polarity problem?

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  #1  
Old 09-16-00, 06:28 AM
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I have a problem with a switched ceiling light fixture. I replaced the switch last week with a dimmer, that worked fine. I tried to install a new light fixture. The wires are old (70yrs) and one appeared to have white paint on it I hooked the white wire to this one and the black to the remaining wire. When I turned it on the light came on but the dimmer made a pop and appears to have burned out. Is this a problem with polarity? How can I check to see which of these wires is really hot?
 
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Old 09-16-00, 10:25 AM
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Q: How can I check to see which of these wires is really hot?

A: With a voltmeter.

Almost all of the lighting circuit wiring problems people report here could be avoided if the homeowner had a voltmeter and knew how to use it.
 
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Old 09-16-00, 10:44 AM
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In order to identify the hot you can touch one prong of the voltmeter to the bare grounding wire, and then touch the other prong of the volt meter to each wire to find hot. The hot wire will show 120 volt when the other prong is touching the bare grounding conductor. The white wire should show continuity but no voltage.

Hope this helps.

Wg
 
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Old 09-16-00, 12:04 PM
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<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by wgoodrich:
In order to identify the hot you can touch one prong of the voltmeter to the bare grounding wire, and then touch the other prong of the volt meter to each wire to find hot. The hot wire will show 120 volt when the other prong is touching the bare grounding conductor. The white wire should show continuity but no voltage.

Hope this helps.

Wg
<HR></BLOCKQUOTE>

Thanks. I got a voltmeter and did it. The problem is solved
 
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