Profile: Tech Test UK specializes in offering PAT testing and fixed electrical wire testing. Fixed installation testing involves testing the electrical systems that conduct electricity around a building. Anything electrical in a building that is fixed such as lighting, socket outlets, air conditioning and fixed machinery needs to be tested. A portable electrical appliance is an item of electrical equipment which is not part of a fixed installation, and requires a plug attachment to connect to the electrical supply. This includes electric drills, kettles, PCs, printers, monitors, extension cables, and even larger items; for example, vending machines & dish washers.