Is there a standard certificate I can use to state that a sub circuit supplying a building has been disconnected and the building can be safely demolished. This is not the main supply, the building is fed from supply kiosk remote from the building.

BS 7671 doesn't have a specific certificate - typically you want a "Certificate of Isolation and Disconnection" if the site owner doesn't have his own (or a relevant permit to work system)

Just knock one up on the PC to state where fed from, what was disconnected, what tests you did (and record the instruments), confirm isolated cores to earth, what has happened source end (disconnected or just turned off and locked) , name rank and number, date

Simples

regards

OMS

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Failure is always an option