Collect available repair invoices, the previous certificate and a simple list of alterations. Note whether the route was extended, an entrance changed or the energiser replaced. A working display does not show that every part of the perimeter has been examined, while a nuisance alarm alone does not identify which component needs replacing.
For a larger property, describe the electric fence installation in ordinary terms rather than estimating from the land size. Tell us where the fence runs, whether there is more than one system and who can open the relevant areas. State if any electrified fencing is used for animals so its purpose is clear; do not assume all fences on the site form one security installation.