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You should be able to just staple the wire up with out issue. 1/2" should be fine if the wire fits and as for the PVC being exposed; that you should check local code but in my mind I would use metal as it will give you more protection against damage (code here states if the wire is under ground no pipe is needed until it pops out). While PVC is sturdy it's still plastic and gets brittle in the cold.
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Rick
93 968 (My summer car),
05 Cayenne S (My winter car),
79 924 (Wife's summer car), 02 C230k (Wife's winter car),
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