Fuse and wire size question.

[bassil]

I have this situation:

5 sets of 3-500 MCM RHW + 1-2/o in duct bank comming from a PSE&G transformer to a switch gear with main fuses size 1350Amps.

I determined the the ampacity of the wires as follows:
380A x 3 = 1140 amps.

Can some one tell me why a 1350amp fuse is used?

Thank you very much...
Bassil

 

[charlie b]

Re: Fuse and wire size question.

I would like to close this, as it relates closely to another topic in the engineering area. Please add responses to that other topic.