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