Diode protection 512, e.g., {HEAD ~ crossed diodes} connected in {TAIL ~ parallel} with one another and with a resistor element may be connected across pairs of conductors in each circuit 
connected in
Diode protection 512 , e.g. , { HEAD ~ crossed diodes } connected in { TAIL ~ parallel } with one another and with a resistor element may be connected across pairs of conductors in each circuit
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH