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overhead conductors used for 400/230 V circuits

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magoo2

Electrical
May 17, 2006
857
What size conductors would one use for the secondary mains on a 400/230 V system? The three-phase supply transformer is 315 kVA. The application is for a western African country.
 
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I'd probably use something like 477 Al. This is my initial cut at it based on ultimate full load of 455 amps. I still have to look at the voltage profile and circuit lengths to see if that's OK.

What I meant to say was what are the standard metric sizes in mm-squared that are used in this area? Or could you point me to a conversion table from AWG to metric.
 
Look at table 8 in the back of the NEC, it gives mm2 values for all the common AWG sizes. What might be available could be an entirely different matter.
 
If you are sizing your equipment for 477 amps you would need a 600 amp service. The rating for 350 cu is 310 amps. A parallel service of 2 #350's = 620 amps. The rating for 500 kcm AL is 310 amps. Two per phase = 620 amps.
 
I just realized you post was for Overhead Conductors. I found information at this site
I think you may have some problems due to the weight of the cable.
2/0 4C 649 lbs/1000ft 210 amps
3/0 4C 801 lbs/1000ft 240 amps
4/0 4C 991 lbs/1000ft 280 amps
336 4C 1591 lbs/1000ft 330 amps

If your load is 455 amps, you would require 2 - 3/0 cables.
What is the estimated distance for the installation?
 
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