Pat Testing Regulations
Portable appliance testing (commonly known as "PAT", "PAT Inspection" or "PAT Testing") is a process in the United Kingdom,the Republic of Ireland, New Zealand and Australia by which electrical appliances are routinely checked for safety. The correct term for the whole process is "in-service inspection & testing of electrical equipment".
Similar procedures exist in in other countries, for example, testing of equipment according to BGV A3 in Germany.
Health and safety regulations require that the electrical appliances be safe to prevent harm to the workers. Many types of equipment require testing at regular intervals to ensure continual safety; the interval between tests depending on both the type of appliance and the environment it is used in.