Testing Intervals

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

  • the type of installation
  • its use and operation
  • the frequency and quality of maintenance
  • 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. (Table extracted from BS7671 IET Wiring Regulations 18th Edition: 2018).

Type of InstallationRoutine checkMaximum period between
inspections and testing
as necessary

General Installation

Domestic accommodation –
Domestic accmomdation –
rented houses and flats

1 year
change of occupancy/10 years
change of occupancy/5 years
Residential accommodation (Houses of
Multiple Occupation) – halls of residence,
nurses accommodation, etc.
1 yearchange of occupancy/5 years
Educational establishments6 months5 years
Industrial1 year3 years
Commercial1 yearChange of occupancy/5 years
Offices1 year5 years
Shops1 year5 years
Laboratories1 year5 years

Hospitals and Clinics

Hospitals and medical clinics –
general areas
Hospitals and medical clinics –
medical locations
1 year

6 months
5 years

1 year

Buildings open to the public

Cinemas1 year1-3 years
Church installations1 year5 years
Leisure complexes
(excluding swimming pools)
1 year3 years
Places of public entertainment1 year3 years
Restaurants and hotels1 year5 years
Theatres1 year3 years
Public houses1 year5 years
Village halls/Community centres1 year5 years

Special and specific installations
(for medical locations see above)

Agricultural and horticultural1 year3 years
Swimming pools4 months1 year
Caravan parks
1 year
6 months
3 years
1 year
Highway power suppliesas convenient6-8 years
Marinas4 months1 year
Fish farms4 months1 year
Emergency lightingdaily/monthly3 years
Fire alarmsdaily/weekly1 year
Launderettesmonthly1 year
Petrol filling stations1 year1 year
Construction site installations3 months3 months

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Fixed Wire Testing (EICR)

Obtain an EICR to confirm compliance of electrical circuits and installations with current safety regulations.

Fixed Wire Testing: Observation Codes Explained

Fixed Wire Testing: Observation Codes Explained

How Often Should Fixed Wire Testing Be Carried Out

The recommended frequency of Fixed Wire Testing varies between 1 and 5 years depending upon the business type, so how often do you need to t