Description: Design of the object at a certain frequency, which is repeated regularly; Name: nominal frequency
Description: Clarification of the object to a certain frequency which repeats itself regularly; Name: Nominal frequency
Description: norm/stipulation describing the explosion protection. The explosion protection type, the device category, the temperature class as well as the device / explosion group are taken from this norm. The type and number of the norm/stipulation with issue year and issue month must be given; Name: Reference norm of the explosion protection