How often does PAT testing need to be carried out?

The tests should be performed by a ‘competent’ person using a PAT Tester machine. This should be done at regular
intervals to ensure continual safety. The frequency depends on the type of appliance and
the environment it is used in.

The exact recommendations are published by the Institution of Electrical Engineers (IEE) in their “Code of Practice for In-service Inspection and Testing of Electrical Equipment”. This guide forms the basis for Portable Appliance Testing in the UK.
Please find below the Intervals set in place by the (IEE) Institution of Electrical Engineers.