Board change

 in larger installations that would be impractical so you would almost certainly look for ways to limit the testing beyond what had been worked on

I agree Andy, but this should be accounted for at the initial pricing of the job and finding either a way to do this in a practical way, either at night or out of hours. The power has to go off anyway for the board to be changed over - I was preparing the bid for a few board changes at a hospital and it became rather complicated and we decided that it'd be wise to start testing things before we rip out the old board and replace with RCBO's so we could find the problems easier to start with and know what we were dealing with and not have to have the power off for longer than necessary. Anything that can't be tested after the installation of the new board should be noted down as a limitation with the details of said limitation recorded on a separate sheet.

For domestic situations, I'd recommend testing the entire thing as there shouldn't be anything stopping you from doing so. I wouldn't class it as a "new" installation for the entire thing, but under the "Description and extent of the installation" I'd definitely mention that the circuits tested are existing and that the only change is the new board, breakers and characteristics surrounding it.


- S

 in larger installations that would be impractical so you would almost certainly look for ways to limit the testing beyond what had been worked on

I agree Andy, but this should be accounted for at the initial pricing of the job and finding either a way to do this in a practical way, either at night or out of hours. The power has to go off anyway for the board to be changed over - I was preparing the bid for a few board changes at a hospital and it became rather complicated and we decided that it'd be wise to start testing things before we rip out the old board and replace with RCBO's so we could find the problems easier to start with and know what we were dealing with and not have to have the power off for longer than necessary. Anything that can't be tested after the installation of the new board should be noted down as a limitation with the details of said limitation recorded on a separate sheet.

For domestic situations, I'd recommend testing the entire thing as there shouldn't be anything stopping you from doing so. I wouldn't class it as a "new" installation for the entire thing, but under the "Description and extent of the installation" I'd definitely mention that the circuits tested are existing and that the only change is the new board, breakers and characteristics surrounding it.


- S