1.1本试验方法包括在大气压力下测定薄膜绝缘圆形磁铁线在空气中的耐热性。它不适用于纤维绝缘的磁性导线，如棉花或玻璃。 注1-其他固体导体，如涂层电阻丝，可通过本试验方法进行评估。 1.2以英寸-磅为单位的数值应视为标准值。括号中的国际单位仅供参考。 1.3本试验方法包括通过观察交流耐压试验响应的变化来评估耐热性。通过观察磁线绝缘的其他特性的变化来评估耐热性，需要使用不同的测试方法。 1.4在没有空气的情况下，将某些类型的薄膜绝缘导线暴露在气体或液体环境中进行加热，可能会产生不同于在空气中获得的耐热性值。在解释通过在空气中加热获得的结果时，应考虑到这一事实，因为在使用中电线不会暴露在空气中。 1.5在超过甚至接近放电起始电压的水平下长时间施加的电应力可能会显著改变涂膜或未涂膜绝缘导线的耐热性。在这种电应力条件下，材料之间的比较也可能不同于使用该方法进行的比较。 1.6 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前咨询并建立适当的安全和健康实践，并确定监管限制的适用性。

1.1 This test method covers determination of the thermal endurance of film-insulated round magnet wire in air at atmospheric pressure. It is not applicable to magnet wire with fibrous insulation, such as cotton or glass. Note 1—Other solid conductors such as coated resistance wire may be evaluated by this test method. 1.2 The values stated in inch-pound units are to be regarded as the standard. The SI units in parentheses are provided for information only. 1.3 This test method covers the evaluation of thermal endurance by observing changes in response to ac proof voltage tests. The evaluation of thermal endurance by observing changes in other properties of magnet wire insulation requires the use of different test methods. 1.4 Exposure of some types of film insulated wire to heat in gaseous or liquid environments in the absence of air may give thermal endurance values different from those obtained in air. This fact should be considered when interpreting the results obtained by heating in air with respect to applications where the wire will not be exposed to air in service. 1.5 Electric stress applied for extended periods at a level exceeding or even approaching the discharge inception voltage may change significantly the thermal endurance of film insulated wires, varnished or unvarnished. Under such electric stress conditions, comparisons between materials may also differ from those developed using this method. 1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to consult and establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.