Ground monitor circuit protection apparatus

A circuit protection apparatus comprising:

• a substrate;
• a resistor assembly mounted on the substrate and connected between a first terminal and a second terminal, the resistor assembly comprising a plurality of resistors connected in series between the first terminal and the second terminal, the resistor assembly connected in one or more of a pilot conductor and a ground return of a ground monitor, the pilot conductor injecting a current signal in a grounding conductor of a power cable assembly, the resistor assembly rated to at least 600 watts (“W”), wherein each resistors of the plurality of resistors is rated at least 600 W divided by the number of resistors in the plurality of resistors, wherein each resistor has a rated resistance that is the same as each of the other resistors in the plurality of resistors;
• and
• a zener diode assembly mounted on the substrate and connected between a zener connection point and the ground return of the ground monitor, the zener connection point comprising one of the first terminal and the second terminal, the zener diode assembly comprising a plurality of zener diodes connected in series between the zener connection point and the ground return, the zener diode assembly sized to clamp a voltage from the zener connection point to the ground return to a value of less than or equal to a zener threshold voltage, the zener threshold voltage set above a nominal voltage on the pilot conductor,
• wherein the plurality of resistors, the plurality of zener diodes, the first terminal and the second terminal spaced from each other and from other components in the ground monitor to prevent an arcing fault current for voltages less than or equal to 3000 volts (“V”).

A system for circuit protection, the system comprising:

• a ground monitor comprising a pilot conductor that injects an electric signal in a grounding conductor of a power cable assembly, and a ground return connected to the grounding conductor;
• a resistor assembly connected between a first terminal and a second terminal, the resistor assembly comprising a plurality of resistors connected in series between the first terminal and the second terminal, the resistor assembly connected in one or more of the pilot conductor and the ground return of the ground monitor;
• and
• a zener diode assembly connected between a zener connection point and the ground return of the ground monitor, the zener connection point comprising one of the one of the first terminal and the second terminal, the zener diode assembly comprising a plurality of zener diodes connected in series between the zener connection point and the ground return, the zener diode assembly sized to clamp a voltage from the zener connection point to the ground return to a value of less than or equal to a zener threshold voltage, the zener threshold voltage set above a nominal voltage on the pilot conductor,
• wherein the plurality of resistors, the plurality of zener diodes, the first terminal and the second terminal spaced to prevent an arcing fault current for voltages less than or equal to 3000 volts (“V”).