wire size for a 220/380v 3p 4w 50Hz panel

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You have not given enough information for an answer to your question.

Roger
 
roger said:
You have not given enough information for an answer to your question.

Roger
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thanks for answering back there are 4 simular panels that are being fed from 3 #6 wires from the main these panels are used for testing equipment as related to there industry anyway they are fed from the main with a 3pole 60a breaker and have been running fine i just need to know is this normal and can i run thesame wire or should i upsize to #4 the length is 200ft away from main THANKS FOR YOUR HELP
 
You will need to know what the loads will be on the new panel before the conductors and OCP can be sized.

Roger
 
If the loads are less than 60 amps (which appears to be likely, given your description of a 60 amp feeder breaker), and if you are using a wire with a rating of 75C or higher (which we don't know, because you didn't tell us what wire you planned to use), then a #6 has sufficient ampacity to handle the load. For a 200 foot run, I calculated a voltage drop of just under 3 per cent. That is right at the edge of what good design practice would consider acceptable.

So this is a design choice on your part. Do you consider "just good enough" to be good enough for your application? Is this equipment really going to run at full load very often? Would it be a problem for your equipment if it only received 97% of rated voltage? Is the usual voltage value seen at this site generally low to begin with, so that an additional 3% VD would be too much?

Welcome to the forum.
 
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