Protection against electric shock - common aspects for installations and equipment, including equipment protection classes.
A basic safety publication (IEC Guide 104) establishing principles for protection of persons and animals against electric shock, common to installations and equipment, without voltage or current limits, for frequencies up to 1000 Hz.
It gives coordination requirements between different systems and equipment, including classification of equipment by protection class. It is a standard for technical committees - product standards translate its principles into detailed requirements.
A reference to EN 61140 in a transducer data sheet allows the protection class and method of basic/fault protection to be identified, making it easier to design protective connections in a cabinet.
