There are many posts everywhere about this, but I'm still not clear on one thing. I have a separate building about 90 feet from the house where a buried 10-2 UF cable (2 conductors and a ground wire) supplies 110v electricity for lighting and receptacles. I am going to install a sub panel in that building and convert from 110v to 220v so I can install multiple circuits, one being 220v and 3 110v. So, in the 10-2 UF supply cable, I will use the white and black wires as conductors, and the ground wire as neutral. There are no other connections, pipes, telephone lines etc. between the buildings. I understand I must install a ground rod at the outbuilding to properly ground the subpanel. In the subpanel, should the ground bus and neutral bus be connected?
Grounding a sub panel in separate building
grounding-and-bonding
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Best Answer
You cannot do this under current code. You USED to be able to do this. I suspect that proved to be a poor idea, since now you need to run a 4th conductor (hot or neutral) and maintain separated ground and neutral all the way to the service entrance.