39 Strain Relief And TorqueTests39.1 The strain-relief means provided on the power supply cord shall be subjected to the test specified in39.2 and 39.3. As a result of the test, relief means shall withstand for 1 minute, without displacement, a pull of 35 pounds (156 N) applied to the cord, with the connections within the appliance disconnected. The strain relief is not acceptable if, at the point of disconnection of the conductors, there is such movement of the cord as to indicate that stress would have resulted on the connections.39.2 A 35-pound (15.9-kg) weight is to be suspended from the power supply cord and supported by the appliance so that the strain-relief means will be stressed from any angle that the construction of the appliance permits.39.3 A power supply cord shall withstand for 1 minute a torque of 50 ounce-inches (0.353 N·m) applied 1 inch (25.4 mm) from the strain relief without damage to the cord and without transmitting the torque to the terminations.