Posted by JMOR on December 01, 2011 at 16:21:56 from (72.190.9.193):
In Reply to: Bury the Wires? posted by Allan In NE on December 01, 2011 at 12:55:17:
Quoting Removed, click Modern View to seeDo you know why they de-rate for buried wires vs free air? I believe it is due to heat & inability to cool as well when buried, so de-rate to save the insulation from over temp. That would actually mean that when carrying the de-rated currents there are fewer watts lost and actually more 'efficient', but carrying less current. To gain that current carrying capacity back, then you use larger conductors......less loss than in free air for same current (more efficient), but certainly more costly.
As for cost, I priced 1200 foot run to my house & underground was 5X the cost of overhead in 1997. That underground run would have been at 7,200v and I expect the 5X ratio to be greater with 250,000 or 500,000 type transmission voltages.
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