Subpanel and electric heat verification

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Old 05-07-16, 03:30 PM
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Subpanel and electric heat verification

It's been awhile since a did one of these and want to make sure I have the correct wire sizes.
Connecting a GE subpanel direct lug to a siemens panel. The subpanel is a 125 amp panel direct lug.
I am installing a 100 amp DP breaker in the main and running four 2 guage thhn standard wire to the subpanel. 2 hots, neutral and ground. I removed the bonding screw in the panel.
I planed on running the wires through grey plastic elbow conduit. The main panel is in a corner and mounting the sub on the other corner fits perfectly with the conduit. Is it OK to use the plastic conduit? I have pressure treated 2x4s with a sheet of osb on the wall to mount the panel.
I am running two 4000 watt fan forced heaters from the subpanel. These I have on separate 30 amp dp breakers and am using 10/2 nmb wire (orange Romex).
Does this sound correct? Is the plastic elbow conduit acceptable? Is the 125 amp panel ok with the 100amp breaker?

Thanks in advance.
 
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Old 05-07-16, 03:49 PM
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Since you are running a ground wire.... PVC is ok to use.
10-2 is good for the heater wiring.
By gray plastic elbow do you mean an LB ?

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Old 05-07-16, 03:55 PM
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All sounds good to me. PVC conduit is fine. No problems using a 100 amp breaker to feed 125 amp panel. Breaker and wire size appropriate for the heaters. Use an LB, LL or LR as appropriate if the conduit has to change direction.
 
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Old 05-07-16, 04:01 PM
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No just a 90 degree elbow....a solid straight curved piece like this:
Carlon 2 in. 90? Sch. 40 PVC Elbow UA9AJB-CAR at The Home Depot - Mobile

with the flanged end cut off and a glued threaded connector on each end through the knockout on the main and sub
and locked to the panels with nut on the inside. The elbow fits perfectly around the corner from ome to the other.
 
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Old 05-07-16, 04:09 PM
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Just buy a regular 2" PVC sweep. It won't have the bell end on it.

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Old 05-07-16, 07:06 PM
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Is the #2 copper? The ground can #8 if copper.
 
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Old 05-12-16, 05:25 AM
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If I decide to mount the panel on the other side and attach the sub to the main with a straight shot of EMT, I can then skip running the ground wire..correct? ( I Would then just run the two hots and nuetral.)

I would still need to have a separate bus for the neutral and ground in the sub panel and also make sure the bonding screw is removed from the neutral.

Thanks again for the verification.
 
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Old 05-12-16, 07:58 AM
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I would still run the ground wire.... even with metal conduit.
 
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