Like e57 said check with the AHJ before you install a hood electrical system.
Last resturant we did the FM required the exhaust fans to stay running, and all electric and gas to shut down including the lights. He also required the fresh or make up air unit to shut down. He also wanted the hoods ansul system to cause an alarm condition in the fire alarm panel
His explanation was that all sources of heat or power were to be off no fresh air in and the smoke to be exhausted. The alarm was to cause the building to be evacuated and the alarm company to call in the fire to the local 911 center.
