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Old electircal wiring in ceiling lighting ... which one is white and black ?

Old electircal wiring in ceiling lighting ... which one is white and black ?

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  #1  
Old 04-19-14, 02:15 PM
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Old electircal wiring in ceiling lighting ... which one is white and black ?

Hello,

This is my first post here and wanted to mention how indeed the site can help me out as being somewhat of a handyman I just don't like messing with electrical work though.

I just pulled a lamp from the ceiling BUT forgot to mark the wiring and would like to know if anyone can tell which wire is white and black ? the wires are old but seem to have the same shaded black wrap. I nknow the obvious ground is yellow

the one on left side is somewhat thinner

Much appreciated
 
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  #2  
Old 04-19-14, 02:42 PM
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Is that a metal box with BX cable (metal wrapped cable) coming into it?if dodo you have a volt meter,analog is best?
 
  #3  
Old 04-19-14, 05:03 PM
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sorry about the missing details in that pic... here is a clearer picture of what's there and no it's not metal wrapped cable i don't think . Also
I have a tester but never used it so not sure how to test with it.
 
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  #4  
Old 04-19-14, 06:05 PM
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From a known good ground measure to each wire. The ones that read ~120v are hots. If the box isn't grounded use a grounded extension cord plugged into a receptacle with a known good ground as your reference point.
 
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Old 04-20-14, 07:52 AM
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pardon myignorance ...So the tester has a red and black pen...
Which one do I put on the wire and I guess turn on the switch to VOLT?
 
  #6  
Old 04-20-14, 08:40 AM
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One to ground and one to the wire being tested. For AC it doesn't mater which to which. Be sure the battery is good by testing a working receptacle first.
 
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