Does anyone has any experiences how to select different type of fuse for CB that can help to reduce arc flash current at main service swbd (480V)? Or methods of how to reduce arc flash? Thank you!
It depends on what type of equipment you are dealing with.Does anyone has any experiences how to select different type of fuse for CB that can help to reduce arc flash current at main service swbd (480V)? Or methods of how to reduce arc flash? Thank you!
we had bolt pressure switch with fuse in main switchboard - 480V/3PH, the calculated ncident energy level at this swbd is around 140ca/cm*cm
Part of the problem is that no protective device can protect itself. You need to have some type of coordinated protection upstream from this switchboard and it is unlikely the utility will provide it.we had bolt pressure switch with fuse in main switchboard - 480V/3PH, the calculated ncident energy level at this swbd is around 140ca/cm*cm
Can we leave it alone and still okay with code? Once we want to service the switchboard, ask utility to de-energy power to the swbd?
They usually have a charge to come out and do that, between 200 and 500 dollars. I am assuming that your building some main fuse on the pole. But it's still required to have an Arc Flash Sticker just make the policy not to work on it while the power is on....
then you wont need the equipment.....
Can we leave it alone and still okay with code? Once we want to service the switchboard, ask utility to de-energy power to the swbd?