What is inspection and testing?
The aim of the inspection and testing process is to establish the safety and correct functioning of the electrical installation, without posing a danger to the inspector or other persons and without damaging the electrical installation under test. Only when the installation successfully passes one stage within the process, is it then safe to proceed to the next step. It is essential that inspection and testing are carried out throughout the installation process and on completion. There are two main types of inspection and testing referred to in the IET Wiring Regulations. The first is initial verification, the inspection and testing of new installations, alterations or additions. The second is periodic inspection, performed on existing installations. A new electrical installation, prior to initial verification, has never been connected to its supply or performed its intended function before. As electrical installations age, some damage or deterioration is inevitable.