There is an old building that I need to add a 50 amp 220 outlet to. This building gets its electricity from another building, from a 60 amp breaker in the other buildings main panel. The old building has a new Square D breaker box in it, and it already has a 50 amp 2 pole breaker in there. But there is no wire going from the breaker, it‘s just sitting in the fuse box. I can‘t see any sort of ground or green wire in the fuse box, all the outlets in the old building just have 2 prong receptacles.Can I put the ground wire of the 220 outlet to the neutral bar, or should I try to make some sort of ground?
In a separate building, there first must be a main disconnect installed at the feeder panel (sub-panel), there must also be a ground rod driven at that location and that must be bonded to the ground bar of the sub-panel. The neutral connection must not be attached to the cabinet (remove the Main Bonding Jumper - usually a green screw through the neutral bar), and add a ground bar that is listed for that panel; all grounding conductors must terminate on the ground bar. A #6 AWG Copper conductor will be plenty large enough to go to the ground rod with, you can get by with a #8; it must be a continuous wire, without a splice.
The new breaker box needs to be grounded-normally with a copper rod driven into the ground and tied in with a copper wire from the left hand side of the box (neutral) as you are looking at it. If it is grounded you can run 220 from the breaker box with romex cable. Depends on how far the run as to what gage wire you might need. Just tie in black wire to 1 side and white to other side of breaker and the neutral to the bare wires on the left side of the breaker box. My big concern is that the main on the other building only has a 60 amp breaker and if you use the new outlet it may well trip that breaker. If I saw exactly what you were doing I good give better advice, but if you are not sure get a Professional
