Copy of a reply from NSI when I questioned certain lack of testing etc in a previous employ.
Where an alarm company installs a fused spur, it is important that the electrical safety of the fused spur and the fixed electrical installation supplying the fused spur should have been checked. Thus, the alarm company should carry out the appropriate BS 7671 inspection and tests on the electrical installation of the building.
These electrical safety checks include inspecting and testing the main earthing arrangements at the main distribution board of the building, including the main equipotential earth bonding arrangements, inspecting and testing the means for automatic disconnection of supply (fusing or circuit breakers), etc, as well as checking earth loop impedance, and polarity at the fused spur point. (Please note that I am not intending here to give a full list of the inspection and testing needed; simply to say that it will need to include these matters, among other matters).
I would suggest that some of the inspections and tests on the electrical installation of the building may be best done before the fused spur is installed, in case there are electrical safety issues to resolve within the building. It is of course necessary to carry out all the necessary electrical safety checks after the fused spur has been installed. Records of these checks would need to be kept and a minor works certificate would need to be issued.
Please note that electrical work in dwellings now falls within the scope of Part P of the Building Regulations under which certain work must legally be notified to the relevant local authority. For example, this would apply if the fused spur is being run from a separate way (i.e. as a new circuit) from the distribution board.
Yours sincerely
Tony Weeks
Technical Manager