6.1 All elements of the system should be visually
examined and checked at least once per week, and a record thereof
should be kept. All missing, damaged or inoperable elements should
be replaced.
6.2 All systems should have their signal tested
at least once every five years. Readings should be taken on site.
Should any reading be found to be outside manufacturer's tolerances,
then that element of the system should be replaced.