Is it feasible to ground the lighting switches and explosion-proof sockets in the explosion-proof area using jumper wires?
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As the title suggests, do lighting switches, control buttons, explosion-proof sockets, etc., in explosion-proof areas require dedicated grounding wires to be connected to the grounding main lines in those areas? Is it feasible to connect using a jumper wire to the metal tube?
No, that would mean connecting the devices in series
The method you described is equivalent to having a ground wire connected in series, which is not allowed!
Connecting explosion-proof switches, sockets, and wiring steel pipes together does not constitute a series connection of grounding wires, right? Is it necessary to ground each explosion-proof switch and socket separately? Connected to the ground main separately?
When there are many devices that need to be grounded, a grounding busbar is usually installed; grounding wires are then drawn from this busbar to connect to the equipment enclosures
The question now is whether explosion-proof lighting switches, explosion-proof sockets, explosion-proof button boxes, etc., in explosion-proof areas need to be grounded separately That is, separate grounding wires are led from the grounding busbar to the explosion-proof lighting switches, explosion-proof sockets, and explosion-proof button boxes.
At many project sites, explosion-proof lighting switches, explosion-proof sockets, explosion-proof button boxes, etc., are not connected to the grounding busbar via separate grounding wires; instead, the explosion-proof lighting switches, explosion-proof sockets, explosion-proof button boxes, etc. are simply bridged together with the wiring steel pipes.
Electrical connection or a semi-connected state with a grounded component should be possible.