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