Similar multiphase meters apply the fundamental frequency filtering means to {HEAD ~ each load current} and optionally to each supply voltage to extend the method used in {TAIL ~ single phase meters} 
Similar multiphase meters apply the fundamental frequency filtering means to { HEAD ~ each load current } and optionally to each supply voltage to extend the method used in { TAIL ~ single phase meters }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL