BoilerBB
Member
- Location
- United States
- Occupation
- Engineer
I am designing a piece of industrial equipment. It is essentially a series of valves and sensors housed in several enclosures. Input power is 115/120VAC. Maximum estimated current is 1.6A. The main electrical disconnect box of the enclosed system is protected by a 6A fuse.
Each valve has its own green ground wire. These ground wires are routed to a single block. A grounding wire from this block is wired to the disconnect switch ground bar, where the line power is grounded.
The broad question is what are the bonding requirements for the smaller enclosures, chassis, and metal panels within the larger enclosure? Does each metal part need its own designated bond wire? Or do the mechanical fasteners (mounting studs, machine screws, and machine screw locknuts) count as electrical bonding? Adding a designated bond wire seems like overkill with the quantity of individual brackets and the fact that the resistance between any non-current carrying metal object in the system and the disconnect switch ground is <1 ohm.
Thank you ahead of time for any input!
Each valve has its own green ground wire. These ground wires are routed to a single block. A grounding wire from this block is wired to the disconnect switch ground bar, where the line power is grounded.
The broad question is what are the bonding requirements for the smaller enclosures, chassis, and metal panels within the larger enclosure? Does each metal part need its own designated bond wire? Or do the mechanical fasteners (mounting studs, machine screws, and machine screw locknuts) count as electrical bonding? Adding a designated bond wire seems like overkill with the quantity of individual brackets and the fact that the resistance between any non-current carrying metal object in the system and the disconnect switch ground is <1 ohm.
Thank you ahead of time for any input!