Dsg319
Senior Member
- Location
- West Virginia
- Occupation
- Wv Master “lectrician”
On a project replacing a couple sub panels.
One being the main sub panel that feeds several others.
Replace a federal pacific with a new 200amp GE. All other sub panels are old 3 wire feeders with neutral bonded at the panel.
How ever after replacing this one I noticed the conduit that feeds the sub panel was all emt. So I checked the resistance between the feeder pipe and the unhooked neutral and it was bonded back at the main disco.
So with that being said I decided to just use the EMT as an EGC and isolate the neutral in this panel (although rest of the sub panels fed from it are 3 wire feeders neutral bonded).
Should I have left it alone after being that away after so many years or was what I done correct?
I did however simulate a (bolted) ground fault on the far end of the building and it cleared probably within 3 seconds or less. Granted that was a 14gauge circuit on a 20amp breaker that has to be changed
One being the main sub panel that feeds several others.
Replace a federal pacific with a new 200amp GE. All other sub panels are old 3 wire feeders with neutral bonded at the panel.
How ever after replacing this one I noticed the conduit that feeds the sub panel was all emt. So I checked the resistance between the feeder pipe and the unhooked neutral and it was bonded back at the main disco.
So with that being said I decided to just use the EMT as an EGC and isolate the neutral in this panel (although rest of the sub panels fed from it are 3 wire feeders neutral bonded).
Should I have left it alone after being that away after so many years or was what I done correct?
I did however simulate a (bolted) ground fault on the far end of the building and it cleared probably within 3 seconds or less. Granted that was a 14gauge circuit on a 20amp breaker that has to be changed