We are installing two 250 V 400 A rated battery banks that will supply power to circuit breakers and other control circuits. I need to know if NEC 70A article 250.160 and 250.162 will control this, or if they do not apply. There is a battery charger (AC to DC) connected to each bank, but it does not power the system. It merely charges the batteries. I'm told it qualifies as a "product". The batteries supply the system. I interpret 250.162 as meaning these battery banks need to be grounded. Mark Cloutier of the NFPA just agreed on the phone. I need it in writing from the NFPA. I just joined, so use my e-mail on the record to respond.