In other words, an active control signal 47 turns on {HEAD ~ an isolation device} to allow {TAIL ~ a potential} to be conducted from one location to another location 
to allow
In other words , an active control signal 47 turns on { HEAD ~ an isolation device } to allow { TAIL ~ a potential } to be conducted from one location to another location
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH