Non-contact voltage tester

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  #1  
Old 03-19-16, 04:23 PM
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Non-contact voltage tester

Last week I was on a roof doing some RTU change outs. The HVAC guys were trying to find the breaker to turn them off using a non-contact tester. They could not find the correct breaker until I grabbed the tester, held it out in mid air, and showed him that it would still beep and flash. We were next to the highway with some of those really tall power line towers. The tester was detecting them about 1/4 mile away. How's that for a magnetic field!
 
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Old 03-19-16, 04:28 PM
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They have their use. Detecting the presence of power in boxes, etc. Beyond that, nope. You would have to isolate it further with a multimeter. In your instance with all the inducted fields, worthless.
 
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Old 03-19-16, 06:48 PM
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It's strange. I have a pen tester that is very accurate. Of course I always check with a meter before touching bare wires.
The tester is so accurate it can identify through the sheathing which side of a 2 conductor cable is hot, it won't alert when held to the neutral.
 
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Old 03-19-16, 07:18 PM
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The tester is so accurate it can identify through the sheathing which side of a 2 conductor cable is hot, it won't alert when held to the neutral.
That only works when the white wire is used as a neutral (grounded conductor).
 
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Old 03-19-16, 10:37 PM
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Only time I use one is on a fire scene to know when the power company has cut the power.
 
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