Description: Percentage in a period where the object has fulfilled the function; Name: availability in relation to time
Description: During a given period of time, percentage of the time during which an item was able to perform when required ; Name: Time based availability
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