Hi do you need to isolate the supply to a commercial building to connect a 16mm2 bonding conductor to the MET in relation to BS 7671 or HSE?
It isn't something I can find explicit guidance on.
The MET is at the intake and separate to the main LV board.
It is easily accessible without coming into contact with L&N conductors connected to the main LV board.
The earthing system is either TN-S or TN-C-S.
Isolating the supply is possible if required but would be costly, require multiple companies attending out of hours and would need to be planned in well in advance due to it being a refrigerated / food storage facility.
I note all these reasons are inconvenience related which is secondary to health and safety. Therefore, I'm only asking if there is a method that is commonly used such as standing on rubber mats or wearing rated gloves etc that is considered safe and proportionate to the to the small task being carried out.
Thanks
