200 Amp Underground service feeder from house to detached accessory dwelling unit

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laker4ever

New User
Location
California
Hello all.
I'm building a new detached accessory dwelling unit (guest house) that will have 200A service panel. The main house has currently 200A overhead service but will be upgraded to 400A service feed with new panel with two meters. Each meter 200A disconnect. My question is about sizing the wires/conduit that will go from meter on main house all the way to detached ADU. The distance between them is about 180 ft. Assuming 3% voltage drop seems that I can run individual 3/0 THHN copper for 2 hots and 1 grounding conductor (Neutral) and probably need 4AWG for ECG. For conduit probably use PVC Sch40 2". Will that work? Running individual conductors is the expensive way.
I also read that I can use a triplex aluminum cable that's called USE (250,250 & 3/0 Pratt Triplex Underground Distribution Cable) it is UL 854. And if I understood the spec sheet, it can run in conduit and will be rated 265 Amps at 90°C which is above what I need. Running the triplex is almost 3 times cheaper than copper THHN. Is that correct. Please comment.
 
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