Some years ago, working as an agency spark for a large electrical contracting company on a certain northern airport during a major expansion program, it was necessary to divert all the telemetry cabling between two H.V. substations on part of a H.V. ring as they were laid in ducts crossing an area wanted for development. A couple of new 50 pair cables had been installed skirting the development area and terminated into large J.B.s at either end waiting for the big day of cutting the existing cables glanding them and terminating into the appropriate terminals in the J.B.s. The final changeover was delayed while the airport management hummed and hared over the implications of any problems but eventually reluctantly gave the go ahead for the changeover. After cutting the existing cables and glanding them into the J.B.s, there I was sitting on a box contentedly laid back listening to my favourite radio station, separating out the pairs laying them into finger trunking numbering crimping ferules and connecting into the terminals double checking making sure everything was correct, when suddenly blam, blam, blam, all the air breakers on the H.V. isolators blew out the sub went into darkness and the emergency lighting came on. Next thing the some airport manager came running in to the sub, "what the !***! have you done, you !!!! !!!! you've stopped the whole airport". I was laid off and sent home, it was a couple of hours later listening to the local news I found out a digger driver for the ground workers had had a lucky escape nearly blowing the bucket off his JCB when he'd dug up and damaged one of the H.V. cables in another part of the airport. But poor old sparky had got the blame for it originally without any second thought apologies or reinstatement.