1

These 3 wires connect this main disconnect to my sub panel in the back of the garage that powers the whole house. It runs in a conduit that serves as the ground between the sub panel and the enclosure in this picture. I am replacing the cable/conduit with a 4 wire SER cable (separate ground). How would the ground in that new cable attach to this enclosure? Neutral and ground can be bonded since this is a main panel but there is no lug available and no space on the tiny bar that’s there. Can I drill and tap a lug to the enclosure? Doesn’t seem right...

enter image description here

enter image description here

  • Can you post a clear photo of the labeling on the disconnect box? – ThreePhaseEel Nov 12 '17 at 6:29
  • Also, why are you replacing wires in conduit with a cable? – ThreePhaseEel Nov 12 '17 at 6:30
  • I can add a picture of the inside label but I have reviewed and it only covers the connections shown. No mention of a ground wire that I can see. I am replacing conduit that runs below ceiling level as part of a garage finishing project. – gorms Nov 12 '17 at 7:02
  • is the conduit actually in the way of anything? If not, I'd just get an appropriate paint and finish the stuff a nice color (matte black maybe?) instead of ripping it apart and replacing it with a cable – ThreePhaseEel Nov 12 '17 at 7:08
  • We'll want to see the label anyhow -- it'll tell us make/model of the box, if nothing else. – ThreePhaseEel Nov 12 '17 at 7:10
1

So I think I am going to mount a small ground bar to the panel under the breaker and add a lug to that bar. Neutral and ground will be bonded through the enclosure.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.