Test frequency on new builds will be set by the designer responsible for the fixed wire installation. Thereafter it is specified by the test engineer in line with the following guidelines:
Maximum period 5 years between inspections and testing
Commercial (or change of occupancy)
Restaurants and hotels
Maximum period 3 years between inspections and testing:
Leisure complexes (excl pools)
Agricultural & horticultural
Note that for some special installations (eg swimming pools, petrol stations, caravan parks) the recommended maximum period between inspections and testing is one year. Other regulations may apply such as Local Authority conditions/cinematograph (safety) regulations, etc.