![]() So it is too small for a 100A feeder, maximum would be 90A. Zooming in on the photo, that cable says 2 AWG Al, not 2/0 AWG. In these conditions, 83 of 100 amps is 83 amps, so the wire size can handle at least 83 amps. You might as well pull 3 circuit conductors for a 120/240V feeder.Ĭonduit sizing is another question, you can look up a calculator to get the minimum size. The minimum wire size for a 100 amp sub-panel is 4 AWG copper or 2 AWG aluminum according to the 83 rule, which defines that the wire size can handle 83 of the amperage of the sub-panel. For a 60A feeder, you could use #6 Cu or #4 Al circuit conductors, with a #10 Cu or #8 Al EGC. If you want a full 100A feeder (may be overkill for the loads), then you'd need to use #3 Cu or #1 Al circuit conductors, and a #8 Cu or #6 Al EGC. Since you're going to install a complete PVC conduit system from panel to panel (maximum 360 degrees of bend between pull points), you're better off pulling individual wires (THWN) through the conduit. Type SE cable is prohibited underground, so you can't use that cable. You definitely need a grounding electrode system at the garage. Is this subpanel in the same building as the originating panel, or is it in a detached structure? For the latter, you need to install a grounding electrode system at the detached structure.Ĭlick to expand.OK, I take that to mean a detached garage, and that the PVC will be underground. You are probably better off getting the typical cable with the additional insulated conductor and installing things normally. In which case you would be wise to prominently label the panel "120V only, no multi-wire branch circuits".īasically, it will all work, it will just be very unusual. Or you can get a 3-port Polaris style connector so that you can run jumpers to both lugs from your single incoming hot conductor. On the subpanel you can either just land the hot on one of the two lugs and only use half of the spaces (you'll need to figure out which one). You can supply the cable with a 100A breaker, but the breaker will presumably be double pole and you'll only use one of the two lugs for your single hot. You'll use the bare as EGC, label one of the insulated white and use it for the neutral, and use the other insulated for your hot. OK, you can use your cable for a 120V only panel, it will just have half the capacity versus having the extra conductor in your cable. The appropriate wire gauge for a sub panel dealing with 100-amps is 2 AWG for aluminum cables.
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