The scope of ISO 23570 is the interconnection of elements in the control system of machine tools and similar large pieces of industrial automation. This specification includes cable types, sizes and sheath colours, connector types and contact assignments, and diagnostic functions appropriate to the sensors and actuators. This part of ISO 23570 covers the interconnection of three-phase auxiliary motors with their power source. NOTE ISO 23570 does not address the design or operation of such equipment with respect to safety issues. Appropriate safety standards should be consulted for such requirements.