it be used for :)
     
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  16. Pete999
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    Pete999 Trusted Advisor

    Location:
    Northampton
    What size are the lighting circuit conductors L,N and cpc? written yesterday and forgot to post
     
  17. Cadgey123
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    Cadgey123 Electrician's Arms

    Location:
    London

    Please don’t tell me we are still reverting to the “ your going to stress the copper conductor, therefor decreases CSA, therefore an immediate fire risk.” o_O
    I strip it like that, not one of my jobs has ever went wrong
     
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  18. Vortigern
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    Vortigern Electrician's Arms

    Location:
    England
    Business Name:
    F.H. Electrical
    These little touches are the difference between an electrician and craftsman.
     
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  19. Cadgey123
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    Cadgey123 Electrician's Arms

    Location:
    London
    I am going to disagree.
    I still cut a neat edge with my knife at the end of the cable.

    If you connect 10 sockets on a RFC and connected them both ways. I bet the resistance of the cpc ring is the same. A lot of rubbish. My college didn’t even bother telling us otherwise.
     
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  20. Risteard
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    Risteard Electrician's Arms

    Location:
    Derry, Ireland
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    Walsh Electrical Services
    To be really controversial the training centre here taught to strip it by pulling the cpc! I really don't see the problem with it. :p
     
  21. Cadgey123
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    Cadgey123 Electrician's Arms

    Location:
    London
    I don’t see a problem with doing it with a knife. I just think it’s a faff and more risk of catching the cables. Trying to get your knife in a small accessory box is a pain.
     
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  22. HandySparks
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    HandySparks Trusted Advisor

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  23. Pete999
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    Pete999 Trusted Advisor

    Location:
    Northampton
    Never s
    Don't think you would go wrong with a knife like this
    https://www.amazon.co.uk/goods4less...7896736&sr=8-3&keywords=ck+electricians+knife
     
  24. Strima
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    Strima Electrician's Arms

    Location:
    St Neots
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  25. Vortigern
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    Vortigern Electrician's Arms

    Location:
    England
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    F.H. Electrical
    When I look at a job and see split ends on cables and screws not straight in the fixings I think straight away "Ok not a top job here I wonder what other corners have been cut". I showed this to a third year trainee and like you @Cadgey123@Cadgey123 he said it's a load of rubbish, not quite the same words but similar. I challenged him to strip ends of cables faster than me. He hadn't even got hold of the earth and I had stripped my cable ends. I know its a bit purist but that is my whole approach to be exact as I can. I just like to make everything neat and be very careful. I know I probably would get thrown off site if found to be doing such careful work but hey I am my own man I can proced pretty well how I like. Conversely if you inspect work that has been done the way I would suggest, you think Aha one of those guys, very fussy and careful ok...
     
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  26. westward10
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    westward10 In echoed steps I walk across an empty dream. Electrician's Arms

    Location:
    Northamptonshire
    Nothing else happening, obviously.
     
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  27. Midwest
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    Midwest Electrician's Arms

    Location:
    Oxfordshire
    upload_2017-10-13_18-40-7.jpeg

    Okay, need to change the habit of a life time.
     
  28. Pete999
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    Pete999 Trusted Advisor

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    Might change your mind if you were taught correctly in the first place Middy.
     
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  29. telectrix
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    telectrix Scouser and Proud of It Trusted Advisor

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    hmmm.i might have banged my fist on the wall when cpc has snapped when using it as a ripping cord, but never had a sliced finger or a cut through the conductor's insulation.
     
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  30. ipf
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    ipf Trusted Advisor

    Practice and craftsmanship, maybe?
     
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  31. telectrix
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    telectrix Scouser and Proud of It Trusted Advisor

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    what we need is as was developed by star trek .dr.mccoy .laser probe cuts through skin but not tissue ( insulation) and conductor ( bones )
     
  32. PEG
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    PEG Trusted Advisor

    Location:
    Manchester
    Vortigen is correct,and then you just have to step back,and let each to their own.

    I have,and would never,run a knife around the sheath of a SWA,because the tiny cut to the plated steel armouring,is where the corrosion starts...simple as that.

    I would not unduly apply scorn,to a man using a knife to do the same task,it's just that he's wrong...and i'm not ;)
     
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  33. Vortigern
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    Vortigern Electrician's Arms

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    England
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    F.H. Electrical
    Just as a matter of interest @PEG@PEG how do you strip the outer sheath of SWA without the aid of a sharp implement?
     
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  34. Midwest
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    Midwest Electrician's Arms

    Location:
    Oxfordshire
    I think I was taught rightly or wrongly, of both ways. Never seemed an issue to me not to use a knife.
     
  35. NDG Elecs
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    NDG Elecs Electrician's Arms

    Location:
    Tyne and Wear
    I can categorically state that using the CPC as a rip cord does decrease the CSA. Recently I had a small ring with L-L and N-N each measuring 0.10 ohms. Due to my poor de-sheathing technique the CPC when tested was 0.169 ohms. The 0.002 ohm shortfall posed a very real fire risk in my view so I immediately pulled the walls apart and rewired it all. It's a shame really as the plasterer and decorator had only been in the week before..
     
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  36. PEG
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    PEG Trusted Advisor

    Location:
    Manchester
    I have always used either a Klauke or Thomas Betts scoring tool,which whips round the periphery of a circular sheath,with an adjustable depth,swivelling cutter. A couple of spins,and then pull off the end,results in the sheath coming off like an onion skin.

    Same tool will do many sizes,and flexible cables,spring loaded design,blade can be replaced,although i never have,just dressed up with a DMT hone.

    If i was demonstrating the benefit of such a tool to students,i would get them all to strip 6" of the sheath,on a 12" piece of SWA,using standard knifes,etc.

    I would then strip 3" off the other end,using my favoured weapon. Both ends can then be coated in a weak acid solution,to speed up simulated corrosion,and left for a week or so.

    When the remaining sheath is removed,it is obvious,which process is the most beneficial.

    ....Or,i could just accept the frequent advice,regarding getting either "out more" or "a life" :):):)
     
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  37. telectrix
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    telectrix Scouser and Proud of It Trusted Advisor

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    with SWA, i use the CK armourslice. first to score the armour prior to breaking off, then approx. 1" back to cut the outer sheath. all done in one operation.
     
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