NM CID EL-1 Practice Questions - New Mexico CID EL-1 Electrical Distribution Systems, Including Transmission Lines Examination Exam

The two primary purposes of system grounding on a multi-grounded wye distribution line are to:

increase line impedance and prevent any current during a ground fault stabilize phase-to-ground voltage during normal operation and provide a low-impedance return so protective devices can clear ground faults eliminate the need for lightning arresters allow the neutral to be fused at each pole

Correct Answer:

stabilize phase-to-ground voltage during normal operation and provide a low-impedance return so protective devices can clear ground faults

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