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Old Jul 14, 2009 | 12:51 PM
  #1  
mzimmers's Avatar
mzimmers
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From: Cupertino, CA
home wiring oddity

Hi, all -

I figure someone here must have an idea on this.

I'm trying to extend some wiring in my attic (to add an attic fan). I've found some wiring that's immediately above a wall switch. (in the switch box there is also an unswitched wire that goes up to the attic.

Here's the weird part:

At the box, the VAC is about 122.

Five feet above, the other end of this wire meters at 68.2 VAC.

There is *nothing* between the ends of the wire.

Can ANYONE give me an idea of what the heck is going on here?

Thanks.
 
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Old Jul 14, 2009 | 05:21 PM
  #2  
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Medicmike63
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From: Salem, Oregon
Could there be a partial break in the wire causing some resistance?
 
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Old Jul 14, 2009 | 06:02 PM
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mzimmers
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I found the error. It was between my ears.

From my vantage point in the attic, I couldn't distinguish between two lines in the wall. I was actually measuring a switched line with the switch OFF (as a side bar, I wonder if that switch needs to be replaced to allow that much voltage through in the off position.)

Anyway, thanks for taking a look.
 
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Old Jul 14, 2009 | 11:55 PM
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Could be that they're switching the neutral side of the line. I'm sure that's a code violation -- and it's an awfully bad idea. You get voltage hanging around in places that are 'off'.

May be some other explanation. Can't imagine that it's a bad switch.
 
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Old Jul 15, 2009 | 06:13 PM
  #5  
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lvmadsigntist
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From: las vegas, nv
At the 5 ft point is there box or are you testing the wire?
What is the voltage from black or red to ground?
What wires are you measuring voltage across?
 
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Old Jul 17, 2009 | 08:16 PM
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Homemade
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From: madera California
might be a 3pole switch for a light that has multiple switches.
 
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