Proving unit

[SPECIAL LOCATION]

If you are at the point of isolation there's bound to be something live going to the means of isolation! In a domestic setting, as I suggested above, turn off main switch on CU the incoming tails are live.If in a factory it's a single isolator for a motor there will be a live going in and a dead cable coming out. Other than in the even of total power loss would this not be the case, and then care must be used as installation could become live whilst you work on it!

Within a domestic environment using the incoming supply tails where they terminate onto the main switch is considered an acceptable method of proving your voltage tester is still working... well it is by one of the main Part P scheme providers !

and they have been happy with this method during my assessments.B-)

Obviously as has been pointed out..

within a commercial / industrial situation..

it may be much harder to have a local "know live source"..

which is where a proving unit is a more useful item.

 

[steptoe]

Hey Mr Steptoe thought you might like a new hat.

you dont even wanna go there!!!!

Aggie refuses to acknowledge my existence sometimes when I wear some of them,, :^O :^O:^O

the nag looks a bit fitter than hercules tho, might have to trade him in.