The strain relief on AC grounding conductors must withstand a pull of how many pounds?

The correct answer reflects the requirement that the strain relief on AC grounding conductors must be capable of withstanding a pull of 35 pounds. This specification is crucial for ensuring the safety and reliability of electrical installations. Strain relief serves to prevent mechanical stress on the grounding conductor, which can occur during operation or maintenance. If the strain relief does not meet this pull strength, it could lead to damage or disconnection of the grounding system, posing a risk to both equipment and personnel.

Additionally, various industry standards and guidelines, such as those set by the American Boat and Yacht Council (ABYC), emphasize the importance of maintaining robust connections in electrical installations to prevent potential hazards. A grounding conductor that is properly secured and can withstand the specified pull strength enhances the overall electrical system's integrity, minimizing the risk of electrical shock, equipment failure, or fire hazards.

While the other options represent pull strengths that might seem adequate, they do not meet the established standards of safety and reliability required in marine applications, where environmental factors can also add additional stresses to the electrical connections.