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 Post subject: Wiring lamps
PostPosted: Thu May 04, 2017 7:17 pm 
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Hi, I have been looking at using these fittings for some lamps I was planning. Could anyone advise if they should be earthed? Although the outer shell is metal the bulbholder is ceramic and CE marked but they dont appear to have an earth tag. Thanks, Jim Image


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 Post subject: Re: Wiring lamps
PostPosted: Thu May 04, 2017 7:39 pm 
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:welcomeuhm:

Let's be clear. Although the ce mark is applied the ce mark could mean "Chinese Export.

If it's a double insulated light fitting then there should also be another symbol on either the packaging or the fitting which is a square within a square...

I tried to upload an image but the forum said that it wasn't allowed ???

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 Post subject: Re: Wiring lamps
PostPosted: Thu May 04, 2017 7:56 pm 
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Cheers .... you have a point about the CE! This is the fitting assembled from the bottom. I'm not too clear on 'double insulated' ... there is just the thickness of the ceramic between the screw and the metal outer. Jim Image


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 Post subject: Re: Wiring lamps
PostPosted: Sun May 07, 2017 10:40 pm 
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I have many times when PAT testing failed items because although one part was Class II or double insulated it was not all Class II, being plastic your normally safe enough to assume it is all Class II but when there is a load of metal it still can have nylon sleeves up tubes and other precautions which mean they are still Class II, but here's the rub, some where the whole assembly has to be tested and passed as Class II, not just one small bit.

I had this with mag mount drills, the drill was Class II, but the mag mount was Class I, so in your picture the inner is Class II, but the outer could be Class I, on the box it should show Image if it's Class II, in real terms depends where it is being used, in a work environment unless it shows the sign then I test as Class I, at home I use common sense, at home I know every socket and all lamps are RCD protected, should the lamp get damaged it will likely trip the RCD before it has chance to give anyone a shock, but at work I would never take the chance.

In your example what I find odd is it's a screw bulb, what one hopes with any screw bulb is the screw is neutral and centre line, if this is not the case the screw on the bulb could be line, and that metal could short out to the metal of the lamp holder, it would all depend on the bulb design, and you can't really be sure a bulb with and extended metal screw thread or no objects could not be dropped and short between threads and metal, and although in the UK we have polarity on our plugs, we are still in Europe and they have reversible plugs, so you can't be sure the thread is neutral. So I would say it needs an earth.


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 Post subject: Re: Wiring lamps
PostPosted: Mon May 08, 2017 11:25 pm 
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Even if it is double insulated earthing wouldn't do any harm.

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 Post subject: Re: Wiring lamps
PostPosted: Mon May 08, 2017 11:35 pm 
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But it has no earth terminal

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 Post subject: Re: Wiring lamps
PostPosted: Tue May 09, 2017 5:27 pm 
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I'd put a ring on under one of the screws of the mounting bracket( where it attaches to the holder), or even between the threaded part and a nut.. :wink: I might even pop rivet a tag on.

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 Post subject: Re: Wiring lamps
PostPosted: Tue May 09, 2017 8:41 pm 
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someone-else wrote:
But it has no earth terminal



I think it does

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