Description: Period of time from the commissioning of a plant, part of a plant, a component or a line system; Name: service life
Description: passed time period after comissioning of a system, sub-system, component or piping; Name: Operating time 
Description: Allocation of explosion-protected electrical operating media according to their maximum surface temperature for use in explosion-capable atmosphere in accordance with (IEC 50(426):1990; Name: Explosion protection temperature class of the electric motor