In a new build there should be an installation certificate near the consumer unit that specifies the tested values for zs and confirms ir tests, sockets in a new build should have been tested as part of the installation process to ensure they are phase correct etc.
That does apply to any new installation not just new builds.
In a new build there should be an installation certificate near the consumer unit that specifies the tested values for zs and confirms ir tests, sockets in a new build should have been tested as part of the installation process to ensure they are phase correct etc.
That does apply to any new installation not just new builds.
It might look a bit like this :-
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