Testing of a lineman's safety strap shall be conducted by allowing a bag of sand to free fall __________.

The correct answer is that a lineman's safety strap shall be tested by allowing a bag of sand to free fall 4 feet. This requirement is essential to ensure that the safety strap can withstand the shock and force that would be exerted on it during a fall. By using a 4-foot drop, the test simulates a realistic scenario where the strap would need to absorb significant energy while providing adequate support and safety to the lineman.

Testing at this height ensures that the strap's materials and construction are reliable under conditions that might be encountered during actual use. If the strap fails to perform adequately during this drop test, it indicates potential weaknesses that could compromise safety.

Understanding the rationale behind the specified height for testing helps in recognizing the importance of safety protocols in working at heights and the necessity of proper equipment checks. This practice contributes to a culture of safety where linemen can be assured of their equipment's reliability.