Portable Appliance Testing (PAT) is a process used in the United Kingdom, Ireland, New Zealand, and Australia to routinely check electrical appliances for safety. It involves a series of visual inspections and electronic tests to ensure that the appliances are safe to use. The process includes a formal visual inspection, followed by electronic testing using specialized equipment. The testing equipment has been specifically developed for PAT inspections, based on the testing equipment used by manufacturers to ensure compliance with relevant standards. PAT testing can be conducted manually using standard test gear, or with an automatic tester that applies a sequence of tests. The process helps to detect potential safety problems with electrical appliances before they occur, reducing the risk of electrical shock. It is not compulsory by law, but it is strongly recommended to ensure the safety of electrical equipment and prevent danger.