So in summary, my suggestion is, even if not fully responsive to your question is: Swap the meter base (If supported by the POCO), to a class 320, run your 4/0 and 2/0 to the garage (in conduit of course) to the new 200 amp panel in the garage and you're done. 05 LIGHTING PANEL CIRCUIT BR 127.4 125.7 51 01 CEMENTING EQUIPMENT 124.7. Heat pump, EV charging, arc welder.hmmmm, those aren't light loads. Not only that, you wouldn't have to mess much with the existing setup because all the new stuff will be "before" your outside breaker panel. You'll have 2 "main panels", one in the house, the other in the new garage. Since the new garage is only 30' away, wire cost wouldn't be a major consideration. 200 amp main breaker panel electrical panel main lug/ main lug kit breaker boxes 240 volts breaker boxes outdoor breaker boxes. The POCO is always the long pole in the tent! 200 Amp 16-Circuit Outdoor Main Breaker Plug-On Neutral Load Center with Flush Cover. You'll need to involve the power company to make sure the feed and transformer is up to feeding a class 320 service. ![]() Class 320 meter bases aren't cheap, but since you said you weren't worried about cost, that would give you the most robust solution. That way you can run 2 200 amp panels at full capacity. I realize this doesn't directly answer your question, but I'd consider swapping your meter base to a class 320 service. If you want a copper bus option, the Siemens PNW0816B1200TC is reasonably priced but'd require you to get a different breaker and lug block, while the Square D QO1816M200FTRB is somewhat more expensive, and also requires different parts, but might be easier to mate to the existing conduits. While normally a reasonable choice, your complaints about salt air and aluminum are a problem for this panel, as it has busses made from tinned aluminum. The bad news is that you have a Square D HomeLine panel. The bad news: you might want to rethink your choice of panel For your panel (Square D HomeLine), the correct kit is a HOML2225 this includes both the subfeed lug block itself and a neutral chair lug that adapts your fat 1/0 neutral to the panel's busses. The easiest way to do this is to use a subfeed lug kit to tap the busses on your panel. The good news: the parts you need aren't that bad As a result of that, and the fact that a 2/0 copper wire is rated for 175A (a standard breaker size) at 75☌, you're stuck upsizing this feeder to 3/0 copper hots and a 1/0 neutral, or chasing down a 175A circuit breaker for your panel if you can't enlarge the feeder wires. 200 Amp 30-Space 60-Circuit Indoor Main Breaker Load Center with Cover. ![]() ![]() Since this is a garage you're feeding and not a house, you can't use the "83% rule" (aka Table 310.12 in the current Code), as that rerate only applies to feeders or services serving entire dwelling units. Br Series Outdoor Main Breaker Mobile Home Loadcenter 200 Amps 8 To 16 Circuits. You need 3/0 not 2/0 for running this in copper
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