I have a 3 Phase 208V/2500A Rated Main Switchboard and need to tap the lines to run a new 200A feeder. This has been approved, the service can handle the additional load without a problem. My question is...what size does the fuse protection have to be in this case? I have been told that it has to be 10% of the rating of the switchboard (which would be 250A) with wires sized accordingly. However the person telling me this has been wrong before.
Do the fuses have to be 250A or can they be 200A, with wires sized accordingly?
Do the fuses have to be 250A or can they be 200A, with wires sized accordingly?
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