Electrical Exam Term
Equipment Grounding Conductor (EGC)
A conductor that connects non-current-carrying metal parts of equipment to the grounding system, providing a low-impedance path for fault current.
Detailed Explanation
The EGC ensures that if a fault occurs (such as a hot wire touching a metal enclosure), the fault current will flow back to the source through the EGC, causing the overcurrent device to trip. EGCs can be bare, covered, or insulated conductors, or metallic raceways. NEC Table 250.122 specifies the minimum size of the EGC based on the rating of the overcurrent device protecting the circuit.
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