Jea 48,
Sub panel is connected to the main one with 4 AWG wire, with Black, White, Red and naked copper ground conductors.
Breaker in the main panel, feeding the sub panel is 60.
The wire he used for dedicated circuits has Black, White and naked copper ground conductors, so I guess, I mistakingly called it 12/3.
All five dedicated circuits feed 5 duplex receptacles, that is correct.
I don't think, that the ground bar in the sub panel is isolated from the panel metal enclosure.
Yes, sub panel ground bar IS connected to the main panel ground bar.
Also main panel ground bar is connected to an additional
copper rod, installed at the same time, as the sub panel.
And one more thing: I noticed, that a small connector box with TV and Internet cables, has a ground wire, connected to the main panel ground bar.
I have two questions:
1. When evrybody says "isolated ground" does it mean ground bar in the panel isolated from the metal enclosure?
And, if it's not isolated from the panel (like in my case, it seems), would that be a problem causing ground loop?
2. You'd have to forgive me, but I'm not entirely clear about the last part of your post;
"More than likely here is your problem. Just bet you have a difference of potential, voltage, between the equipment ground at the receptacles and the neutral, the grounded conductor.
Per NEC the feeder equipment grounding conductor shall be installed in the same cable, or raceway, as the feeder current carrying conductors. And the equipment grounding conductor shall terminate in the same panel the feeder is fed from".
And how exactly should I correct this problem?
Thanks a lot for taking your time- it's really priceless.
Sub panel is connected to the main one with 4 AWG wire, with Black, White, Red and naked copper ground conductors.
Breaker in the main panel, feeding the sub panel is 60.
The wire he used for dedicated circuits has Black, White and naked copper ground conductors, so I guess, I mistakingly called it 12/3.
All five dedicated circuits feed 5 duplex receptacles, that is correct.
I don't think, that the ground bar in the sub panel is isolated from the panel metal enclosure.
Yes, sub panel ground bar IS connected to the main panel ground bar.
Also main panel ground bar is connected to an additional
copper rod, installed at the same time, as the sub panel.
And one more thing: I noticed, that a small connector box with TV and Internet cables, has a ground wire, connected to the main panel ground bar.
I have two questions:
1. When evrybody says "isolated ground" does it mean ground bar in the panel isolated from the metal enclosure?
And, if it's not isolated from the panel (like in my case, it seems), would that be a problem causing ground loop?
2. You'd have to forgive me, but I'm not entirely clear about the last part of your post;
"More than likely here is your problem. Just bet you have a difference of potential, voltage, between the equipment ground at the receptacles and the neutral, the grounded conductor.
Per NEC the feeder equipment grounding conductor shall be installed in the same cable, or raceway, as the feeder current carrying conductors. And the equipment grounding conductor shall terminate in the same panel the feeder is fed from".
And how exactly should I correct this problem?
Thanks a lot for taking your time- it's really priceless.