When installing IAC cable in cable tray [parallel runs each with a ground conductor in the IAC], is the grounding jumper installed on the cable tray considered a "supplemental ground"? Because the IAC cables carry in each a ground conductor, so the tray would just have to be bonded togerther but what size bonding would you use? Would you have to size it based on the OCPD even though each of the IAC's has a continuous ground or would a supplemental ground size be all that is required?