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