Arrow Hart Murray main panel and adding a subpanel on the new building
#1
03-17-13, 09:24 PM
Arrow Hart Murray main panel and adding a subpanel on the new building
Hey all,
The workshop build is coming along nicely, and we're planning for the electric service.
The house itself is served by a panel with "Arrow Hart Murray" on the cover, it's an integrated service entrance/meter/breaker panel unit. The breakers are arranged in two horizontal rows, rather than two vertical rows. There's an unused position in the top row next to a single-pole breaker that's unused, and the bottom row has a couple of positions that were previously in use for a pool that is now no longer present.
I'm assuming that a pair of hot wires, a neutral wire, and a ground wire will need to be pulled through the in-ground conduit, and that the two hots and the neutral will need to be sized the same, and that the ground can be sized a little smaller. I'm currently planning on 2AWG THWN for the hots and neutral, and 8AWG for the ground...
The new building foundation does have ground. I assume that even with this, I need to bond the grounds together and to the sub panel itself, but the neutral needs to be non-bonded, letting that occur in the main panel only...
I'm sizing this for 100A total. The workshop will have an air compressor, a vehicle lift, an evap cooler, a couple of circuits of lights, and at least two, possibly four electrical circuits for outlets.
The workshop build is coming along nicely, and we're planning for the electric service.
The house itself is served by a panel with "Arrow Hart Murray" on the cover, it's an integrated service entrance/meter/breaker panel unit. The breakers are arranged in two horizontal rows, rather than two vertical rows. There's an unused position in the top row next to a single-pole breaker that's unused, and the bottom row has a couple of positions that were previously in use for a pool that is now no longer present.
I'm assuming that a pair of hot wires, a neutral wire, and a ground wire will need to be pulled through the in-ground conduit, and that the two hots and the neutral will need to be sized the same, and that the ground can be sized a little smaller. I'm currently planning on 2AWG THWN for the hots and neutral, and 8AWG for the ground...
The new building foundation does have ground. I assume that even with this, I need to bond the grounds together and to the sub panel itself, but the neutral needs to be non-bonded, letting that occur in the main panel only...
I'm sizing this for 100A total. The workshop will have an air compressor, a vehicle lift, an evap cooler, a couple of circuits of lights, and at least two, possibly four electrical circuits for outlets.
#2
03-17-13, 09:38 PM
Oh, it looks like SER cable might be a better choice... 2-2-2-4 cable is apparently available, would that actually be the best choice? Conduit will be 2" PVC in the ground...
#3
03-17-13, 09:58 PM
Group Moderator
Depending on the length it might be a little light. However.....SER is not rated for underground use. You would have to use USE (underground service entry) and I don't think you can pull USE thru pipe.
Personally I'd stick with the three #2 THWN's and one #8 THWN. If you were to use aluminum it really should be #1
You will also need ground rods at your shop panel.
Personally I'd stick with the three #2 THWN's and one #8 THWN. If you were to use aluminum it really should be #1
You will also need ground rods at your shop panel.
#4
03-18-13, 12:45 PM
Okay, got it, no SER.
When the shop foundation was built the ground was installed...
I assume that this will be enough...
We're going to find a subpanel that fits nicely between the two studs if possible.
When the shop foundation was built the ground was installed...
I assume that this will be enough...
We're going to find a subpanel that fits nicely between the two studs if possible.
