Feeder Sizing

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horsegoer

Senior Member
Location
NJ
If you have a bus duct switch feeding a panel do you base your feeder size of the switch or the panel? Thanks.
 

shockin

Senior Member
I would base it on the size of fuses inside the switch.

You could have 40 amps fuses / wire feeding a 600 amp panel. Perfectly legal, just seems odd.
 

skeshesh

Senior Member
Location
Los Angeles, Ca
The question if kind of backwards. You size the OCPD to protect your feeder. So you would choose a panel that exceeds your load and accounts for future growth; then the size of the feeder is based on your load calculation x 1.25 and account for voltage drop, derate, etc. ; finally you choose your OCPD to protect your feeder.
What's the actual situation you're dealing with?
 
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