I had a real rollocking off a business owner asking why i had turned all power of in the building without permission . She would not believe that it was coincidence an electrician was in the building during a power cut .
C2 for me . Im not having my name on a condition report where someone can screw into a lone live conductor with no additional protection on an installation that requires additional protection on all cables buried at a a depth less that 50mm .
I find the hammer action on all sds drills to be very aggressive and only suitable to new/solid brick and blockwork . If you have to drill into old material that has a tendency to fall apart use your combi drill on hammer action .
Test to see whether the steel structure requires bonding . If it is introducing an earth potential and requires bonding test whether each section requires linking .
Quite simple really .
A few scenarios
There is possibly an isolator switch turned off which could be found by ringing the installer (details on test certificate)
Maybe the property sale required testing after you viewed the lights working . A 500 volt IR test could have damaged the internal components .
Both...
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