Washington Administrative Code(WAC) and Revised Code of Washington (RCW) Electrical Practice Exam

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Why is a maximum ground resistance of 25 ohms important for rod, pipe, or plate electrodes?

To enhance physical appearance of the installation
To ensure effective grounding and safety
To comply with aesthetic regulations
To reduce material costs

The correct answer is: To ensure effective grounding and safety

A maximum ground resistance of 25 ohms is critical for rod, pipe, or plate electrodes because it ensures effective grounding and safety. Grounding systems are designed to protect both people and equipment from electrical faults by providing a low-resistance path for fault currents to flow into the earth. When the ground resistance is 25 ohms or less, it minimizes the risk of hazardous voltage levels during electrical faults, thereby protecting individuals from electric shock and mitigating the potential for damage to electrical equipment. If the ground resistance exceeds this threshold, it may not be sufficient to effectively dissipate electrical energy, leading to safety issues such as shock hazards and increased risk of equipment failure. Therefore, maintaining a maximum ground resistance of 25 ohms is crucial for the effectiveness of grounding systems, ensuring reliable operation of electrical systems and promoting safety in electrical installations.