Re: Fire pump service grounding
Thanks for the reply yoopersup.
Let's assume 3pole transfer switch.
My contention is that the fire pump service would be treated like any other service and subject to all the usual rules regarding grounding, bonding, grounding electrode conductor, grounding electrodes, etc.
Let's also assume that the fire pump service from the utility pad mount transformer is separately routed outside the building from the "normal" service and the fire pump service disconnect (combination disconnect/ATS)is 200' from the "normal" service disconnect. Normal service is 2500 amps. Fire pump service is 1/0 CU. Even though the fire pump has no neutral connected load, the grounded conductor must be run from the pad mount transformer to the fire pump service equipment (utility grounds the pad mount transformer).