Exciter bearings that make a connection to the alternator outboard bearing pedestal must also be insulated. No such requirement exists for lube oil piping connections.

BOTH lube oil piping connections AND exciter bearings that make a connection to the alternator outboard bearing pedestal must also be insulated.

The lube oil piping connections that make a connection to the alternator outboard bearing pedestal must also be insulated. No such requirement exists for exciter bearings.

BOTH lube oil piping connections AND exciter bearings that make a connection to the alternator inboard bearing pedestal must also be insulated.