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I have a large lamp with a metal frame which is not grounded(which I thought is a legal requirement for metal framed appliances in my country, but perhaps not).

Is there any risk if I swap out the 2 core cable with one that contains an earth, and ground the frame?

Am I'm being paranoid?

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    I don't think I've ever seen a grounded lamp in the US, but that in itself isn't really an answer. – JPhi1618 Apr 7 '16 at 21:29
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Is it safe? Assuming your ground isn't faulty, yes. But there's no need.

In order to meet code, an appliance with an ungrounded metal frame needs to be double insulated: that is, it needs to be designed in a way that it takes two failures for the exposed metal to become electrically live. For example, in your lamp this could take the form of insulated wires plus a non-conductive paint on the inner surface of any metal the wires might contact if they broke.

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    Ok, that makes sense, thanks. One minor followup, when I rub my hand along it I can feel a slight buzz/friction, which is what prompted the post in the first place. Still good? – jasper Apr 7 '16 at 21:45
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    I would argue that it's possible an inexpensive lamp might not have very reliable double insulation. When it comes to power tools, etc - I would feel comfortable relying on the double insulation. Adding a ground lead does not hurt. "Belt and suspenders". – cale_b Apr 7 '16 at 22:43
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    @jasper, there are lots of things that could cause a slight buzz. If you're not feeling any sort of tingle or shock, I wouldn't worry. – Mark Apr 7 '16 at 22:46

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