[M0FYA Andy]

I suggest that the episode where the item under repair apparently plunged the entire building into darkness whilst the camera happened to be running was a rather childish fabrication.
Nobody would wire a repair workshop such that a short-circuit on one bench would trip the entire building's supply including the lighting.

Having apparently caused this dramatic failure, the repairer/duffer then struggled against all the odds to isolate the problem, but strangely the reason wasn't then explained! Total tosh which really put me off the programme.

Andy