Description: the head of a pump at the point of best efficiency; Name: head at optimum efficiency
Description: Total head developed by the pump at a rate of flow corresponding to the best efficiency; Name: Optimum head
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 of the electric motor