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PV Power Source
An array or collection of arrays that generates DC power
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PV Source Circuit
The circuit connecting a group of modules together and to the common connection point of the DC system
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PV Output Circuit
The circuit connecting the PV power source to the rest of the system
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Ampacity
The current that a conductor can carry continuously under the conditions of use without exceeding its temperature rating
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Junction Box
A protective enclosure used to terminate, combine, and connect various circuits or components together
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Combiner Box
A junction box used as the parallel connection point for two or more circuits
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Blocking Diode
A diode used in PV source circuits to prevent reverse current flow
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Bypass Diode
A diode used to pass current around, rather than through, a group of PV cells
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Overcurrent Protection Device
A device that prevents conductors or devices from reaching excessively high temperatures due to very high currents by opening the circuit
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Fuse
A metallic link that melts when heated by current greater than its rating, opening the circuit and providing overcurrent protection
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Circuit Breaker
An electrical switch that automatically opens as a means of overcurrent protection, and that can be manually opened as a disconnecting means
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Interrupting Rating
The maximum current that an overcurrent protection device is able to stop without being destroyed or causing an electrical arc
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Back-fed Circuit Breaker
A circuit breaker that allows current flow in either direction
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Disconnect
A device used to isolate equipment and conductors from sources of electricity for the purpose of installation, maintenance, or service
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Grounded
The condition of something that is connected to the earth or to a conductive material that is connected to the earth
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Grounding Electrode
A conductive rod, plate, or wire buried in the ground to provide a low-resistance connection to the earth
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Grounding Electrode Conductor (GEC)
A conductor connecting the grounding electrode to the rest of the electrical grounding system
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Grounded Conductor
A current-carrying conductor that is intentionally grounded
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Equipment Grounding Conductor (EGC)
A conductor connecting exposed metallic equipment, which might inadvertently become energized, to the grounding electrode conductor
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Ungrounded Conductor
A current-carrying conductor that has no connection to the ground
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Ground Fault
The undesirable condition of current flowing through the grounding conductor
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Ground-fault Protection
The automatic opening of conductors involved in a ground fault
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Ground-Fault Circuit Interrupter (GFCI)
A device that opens the ungrounded and grounded conductors when a ground fault exceeds a certain amount, typically 4 mA to 6 mA
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Surge Arrestor
A device that protects electrical devices from transients (voltage spikes)
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