- Reaction score
- 10,208
Two points to mention here, as its a removable gland plate then the integrity of the earthing relies on the self tapping screws holding the plate down to the panel (although in your example there are fly tail already connected that may give a better route to earth), had it been a solid construct panel and adequate measures had been taken to give good contact like serrated washers then it may have been acceptable, (not the case in the example pictures). My second point is regarding taking earth loop readings, you are sending a low DC current through this quesstionable connection, this will show you a given reading that the earth path exists or not but it cannot be relied on totally to make a judgement call, normally in fault <1000 amps will flow and if it passes through a weak spot as above could be then that can create high resistance or breakdown which may cause the OCPD to operate out of permitted trip times, this could lead to damage to the cabling of the circuit and the integrity of isulation.
These boards probably just require a serrated washer on the inside and a common fly lead looped to the bonding terminal, I see no reason to power down and stop production as these boards are designed with finger protection and isolated stubbs, so unless you have other reasons to need to power down the full board then I cannot see why a professional who is aware of the dangers within this board cannot leave them energised while the work is done, this is where the stupidity of H&S red tape tramples on common sense and actual risk, use a risk assessment and if you don't see any immediate concern like exposed or damaged conductors that would increase the risk then just plan it as a routine job.
These boards probably just require a serrated washer on the inside and a common fly lead looped to the bonding terminal, I see no reason to power down and stop production as these boards are designed with finger protection and isolated stubbs, so unless you have other reasons to need to power down the full board then I cannot see why a professional who is aware of the dangers within this board cannot leave them energised while the work is done, this is where the stupidity of H&S red tape tramples on common sense and actual risk, use a risk assessment and if you don't see any immediate concern like exposed or damaged conductors that would increase the risk then just plan it as a routine job.