My first job was at a studio near a major grid switching station that fed the supergrid in the UK (750kV, or three-quarters of a million volts... :shock: )
They used massive shots of compressed air to "snuff" the inevitable switching arcs... when they broke connections, you knew about it!
All that though, was nothing next to the day that they demolished a load of old tennement blocks nearby in the early 1980's... and got it completely wrong!!! They used a local group of cowboy demolition guys at a cut price, who had seen how the Americans did it on TV and reckoned that they could do the same thing for a lot less money. -The staggered timing never happened and it all went up simultaneously. At the time we were doing a vocal, and in record.
The building we were in was part of the Royal Ordnance Facility build in 1942, with three courses of kiln-hardened brick and a blast-containment wall all round the building. The F*#ing foor shook when this bunch of ******s hit the big red switch, and the vocalist did a quick "duck & cover" crying "WTF!!!"
The demolition site was about 1 mile away across farmland and open fields... but the blast was so big that we felt it... -We kept that take for historical reasons!
Keith