Electrical Exam Term
Ground (Earth)
A conducting connection between an electrical circuit or equipment and the earth, or to a conducting body that serves in place of the earth.
Detailed Explanation
Grounding serves two primary purposes: stabilizing voltage (limiting voltage from lightning or line surges) and providing a path for fault current to trip overcurrent devices. NEC Article 250 is the comprehensive reference for grounding and bonding. The grounding electrode system typically includes ground rods (minimum 8 feet long), concrete-encased electrodes (Ufer grounds), water pipe electrodes, and ground rings.
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