Megging New Install

[Little Bill]

I wired a gutted house for a remodel. After I was through, the builders found some NM with the sheath missing. I can't figure how that happened because there was no bunched up sheathing like would happen if it got hung and ripped. I think it came off the spool that way.

I taped up the cables and put corrugated loom that is used for automobile wiring around them and taped again. So I think those parts are good but don't know if there is more bad places that are hidden.
Anyway, I think/feel like I need to "Meg" the circuits. I was wondering if I check with a Megger would I need to take the joints apart at the boxes? I planned on taking the EGCs and neutrals loose at the panel but wouldn't sure about at the boxes. There are no devices installed yet.

 

[ActionDave]

Devices would be okay, all breakers should be turned off, any tv's, radios, light bulbs, microwaves, aquariums, disco balls and lava lamps, all that kind of stuff needs to be disconnected.

Don't break any connections at the boxes unless you want to spend a month going around and individually megger each portion of the circuits.

 

[ptonsparky]

A megger will not find sheathing that is missing. It will not find bare conductors hanging out for the world to see. A continuity check would work if you’re looking for metal to metal contact.

 

[Little Bill]

Devices would be okay, all breakers should be turned off, any tv's, radios, light bulbs, microwaves, aquariums, disco balls and lava lamps, all that kind of stuff needs to be disconnected.

Don't break any connections at the boxes unless you want to spend a month going around and individually megger each portion of the circuits.

There is nothing installed, only rough-in wiring

A megger will not find sheathing that is missing. It will not find bare conductors hanging out for the world to see. A continuity check would work if you’re looking for metal to metal contact.

I understand that. Given I found one place with some actual insulation (not just sheathing) compromised I just feel like I should test the affected conductors at least.