More on Generator Bonding

[dbchamblee]

I recently came across an installation of a 100kW, 120/240 Split phase generator that has me scatching my head. There are separate neutral and EGC in each of the two parallel sets run from the ATS to the Genset. There are connected to the same neutral bus on each end of the run. The ATS is 2 pole (neutral is not switched). The generator has a lug on the outside of the frame for a local grounding electrode. The frame is not bonded to the neutral bus in the genset.

Since its not a SDS, I agree the neutral should be "floating" but I think the EGC should be separate from the neutral and should be bonded to the frame at the genset. The genset has no provision for this. All the neutral & EGC lugs are factory installed on the same bus. I contacted the manufacturer and they saw nothing wrong with this installation.

Any thoughts?

 

[zbang]

You're right. If the neutral/grounded conductor is solid, then the N and G leads to the generator should not be connected at the genny. You need to move the EGC from the neutral bar to a proper ground lug. You may need to add one.