150ft sub panel

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What wire and thickness is recommended for 150 ft @ 60-70amps (2 hot, 1 neutral, 1 ground) to the main 200a panel? Running across my attic, down wall, underground.

Which type of wire? Copper SER? 4-4-4-6?
Would that be best be run in conduit for entire length? Across garage, into main attic, down exterior wall, underground.

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    2020-12-27T16:34:03-05:00

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    Which type of wire? Copper SER? 4-4-4-6?
    Would that be best be run in conduit for entire length? Across garage, into main attic, down exterior wall, underground.

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    I would have to say a #4 wire. However, it will have to go in a conduit while underground.

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