Chassis ground for 110V AC equipment?

[duetto]

Hello, My boat has a MarineAir Air Con and Torrid hot water heater. Both are 110V AC. The previous owner had put a ground wire from the chassis of each unit to the nearest bronze seacock. Is this ground wire necessary? Note: My bronze seacocks are not bonded together or to anything else. Thanks for your input.

[team karst]

Insure those appliances are bonded to the AC supply from the frames, and remove the bootleg ground to the TH. These must have a 3 wire ac cable.

[CharlieJ]

To clarify: The safety ground (green) wire is required to be run back to the safety ground bus, usually at the main panel board.

[duetto]

Thank you for the responses. I have confirmed proper 3-wire AC wiring and I have removed the previous owners additional wire to the seacock.