breaker size for sub panel

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tmason

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i have a sub panel square d homeline 100 amp if i run number 4 thhn wire rated at 90 c what size breaker would i need
 
tmason said:
i have a sub panel square d homeline 100 amp if i run number 4 thhn wire rated at 90 c what size breaker would i need
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Assuming this is not nm cable or se cable and the feeder does not carry the entire load of the dwelling- if it is a dwelling then I would say 90 amps if the calculated load is 85 amps or less. 240.4(B)
 
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