Which method is acceptable for equipment grounding?

Which method is acceptable for equipment grounding?

• A. Plastic connection
• B. Screw, clip, metallic connection underneath lugs
• C. Rubber washer
• D. Wooden support

Answer: (B)

Equipment grounding is an essential safety measure that helps prevent electrical shock and fire hazards by providing a path for fault current to flow back to the ground. The method chosen for grounding must ensure a reliable and low-resistance connection.

The use of a screw, clip, or metallic connection underneath lugs is appropriate because these materials are conductive and can effectively establish a low-impedance path to the ground. Metal components provide good electrical conductivity, which is crucial for grounding systems to function properly during fault conditions. This method also supports secure mechanical connections, maintaining reliability over time.

In contrast, plastic connections are non-conductive, so they do not provide a reliable grounding mechanism. Rubber washers would similarly fail to create an effective grounding path due to their insulating properties. Wooden supports do not conduct electricity, making them unsuitable for grounding purposes as well.

Thus, the method involving metal connections under lugs meets the requirements for an effective grounding system, promoting safety and functionality in electrical installations.