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: The EU directive 2014/34 (ATEX) classifies explosion-proof devices into categories in Europe. At the international level, there was introduced the EPL (Equipment Protection Level); Name: Explosion protection Equipment Protection Level (EPL) of the electric motor