ECN Forum Forums General Topics of the Trade General Discussion Area bonding electrodes, separate buildings(common area circuits

given: 2 separate buildings , by use of a firewall, each building as its own service. ( common area branch circuits suppiled from one of the services is used to supply secuity lighting for both buildings) Should the electrodes from each service be bonded together to stablize any difference in potential ? What code section requires the electrode to be bonded in this case ?