IEC 60601-1:1988, Clause 1, applies, except as follows:Amendment (add at the end of 1.1):This International Standard includes requirements for the basic safety and essential performance ofhumidification systems, as defined in 3.6. This International Standard also includes requirements forindividual devices specified for use in humidification systems such as heated breathing tubes (heated-wire breathing tubes) and devices intended to control these heated breathing tubes (heated breathing tube controllers). ISO 5367 specifies other safety and performance requirements for breathing tubes.NOTE Heated breathing tubes are medical electrical equipment and are subj