250.92 (B) allows the raceway to be bonded to the grounded conductor (neutral)
250.142 allows the use of the gounded conductor (neutral) to ground on the supply side of the main disconnect. the connection from the raceway to a neutral is a bonding wire. I think Its ok touse a No. 4 Cu or 2 Al from , say a bonding bushing to the neutral at the pole.
In our area most leave a bonding bushing on the riser and the utility will catch it with their No. 6 that they run to the rod at the base of the pole. No one seems to argue with this. But I think the Code requires a full size bond wire per 250.66 to the neutral.
any way thats how I read it!!