Hi all,
I'm in the midst of a electrical project (designing) before presenting to local codes. I'm wanting to daisy chain 2 sub panels from my main 200A house panel. The first panel would be an outdoor load center 150' mounted to outside of a barn. The second panel would be a interior mounted panel in a shop 360' away from the outside barn panel. I'd like to do a 80-100 amp panels but it will require big wire to the shop, thus I'd need to use 200A sized panels to accept the conductors, unless I wanted to downsize in a junction box, but I'd prefer not to. I was planning on utilizing a 200A feed thru outdoor panel at the barn because of conductor size, as well as a 200A square D QO panel in the shop. I was hoping to use 4/0 alum to the shop (360') and #2 copper to the house/barn. I'd like to keep the house to barn feeder (150') a #2 copper, because of tight space in existing panel.
When calculating VD, is it acceptable to add the VD of the first run, followed by the second run to the shop to equal a total of less than 3%? I've heard 5 percent is acceptable here... so I'm a little confused because I thought that was at the end of a branch circuit.
I'm in the midst of a electrical project (designing) before presenting to local codes. I'm wanting to daisy chain 2 sub panels from my main 200A house panel. The first panel would be an outdoor load center 150' mounted to outside of a barn. The second panel would be a interior mounted panel in a shop 360' away from the outside barn panel. I'd like to do a 80-100 amp panels but it will require big wire to the shop, thus I'd need to use 200A sized panels to accept the conductors, unless I wanted to downsize in a junction box, but I'd prefer not to. I was planning on utilizing a 200A feed thru outdoor panel at the barn because of conductor size, as well as a 200A square D QO panel in the shop. I was hoping to use 4/0 alum to the shop (360') and #2 copper to the house/barn. I'd like to keep the house to barn feeder (150') a #2 copper, because of tight space in existing panel.
When calculating VD, is it acceptable to add the VD of the first run, followed by the second run to the shop to equal a total of less than 3%? I've heard 5 percent is acceptable here... so I'm a little confused because I thought that was at the end of a branch circuit.
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