Description: Period of time during which an item performs its intended function, it includes all the time a machine is continuously running from start-up until it is shut down.; Name: ot
Description: passed time period after comissioning of a system, sub-system, component or piping; Name: Operating time 
Description: Classification of electrical and not electrical operating supplies according to the explosion capable atmosphere in which they are provided for use; Name: Explosion protection-device group of the complete device