While the coiled portion is extended to three times its retracted length, the cable shall be conditioned by placing it in an air oven maintained at a temperature of 160°F ± 2°F for 20 hours. While maintained at 160°F ± 2°F, the coiled portion shall be capable of meeting the following requirements: After the coiled portion is extended further to 5 times its retracted length and stretched and returned in this manner for a total of 3 times, the coiled portion shall not exceed 325% of its original retracted length when the cable is held vertically for thirty seconds.