George as I said I like the idea of sizing the wire to the disconnect but don't you think the use of the word "or" in 240.21(B)(1)(1)(b) allows us to size to the fuse?
This all seems pointless when we talk about 40 amp fuses in a 60 amp disconnect. 6 or 8 AWG is almost no cost difference, but change the load to 410 amps, you would need a 600 amp disconnect switch, the cost of providing 600 amps to the switch instead of 410 amps will be significant.
Is it your interpretation that the tap conductors to a 600 amp fused disconnect would need to be say 2 sets of 350s (620 Amps) instead of one set of 600s (420 Amps)?
I do not agree, IMO the use of "or" in 240.21(B)(1)(1)(b) allows us to size to fuse or breaker ratings.
If the NFPA meant it only to apply to breakers I feel they would have used the word 'breaker' in place of 'overcurrent protective device' in 240.21(B)(1)(1)(b).
JMO and I am interested in other peoples opinions too.
Bob
[This message has been edited by iwire (edited 05-30-2004).]
