Building with primary service being (5) 350KW gensets parallelled. Gensets feed into MSB which feed transfer switches. Back-up power is 800A utility service.
All gensets are outside the building.
Is there a system bonding jumper required in each genset enclosure? Or is only one system bonding jumper required and can it be made in MSB?
I've been trying to wrap my head around this for a while. 250.30(A)(2) Exception No. 2 Allows for a system bonding jumper to be be at both the source and first disconnecting means if there is not a parallel path for the grounded conductor. However, it's not clear in this case with multiple generators where the system bonding jumper should go.
Thanks
All gensets are outside the building.
Is there a system bonding jumper required in each genset enclosure? Or is only one system bonding jumper required and can it be made in MSB?
I've been trying to wrap my head around this for a while. 250.30(A)(2) Exception No. 2 Allows for a system bonding jumper to be be at both the source and first disconnecting means if there is not a parallel path for the grounded conductor. However, it's not clear in this case with multiple generators where the system bonding jumper should go.
Thanks