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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...

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gorms
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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.

gorms
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