MetalMonkey
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With big steel structure connected to mains via a 13a plug you are rellying on the earth pin an cable, connections etc to protect you in the event of a fault. At least if you have a seperate earth you will allways be safe, relatively. Who knows, an angle grinder cable pinched between two bits of steel, the lift plug not even in, and the whole job could be live?
Agree on sseing many plugs and sockets overheated, but these would be continious loads, like heaters, driers, washing machines. Very different to a lift.
Actually a separate earth bonding of the steel structure could have quite the opposite effect, especially if this is a shed with a likely exported PME.
A lot of lift equipment has pneumatic or low voltage controls operating hydraulics, so there is actually very little risk of electrical shock, in such cases bonding it could make it more dangerous.