If the generator has the neutral bonded to "ground" in the generator and a switched neutral is employed in the transfer switch ( as it should be with a bonded generator neutral), a ground electrode should not be used or needed because the neutral is still bonded to ground through the generator.. Doing anything else may cause circulating currents in the grounding / bonding conductors and will defeat the purpose of the switched neutral in the transfer switch.
So, ... this is based on a single phase generator using a 4 conductor cable(L1, L2, N, & PE) connecting the portable genny to a 3 pole(L1, L2, & N) transfer switch feeding a panel with a combined neutral and ground bar. The generator PE lead will be connected to the building grounding system at the transfer switch. True?
Larry C
