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On the subject of pulling the DNO fuse.

alanblaby
There have been a couple of reports here of the DNO confronting electricians who have pulled their fuse.


It's getting closer to home, a work colleague was doing a CU change on a domestic house last week, no isolator fitted, so he pulled the fuse (no seals present).

South Nottinghamshire.


Around 90 minutes later there was a knock on the door, a guy from Western Power was investigating a power loss at the property, reported by the Smart Meter phoning home.

He gave the sparky a talking to, and warned they are getting strict in pursuing people who do it, he said meter fiddling was rife, so any loss of power is checked out asap.
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    Have you ever seen a faulty cutout “let go” whilst being fairly near it? It is incredibly frightening, and surprising how long it will burn for, throwing molten metal at anyone in range. An electrical arc flash has a temperature hotter than the surface of the sun, and an explosive force of several sticks of dynamite. You really don’t want to discover it in the cupboard under the stairs, or anywhere else for that matter. . . 



    It's not my field but I was told by a lecturer on protection course last year that DNO disconnection times are rather longer than BS7671 and indeed the design of some LV distribution systems is intended to have the cable burn back within the insulation/sheath and extinguish itself before the substation fuse operates, meaning other customers remain connected. Which is fine buried underground well away from people, but means the risk assessment for a live cutout in a building is a bit different to pulling a fuse in "normal circumstances"
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    Have you ever seen a faulty cutout “let go” whilst being fairly near it? It is incredibly frightening, and surprising how long it will burn for, throwing molten metal at anyone in range. An electrical arc flash has a temperature hotter than the surface of the sun, and an explosive force of several sticks of dynamite. You really don’t want to discover it in the cupboard under the stairs, or anywhere else for that matter. . . 



    It's not my field but I was told by a lecturer on protection course last year that DNO disconnection times are rather longer than BS7671 and indeed the design of some LV distribution systems is intended to have the cable burn back within the insulation/sheath and extinguish itself before the substation fuse operates, meaning other customers remain connected. Which is fine buried underground well away from people, but means the risk assessment for a live cutout in a building is a bit different to pulling a fuse in "normal circumstances"
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