PAT Testing, or 'Portable Appliance Testing, is the visual inspection and instrument-testing of electrical equipment for safety purposes.
It is Health and Safety Best Practice to have periodic PAT Testing carried out in the workplace, rented accommodation and residential care homes, etc.
It is a legal requirement that electrical equipment in the workplace or that which is supplied by a landlord is 'safe, well-maintained and suitable for the purpose for which it is being used'.
Many performance venues insist on evidence of performer's electrical equipment having been PAT Tested.
Many insurance companies will only provide cover if a company's electrical equipment has been PAT tested.