sub panel ground and neutral
I have a question about the ground and neutral on a sub panel---everything I've read on here says that the neutral and ground has to be seperate in the sub panel. It looks like in my main 200 amp panel I have the large ground wire coming in that attaches to a ground bar for each side. That bar(s) has neutral and ground attached to it. So I would run two wires from that bar in the main panel to the sub panel. One wire for neutral and one wire for ground. Then attach the ground wire and neutral wire to seperate bars inside my sub panel. It looks like the inside of the sub panel has three ground bars. Two on the side seem to be attached and the one at the bottom is all by itself. If this is correct does it matter which one I use for the ground? and what size wire should I use for the ground?
also what size wire should I use for the two hot wires from the main panel feeding the sub panel? 100 amp to 100 amp
and last but not least can I run all the wires from the main panel to the sub panel in one conduit and what type of conduit do you recommend?
The top bars are the neutral bars. Neutrals ONLY.
Be sure to remove that green screw in the middle of the connecting bar.
Bottom bar is the ground bar. Grounds ONLY.
Depending on your area and local codes you can run 2/2/4/6AL conductors, or 4/4/6/8CU conductors.
Many areas now require #1AL or #3CU.
In a general sense, the terminal strip (bus bar) for the neutrals in a subpanel must not have a metallic connection or path (bonding) to the panel frame (can); rather it must be held on with plastic brackets.
The ground bus bar must be so bonded, either by being affixed directly to clean bare metal or jumpered using a length of wire (pigtail) or a screw or a strip of metal.
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