Guidelines on Frequency of Periodic Fixed Wire Testing & Inspection

The following table gives guidance on how often an Electrical Installation should have a Test & Inspection carried out.

The contents are industry recommendations and are based upon a number of different factors such as…

  • The premises usage.
  • The installations age and its subsequent wear and tear.
  • The type of installation.
  • The standard and frequency of maintenance carried out on the installation.
  • The environment the installation resides in.


General Installations


Buildings Open To The Public


External Installations

Reference Key

  1. Particular attention must be taken to comply with S1 1988 No 1057 – Electricity, Safety, Quality and Continuity Regulations 2002 (as amended).
  2. S1 1989 No 635 – Electricity at Work Regulations 1989 (Regulations 4 & Memorandum).
  3. See BS5266: Part 1 : 2005 Code of practice for the emergency lighting of premises other than cinemas and certain other specific premises used for entertertainment.
  4. Other intervals are recommended for testing operation of batteries and generators.
  5. See BS 5839: Part 1: 2002 Code of practice for system design installation and servicing (Fire detection and alarms systems for buildings).
  6. Local Authority Conditions of Licence.
  7. S1 1995 No 1129 (Clause 27) – Cinematography (Safety) Regulations.
  8. It is recommended that a caravan is inspected and tested annually if it is used frequently.

(Information taken from IEE guidance note 3)