Bill,
It is a violation of 250-142(b) to use a 2 pole transfer switch on a 120/240 volt system and have the grounded conductor bonded to the generator frame. The bonding will still exist in a correctly connected system, but the path is longer. If you are using a 2 pole transfer switch, the neutral must be kept isolated from the grounding conductors and an equipment grounding conductor must be run to the generator frame. The bonding path is from the generator neutral to the house neutral to the house main bonding jumper and back to the generator via the equipment grounding conductors.
I also don't understand how bonding will make any difference in any voltage fluctuations.
Don(resqcapt19)
