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露天矿和采石场工地上用的电气装置,作业面广,流动性大,且经常遭受恶劣的户外环境的影响。为保证电气装置使用安全,国际电工委员会在1971年成立了71委员会,负责制订“户外恶劣条件(露天矿和采石场)用的电气装置”安全标准文件。 参加IECTC71的主要工作成员有美国、澳大利亚、西德、英、法和瑞典等国的矿山工业和矿用电气装置生产厂的专家和专业院校的学者们。 1975年,TC71在悉尼会议中明确了标准文件的总体结构。
Electrical installations used on open pit and quarry sites have a wide range of operations, high mobility, and often suffer from harsh outdoor environments. In order to ensure the safety of electrical installations, the International Electrotechnical Commission established 71 committees in 1971 to formulate safety standards documents for “outdoor harsh conditions (open pit and quarry) electrical installations”. The main working members participating in IECTC71 include experts from mining industry and mining electrical installations in the United States, Australia, West Germany, Britain, France, and Sweden, and academics from professional institutions. In 1975, the TC71 specified the overall structure of the standard document at the Sydney meeting.