Minor works certificate - Ze Test

[tomodo]

Hi on the minor works certificate it asks for Ze, so any time i install an addition to a circuit lets say, i then have to isolate the whole system disconnect the main earth and test each time? Is there anything that permits the test be completed without having to disconnect main earth? Thanks

 

[newfutile]

You could measure it as ZDB and make a note that it has been measured that way

 

[cliffed]

Ze on a MWC not seen that

 

[bill01803]

On the minor works in the brown book it has Zdb