there are sparks or people who have near misses every day ,its just a fuse
i replace fuses every day sometimes under load, most times off load most fuses blow due to a fault condition there is not one here just a polarity reversal
iv`e been involved in cu changes for councils and we always pulled our own fuses iv`e also had my apprentice wire from the meter to cu exactly the same way as this resulting in the smoke detector blowing up but you learn to get on with it
you cant isolate a customers premises then wait for dno to come out
your a spark get on with it