2000A dual feed grounding

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sparkyz

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Hello everyone I've learned alot from this website but this is my first post here. I have a 2000a SE rated Cummins parallel transfer switch. First time installing one with GFP and not sure about the correct placement of my MBJ and SBJ or a single grounding point on this application. I haven't actually seen engineer or manufacturer specs. Code tells me MBJ line side of ATS but not sure where the best place for SBJ is on this setup.
 
Are the sources 3ph, 4W? Is the switch 3 pole or 4? Where is the GFP CT's being placed? Do you intend for both sources to be seperatly derived? Are both sources utility or is one generator?
 
ron said:
Are the sources 3ph, 4W? Is the switch 3 pole or 4? Where is the GFP CT's being placed? Do you intend for both sources to be seperatly derived? Are both sources utility or is one generator?
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3 phase 4 wire grounded, the SE will be the 4 pole ATS, 2000A utility and SDS genset. Not sure about placement of ct's yet.
 
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Wouldn't it make sense to put both bonding jumpers in the ATS and leave grounded conductor isolated at generator since ATS is first means of disconnect for both services?
 
Wouldn't it make sense to put both bonding jumpers in the ATS and leave grounded conductor isolated at generator since ATS is first means of disconnect for both services?
 
sparkyz said:
Wouldn't it make sense to put both bonding jumpers in the ATS and leave grounded conductor isolated at generator since ATS is first means of disconnect for both services?
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First, they are not both "services". Only utility power can supply a "service".

MBJ is required at Service Disconnecting Means [250.24(B)].

If your SDS gennie has an integral OCPD, you have to install the SBJ at the gennie [250.30(A)(1)]. If ATS truly is the gennie system's first disconnecting means, only then could you install the SBJ at the ATS.
 
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