secondary conductor

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wexley

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what is the minimum size 75 C transformer secondary conductor, not over 3m long for a 480 volt primary to 208 volt secondary transformer supplied by a 200 ampere primary overcurrent device? i am having trouble with the calculation, i do not understand 240.22 help please
 
I would say #8 based on 240.21(C)(2)-{4} ('08 Code)

but I wouldn't take that answer to the bank :)


200 x 480/208 =461/10 = 46
 
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Gus,
With the information given, I believe you have the correct answer, but you do have to make the assumption that the load is 46 amps or less.
 
Don, I was going on his question of minimum, but yes, I agree that answer would definitely be load dependant. In the real world, I have failed to ever question minimum as most installations have "load" as the determining factor, as you kmow.
Truthfully, had he not asked, I would have never thought "minimum". Bad for an inspector, but true.
 
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