DW Hargreaves Electrical Contractors
NICEIC Approved Contractors Since 1976
WP Remix

Frequency of Tests

This table provides guidance on the initial frequency of formal inspections of electrical installations as well as the routine checks. The initial frequencies in the title of the table refers to the time interval between the issuing of the Electrical Installation Certificate on completion of the work and the first inspection

General Installation

Type of Installation Routine Check Maximum Period between Inspections and testing as necessary(note 8) Notes
Domestic accommodation - general - Change of occupancy /10 years
Domestic accommodation - rented houses and flats 1 year Change of occupancy /5 years 1,2,10
Residential (Houses of Multiple Occupation)- halls of residence, nurses accomodation, etc 1 year Change of occupancy /5 years 1,2,10,11
Commercial 1 Year Change of occupancy /5 years 1,2,3,4
Educational Establishments 6 Months 5 years 1,2,6
Industrial 1 Year 3 years 1,2
Offices 1 Year 5 years 1,2
Shops 1 Year 5 years 1,2
Laboratories 1 Year 5 years 1,2

Hospitals and medical clinics

Type of Installation Routine Check Maximum Period between Inspections and testing as necessary(note 8) Notes
Hospitals and medical clinics general area 1 Year 5 years 1,2
Hospitals and medical clinics medical locations 6 months 1 year 9

Buildings Open to the Public

Type of Installation Routine Check Maximum Period between Inspections and testing as necessary Reference - see key below
Cinemas 1 Year 1 to 3 years 2,6
Church Installations 1 Year 5 Years 2
Leisure complexes (ex swimming pool) 1 Year 3 years 1,2,6
Places of public entertainment 1 Year 3 years 1,2,6
Restaurants/hotels 1 Year 5 years 1,2,6
Theatres 1 Year 3 years 2,6,7
Public Houses 1 Year 5 years 1,2,6
Village halls / Community Centres 1 Year 5 years 1,2

Special and Specific Installations (for medical locations see above)

Type of Installation Routine Check Maximum Period between Inspections and testing as necessary Reference - see key below
Agricultural 1 Year 3 Years 1,2
Caravans 1 Year 3 Years 7
Caravan Parks 6 Months 1 Year 1,2,6
Highway power supplies as convenient 6-8 years -
Marinas 4 months 1 Year 1,2
Fish Farms 4 months 1 Year 1,2
Swimming Pools 4 months 1 Year 1,2,6
Emergency Lighting Daily/Monthly 3 Years 2,3,4
Fire Alarms Daily/Weekly 1 Year 2,4,5
Launderettes monthly 1 Year 1,2,6
Petrol Filling 1 Year 1 Year 1,2,6
Construction Site Installations 3 Months 3 Months 1,2
Notes
  1. Particular attention must be taken to comply with SI 2002 No.2665 - Electricity, Safety, Quality and Continuity Regulations 2002 (as amended)
  2. Electricity at Work Regulations 1989, Regulation and Memorandum of Guidance (HRS25) Published by the HSE
  3. See BS 5266: Part 1: 2005 Code of practice for the emergency lighting of premises.
  4. Other intervals are recommended for testing operation of batteries and generators
  5. See BS 5839 - Part 1: 2002 + A2:2008 Fire detection and alarm systems for buildings. Code of practice for design, installation, commissioning and maintenance).
  6. Local Authority Conditions of License
  7. It is recommended that a caravan is inspected and tested every three years, reduced to every year if it is used Frequently (see Regulation 721.514.1 and Fig 721 Instructions for electricity supply)
  8. The person carrying out subsequent inspections may recommend that the interval between future inspections be increased or decreased as a result of findings of their inspection.
  9. Medical locations shall have their isolating transformer equipment inspected and tested for functionality as well as alarms etc; every third year the output leakage current of the IT isolating equipment shall be measured.
  10. The Landlord and Tenant Act 1985 requires that properties under the Act have their services maintained. Periodic inspection and testing is the IET recongnised method of demonstrating this.
  11. The Management of Houses in Multiple Occupation Regulation (England and Wales).
Source - Guidance Note 3 Inspection & Testing - Section 3.7