Specification of minimum requirements for the installation, construction, function, documentation and testing of these systems to ensure patient safety. The requirements are included which relate to the source of supply, distribution system, terminal units, warning systems and non- interchangeability between key components and service outlets. The standard applies only for the medical gases oxygen, nitrous oxide, medical air, nitrogen, helium, carbon dioxide, specified mixtures of gases and medical vacuum. The annexes A to H contain recommendations for technological characteristics and system-related function.