The amount of current shunted is determined by {HEAD ~ the highest voltage level} of {TAIL ~ the control buses} 30a a 
of
The amount of current shunted is determined by { HEAD ~ the highest voltage level } of { TAIL ~ the control buses } 30a a
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH