Laser Machine Grounding/Earthing

[Want2build1]

link here => Untitled

it seems it isn't straight forward, so I will do some more research !

I will make an earth point at the work shop and see if there is a PD between the supplied earth, and my local earth.
Obviously, if there is a PD, then a current will flow !

20yrs ago, when I bought my 1st house, the bathroom, when damp, (after a shower etc.) whould have an earthing problem. if you stood at the sink, and touched the tap, you would get a tingling feeling.. I measured the tap voltage at 50v with the damp floor. I contacted the leccy board who told me earthing was the housholders responsibly ! ... so I bonded the pipes and made a ground earth and all was good :)

My current house is 200 yrs old, and TBH I haven't considered the earthing untill now !
It definately hasn't been re-wires for a long time.
I'd have done it myself by now, but 'we' aren't allowed to any more :(
(yes, I'd have read the current regs and done it properly )