IEC 60950 was the safety standard for information technology equipment, including business machines, data processing equipment, telecom terminal equipment and their accessories. It addressed electric shock, energy hazards, fire, mechanical and thermal injury, and radiation, and it defined the protective measures that a product must apply according to the accessibility of its parts, the voltage present and the amount of stored energy. Constructional requirements covered insulation, clearances, creepage distances, wiring, printed boards, enclosures and protective earthing, while the type-test programme included dielectric strength, insulation resistance, leakage current, temperature rise, ball pressure, glow-wire and abnormal-operation testing in which components and circuits are deliberately faulted. The standard has now been withdrawn and its scope transferred to IEC 62368-1, which replaces the prescriptive constructional rules with a hazard-based safety engineering model. Certification certificates issued against IEC 60950 remain valid only while the original approval scheme permits, so products still on the market frequently carry markings to this earlier edition alongside the newer one.