Help - Grounding a Vintage Table Lamp (1930 or 40s)


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Old 04-04-14, 09:20 AM
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Question Help - Grounding a Vintage Table Lamp (1930 or 40s)

Hi, I am new here and would like a little bit of help .


I have got a really nice lamp that I would like the rewire and use. The lamp is made my a dugdill (see picture on google) and is all made from iron with ceramic fitting and the wire going in out of the frame. The lamp is very easy to wire up, but there is no where to ground the lamp.

So my question is, does it need be grounded and if it does, how would i go round doing that.

Thanks and any help would be appreciated
 
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Old 04-04-14, 09:25 AM
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Lamps don't need grounding however you should use a polarized plug and be sure the wide blade connects to the shell not the tab.

Edit: Thanks to Nash just noted you are non U.S. so above may or may not apply.
 

Last edited by ray2047; 04-04-14 at 12:13 PM.
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Old 04-04-14, 11:52 AM
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you should use a polarized plug and be sure the wide blade connects to the shell not the tab.
To expand a bit, the shell and the tab are the two parts of the lampholders, or sockets, that the bulbs are screwed into. The point is to make sure that the threaded shell is connected to the grounded conductor - the neutral, which is differentiated by having a wider slot in the receptacles used in the U.S. - and that the ungrounded power, or the hot wire - is connected to the brass tab in the bottom of the socket. This is done for safety, to reduce the risk of shock.

Most lamp cord has ridges molded into the insulation for one of the two wires. By convention, that conductor is used for the neutral and the smooth one is used for the hot power. But you may want to use a vintage plug and cord on this lamp. If so, be sure the plug is polarized.
 
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Old 04-04-14, 12:15 PM
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Thank for the reply and for the information, but the problem is that I am from the UK. I am sorry, I complete for got to mention that.
 
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Old 04-04-14, 12:41 PM
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Thank for the reply and for the information, but the problem is that I am from the UK.
Then you have 230V AC hot-to-neutral. All the more reason to make sure the hot power stays in the bottom of the socket.

Is there a standard way to make sure that one prong on the plug is always connected to hot and the other to neutral in the UK? How is that done on a modern lamp, or is it?
 
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Old 04-04-14, 01:15 PM
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My quick look indicated that they usually use an earthed plug so that should be as good as polarized and now were back to the original question. How to ground the lamp.
 
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Old 04-04-14, 01:21 PM
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If there's a convention for which of the two power slots is neutral, you could use a 2-wire cord and a 3-prong plug. No ground, but polarized.
 
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Old 04-04-14, 01:50 PM
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Here is a UK forum thread that might offer some help: Domestic Table lamp with no earth.. | | Electricians Forums
 
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Old 04-04-14, 04:39 PM
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The blue wire is what goes to the socket shell. If there's no exposed metal I would just use a 2-core cable.
 
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Old 04-04-14, 06:27 PM
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In all the pictures I found online for this type lamp they all look to be using a two wire lamp cord.

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Old 04-04-14, 07:34 PM
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Yes, but are those UK lamps? I found the same thing, but I haven't found a UK-specific example.
 
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Old 04-04-14, 08:49 PM
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That lamp in my picture was on eBay/UK. There are more on eBay/UK and they all use the same type two wire twisted cable.

It would be pretty rare to see any table lamp have a ground wire on it.
 
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Old 04-04-14, 09:38 PM
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Got it, and agreed. Thanks.
 
 

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