This panel is in a workshop next to house and is fed by 3 conductor feeder from a 40amp breaker in main panel. Is this a amateur electrician home owners attempt at a subpanel (obviously done totally wrong) or can this be a Remote distribution panel done by an electrician? This is my first picture upload so hopefully it works.
It’s a “panel” or “panelboard.” Call it an electrical panel, load side panel, distribution panel, equipment panel, remote panel - whatever. The point is, it is not “service” equipment, and that’s all that really matters.
I know subpanel is a fairly common term, but it is not recognized by the NEC, and if you read through the electrical forum, you’ll see where it leads to a large amount of confusion, especially with newer inspectors.
There is “service” equipment and then there is “other” equipment.
If this is a deteched structure, and there are no other metallic paths between the house and the detached structure (phone lines, metal water lines, etc.), then it is permissible to feed that panel with 3-wire.
I was only addressing one matter, which was the 3-wire feeder. In the past, when I’ve addressed the entire photograph, I get blasted for providing too much information. Now, I only address one portion, and I get “but… also…”. I have no idea which set of rules to follow.
OK Jeff I think I understand. Let me try to ask this question another way. Is there anything wrong with this panel being supplied by a 3 wire conductor from another panel? I think the neutral ground conductors and the grounding conductors should be isolated in this workshop panel and a fourth conductor (a dedicated grounding conductor) should have been ran to this workshop panel from the main panel and I think this workshop panel should also have its on grounded electrode. Help me out me, am I correct? I hope I my terminology is correct.
It can be difficult to verify “no other metallic path.” That’s why I say defer a 3-wire feed.
In your picture, it’s wrong, no matter what. If it’s a proper 3-wire feed, that G/N bus needs to be bonded to the enclosure. Also, it does not appear that there is a grounding electrode (rod/pipe) for that panel, which would be required in either case.
The disconnecting means for that panel (in a 3-wire feed) should disconnect all three conductors - essentially, a three-pole breaker or switch.
I count “six” ground wires connected to the neutral/ground bar and “six” wires entering the panel (including the wire feeding the panel). This indicates to me that it is a "four-wire feed. The neutrals and grounds need to be isolated and the panel needs to be bonded. Harry-homeowner hard at work:D