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Frequency of Inspection and Testing

The frequency of periodic inspection and testing must be determined taking into account:

  1. the type of installation
  2. its use and operation
  3. the frequency and quality of maintenance
  4. the external influences to which it is subjected

The table below provides guidance on the frequency of formal inspections of electrical installations as well as routine checks.

Type of Installation Routine Check Maximum Period between inspections and testing as necessary Reference (see notes below)

General installation

Domestic N/A change of occupancy/10 years N/A
Commercial 1 year
change of occupancy/5 years 1,2
Educational establishments 4 months 5 years 1,2
Hospitals 1 year 5 years 1,2
Industrial 1 year 3 years 1,2
Residential accommodation at change of occupancy/ 1 year 5 years 1
Offices 1 year 5 years 1,2
Shops 1 year 5 years 1,2
Laboratories 1 year 5 years 1,2

Buildings open to the public

Cinemas 4 months 1 year 2,6,7
Church installations 1 year 5 years (quinquenially) 2
Leisure complexes 4 months 1 year 1,2,6
Places of public entertainment 1 year 5 years 1,2,6
Restaurants and hotels 4 months 1 year 1,2,6
Theatres 4 months 1 year 2,6,7
Public houses 1 year 5 years 1,2,6
Village halls/Community centres 1 year 5 years 1,2

External installations

Agricultural and horticultural 1 year 3 years 1,2
Caravans 1 year 3 years N/A
Caravan parks
6 months 1 year 1,2,6
Highway power supplies as convenient 6 years N/A
Marinas 4 months 1 year 1,2
Fish farms 4 months 1 year 1,2
Emergency lighting daily/monthly 3 years 2,3,4
Fire alarms daily/weekly/monthly 1 year 2,4,5
Laundrettes 1 year 1 year 1,2,6
Petrol filling stations 1 year 1 year 1,2,6
Construction site installations 3 months 3 months
1,2
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