I have two 200 amp panels servicing my house. Am I permitted to install a 200 amp breaker in a 200 amp panel to feed an outbuilding under construction? Have never heard if a panel may have a breaker fed with the same amperage as the panel feed breaker..
Thanks for your help.
Yes it is allowed. In fact if a sub-feed lug set is available for your brand panel, another breaker would not be necessary as the main of the panel would protect the sub-fee conductors provided they are rated for 200 amps as well.
They probably are not in the panel, they would be an accessory. It is also unlikely that the panel will accept a 200 amps breaker for a sub-feed.
Check the info on the panel label.
Siemens panel with QP breakers. I found a 4-pole 200 Amp QP breaker on-line. Have plenty of space in the panel. I'll see if I can find the lug accessory to avoid buying a redundant breaker.
Also, since this is residential, I believe I can use 2/0 for the two feeds & 1/0 for neutral. Copper. The sub-panel being fed can be grounded with 10 gauge solid to the ground rod at the outbuilding.
Do you agree?
SW Florida. Was hoping to run 2 2/0 hots off the breaker or sub-feed lugs, 1 1/0 neutral off the buss and not string another ground through the conduit. Was going to sink a copper ground rod at the sub-panel.
Most residential panels will not accept a branch breaker larger than 100 amps.
Check the specs of your panel to make sure.
Code only allows the use of 2/0 copper to feed the first disconnect.
You will need 3/0 to feed the sub panel 200 amps from the main panel.
Run the forth wire.
What is your anticipated neutral load? You can install as small as a #4 neutral on a 200 Amp feeder, depending on its greatest possible unbalanced load.
Your equipment grounding conductor must be at least a #6 copper as well. A #10 ain't going to cut it here.
I don't have a large RV but the workshop I'm building can hold one - I think they have 50amp 110V feeds, which is a ridiculous way of using power, but it is what it is. I know they have 30amp 110 feeds. So, I guess it would be a possible 50 amp load on the neutral. If I have to use 3/0 for the subpanel hots I'd use a 2/0 for the neutral.
I've been told to run at least a #6 for the ground down the conduit with the 2 hots & neutral. Can do. I also believe 1 8' copper ground rod at the sub-panel will suffice. Thought I'd use the same AWG as the neutral to connect the ground rod to the panel ground. That may be overkill since my house feed to 2 200 amp panels is 2 runs of 3/0 with 2/0 neutrals. A single ground rod is near this pair of panels with a 1/0 or 2/0 tied to it.
Thanks for your help - can to comment on my wire size thinking? I was going to use 2/0 hots but was told the sub-panel has to be a size larger than the feeds to the main panel(s). Neutral typicaly 1 size smaller..
I.... I think they have 50amp 110V feeds, which is a ridiculous way of using power, but it is what it is. I know they have 30amp 110 feeds. So, I guess it would be a possible 50 amp load on the neutral. If I have to use 3/0 for the subpanel hots I'd use a 2/0 for the neutral....
Larger RVs have a 50 Amp 240 Volt feed, using a standard range cord configuration NEMA 14-50.
Using a 2/0 for your panel feeder neutral will be sufficient in any case.
...I've been told to run at least a #6 for the ground down the conduit with the 2 hots & neutral. Can do. I also believe 1 8' copper ground rod at the sub-panel will suffice. Thought I'd use the same AWG as the neutral to connect the ground rod to the panel ground. That may be overkill since my house feed to 2 200 amp panels is 2 runs of 3/0 with 2/0 neutrals. A single ground rod is near this pair of panels with a 1/0 or 2/0 tied to it....
A ground rod is only capable of dissipating a limited amount of juice. Using anything larger than a #6 is a complete waste of resources, since the ground rod can't handle any more. This has been tested and confirmed by independent labs, and the Code recognizes this limitation. :whistling2:
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