| Power requirment When performing calculations it is important to bear in mind the overall power requirement. All energy consumers that belong to machines, should be observed, for example, intake filters, fans and pumps. With comparisons between different investment options particular importance must be placed on the use of comparable values. Therefore you must be assured that the values are stated in accordance with internationally agreed regulations, for example, as set out in ISO 1217. Ed3, supplement C-1996.