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  • FIRST POST
    • Hennymore
    • By Hennymore 9th May 18, 9:48 PM
    • 30Posts
    • 6Thanks
    Hennymore
    Best way to ground a wall light without a ground screw?
    • #1
    • 9th May 18, 9:48 PM
    Best way to ground a wall light without a ground screw? 9th May 18 at 9:48 PM
    I have some older metal wall lights that I want to install.

    I have live, neutral and ground coming out of the wall, but the lights only have live and neutral wires. Thereís no convenient hole, loop or screw to attach a ground wire.

    Iíve tried soldering a loop of wire onto the back of a lamp but it came off. I donít know much about soldering, so maybe I made some silly mistake, or soldering is not a good way to attach stuff to a fairly flat bit of metal.

    I canít think of a place to drill a hole straight through without it looking bad.

    Any suggestions for a good way to attach the ground wire? A very short screw of some sort?
Page 1
    • macman
    • By macman 9th May 18, 10:14 PM
    • 41,889 Posts
    • 17,377 Thanks
    macman
    • #2
    • 9th May 18, 10:14 PM
    • #2
    • 9th May 18, 10:14 PM
    Small self tapping screw?
    PS: it's earth, not ground.
    No free lunch, and no free laptop
    • coffeehound
    • By coffeehound 10th May 18, 12:19 AM
    • 1,382 Posts
    • 2,227 Thanks
    coffeehound
    • #3
    • 10th May 18, 12:19 AM
    • #3
    • 10th May 18, 12:19 AM
    Is there anywhere to incorporate something like

    https://www.ebay.co.uk/itm/Top-Quality-Screwed-Earth-Tag-Terminals-10mm-or-1-2-Packets-of-10/310729046843
    • coffeehound
    • By coffeehound 10th May 18, 4:13 PM
    • 1,382 Posts
    • 2,227 Thanks
    coffeehound
    • #4
    • 10th May 18, 4:13 PM
    • #4
    • 10th May 18, 4:13 PM
    Or perhaps trap a ring terminal between the metal light fitting and the wall over the fastener that holds it to the wall. Not ideal but better than nothing.

    If you wanted to attach an earth stud or similar to the metal fixture itself, you'd need to braze or use a very large soldering iron to get it hot enough.
    • Risteard
    • By Risteard 10th May 18, 7:50 PM
    • 779 Posts
    • 272 Thanks
    Risteard
    • #5
    • 10th May 18, 7:50 PM
    • #5
    • 10th May 18, 7:50 PM
    Is the luminaire Class I or Class II?

    If it's Class I and has no provision for protective earthing then it cannot possibly comply with any Standard and should not be used. If it's Class II then it shouldn't be earthed.
    • Ectophile
    • By Ectophile 10th May 18, 9:26 PM
    • 3,121 Posts
    • 1,990 Thanks
    Ectophile
    • #6
    • 10th May 18, 9:26 PM
    • #6
    • 10th May 18, 9:26 PM
    If they are marked as double insulated (class II), then they shouldn't need earthing. Just make sure the live and neutral wires won't come adrift and touch anything.


    Soldering to big lumps of metal is very difficult. The metal just absorbs all the heat the soldering iron can put into it.


    If the things are being screwed to a wall, is there somewhere hidden that you can drill a small hole? Then stick a countersunk screw through, and a nut, washer and solder tag on the inside.
    If it sticks, force it.
    If it breaks, well it wasn't working right anyway.
    • EachPenny
    • By EachPenny 10th May 18, 11:06 PM
    • 4,944 Posts
    • 13,194 Thanks
    EachPenny
    • #7
    • 10th May 18, 11:06 PM
    • #7
    • 10th May 18, 11:06 PM
    Iíve tried soldering a loop of wire onto the back of a lamp but it came off. I donít know much about soldering, so maybe I made some silly mistake, or soldering is not a good way to attach stuff to a fairly flat bit of metal.
    Originally posted by Hennymore
    The shape of the metal isn't really an issue, the type of metal is far more important. At a guess the wall light is likely to be steel or some form of aluminium alloy. It is very difficult (if not impossible) to get standard electrical solder to form a good joint with these metals. Specialist solders are available, but quite often requiring very high temperatures to melt and form the joint. The other thing is if the lights are old then the metal is likely to be highly oxidised and would need careful cleaning before any kind of soldering would work.

    However, I'm of the same opinion as Risteard. If it doesn't have a terminal for an earth wire then it either doesn't need earthing or else you need to treat it as potentially unsafe and inadvisable to use. If it isn't marked as Class II and you don't have the expertise to work out if it is, then the latter option is the only safe way to go.
    "In the future, everyone will be rich for 15 minutes"
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