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Old 07-09-2018, 11:31 PM   #1
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Default Testing New Construction Wiring

If you wanted/needed to test insulation with a Megger on new wiring for a house should the joints be taken apart at the boxes?
The EGCs and neutrals would be removed at the panel but not sure if the splices/joints should be taken apart at the boxes.
There are no devices installed yet.
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Old 07-10-2018, 12:04 AM   #2
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If you wanted/needed to test insulation with a Megger on new wiring for a house should the joints be taken apart at the boxes?
The EGCs and neutrals would be removed at the panel but not sure if the splices/joints should be taken apart at the boxes.
There are no devices installed yet.
Cap all loose ends of conductors or you will possible be reading shorts all over the place.
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Old 07-10-2018, 12:05 AM   #3
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Seems like you'd have to test an awful lot of points if you took every wire nut off...

If you pigtail receptacles, you'd only have to test each circuit at the breaker, and then each switch leg.

If you don't pigtail receptacles/disconnect everything, you'd have to meg each box wouldn't you?
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Old 07-10-2018, 12:23 AM   #4
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I'm really only concerned with home runs.
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Old 07-10-2018, 12:53 AM   #5
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I'm really only concerned with home runs.

And cables with the sheath missing right? Ole macmikey git's around you know...
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Old 07-10-2018, 01:13 AM   #6
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And cables with the sheath missing right? Ole macmikey git's around you know...

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Old 07-11-2018, 12:48 AM   #7
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Everything connected with any electronics and light bulbs removed, neutrals isolated from ground, power off, switches on.

You could test all the conductors at one time CBs on, L1 to neutral, L2 to neutral, L1 to L2 and Neutral, L1, L2 to ground if the reading is full scale all is good if you get a low reading turn off one CB at a time.
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Old 07-11-2018, 01:18 AM   #8
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Everything connected with any electronics and light bulbs removed, neutrals isolated from ground, power off, switches on.

You could test all the conductors at one time CBs on, L1 to neutral, L2 to neutral, L1 to L2 and Neutral, L1, L2 to ground if the reading is full scale all is good if you get a low reading turn off one CB at a time.

I did the test today and thankfully everything checked out.

I didn't have any breakers installed yet so I checked each circuit.
But that is a great idea to check with the breakers. That would save a lot of time.
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