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Old 07-02-2012, 02:50 PM   #1
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Default Reasons for voltage loss?

Troubleshooting a couple light fixtures that had the lamp holders blown out in an office building and found that the voltage at the fixtures was 96V to ground/neutral. Checked voltage at the breaker and got 117V. The run is only about 75 feet but it does splice at a couple boxes before the fixtures that burned out. Thinking that there must be a bad splice somewhere but I am not the buildings electrical vendor so I had to bow out before I dug to deep. Still would like to know what the likely problem for the voltage drop is.

Thanks in advance!
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Old 07-02-2012, 03:35 PM   #2
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Multi-wire branch circuit? If so neutral issue.
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Old 07-02-2012, 03:41 PM   #3
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Multi-wire branch circuit? If so neutral issue.
Yes three phase 208/120. Can you define neutral issue? My first guess was a loose neutral in one of the boxes....
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Old 07-02-2012, 05:02 PM   #4
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Yes three phase 208/120. Can you define neutral issue? My first guess was a loose neutral in one of the boxes....

Start at the panel and work your way ot. TURN OFF ALL LOADS, what you have is a potential equipment destroyer and fire hazard.
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Old 07-02-2012, 05:15 PM   #5
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Start at the panel and work your way ot. TURN OFF ALL LOADS, what you have is a potential equipment destroyer and fire hazard.
That was my plan but I had to let the buildings electrician do the troubleshooting.

The light fixtures (Special Italian made things) toasted. Cost to replace $4000 a fixture....
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Old 07-02-2012, 05:22 PM   #6
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Agreed loose neutral somewhere and that = heat and potential fire.
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Old 07-02-2012, 05:23 PM   #7
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Are halogen lamps dimmable? Could not find the switch but this could very well be the problem.
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Old 07-02-2012, 05:35 PM   #8
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Yes, but not all. If theres no kind of transformer or ballast in between, if there is it also has to be compatible with a dimmer. So in short most are but not all.
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