Abrupt Pull Test
UL 817 is the U.S. standard for cordsets and power supply cords. NEMA plugs used in these cords are required to pass a strain relief test in UL 817 section 99, known as the abrupt pull test. This test ensures that a pull force on the cord does not transmit to the internal plug terminations. During this test, the plug is mounted in a 45 degree steel plate. The plug blades and ground pin are anchored in the plate. A fixture with a rod, striker plate and a 1.1 kg (2.5 pound) weight are clamped to the cord. The weight is dropped 25 times. During and at the completion of this test, there is to be no loss of electrical continuity.