IEC 60950-1 contained the general safety requirements for information technology equipment and was for many years the standard against which computers, servers, printers, network equipment and telecom terminals were certified worldwide. It set out the classification of equipment by protection class and by the type of power source, then specified the requirements for protection against electric shock, including insulation levels, touch current limits, protective earthing and the separation of hazardous from accessible circuits. It also covered energy hazards from high-current low-voltage sources, fire containment through material and enclosure requirements, and the thermal, mechanical and radiation hazards associated with the product. A comprehensive series of type tests was defined: dielectric strength, insulation resistance, touch current, temperature rise, limited power source verification, capacitor discharge and a set of abnormal-condition tests. Component and subassembly requirements were included through a long set of annexes. Like IEC 60950 it has been withdrawn and replaced by IEC 62368-1, although a large installed base of certificates remains in force.