This part specifies the verification items, technical requirements, verification appliances, methods of verification and result processing of the low-temperature test chamber. Applicable to the verification of the low-temperature test chamber workspace for Wire and cable. Among them, the technical requirements of the low-temperature test chamber shall not only comply with the provisions of this part, but also comply with the provisions of relevant standards; the temperature deviation of the workspace shall also comply with the requirements of the Wire and cable product standards. Verification appliances include Thermocouple group, DC digital voltmeter, Thermocouple switch, stopwatch and ice bottle, etc. The method of verification includes measuring the temperature of 9 measuring points in the measured space and adjusting the temperature of the test chamber to meet the requirements.