引言 在英国,国家电气规程(NEC)是关于危险场所分类和专用设备选型的现行文件。虽然美国采用的防爆技术很多,但是,最常用的是气体防爆和粉尘防爆技术。本文设法使读者熟悉一些能有助于他们按照美国标准确定或安装危险场所用设施的一些术语和概念。 国家电气规程 在美国,大多数电气设备都是按照NEC进行安装的。NEC文件是由国家防火协会(NFPA)的NEC委员会编制的。NEC是每三年审查更改一次的动态文件,以适应新的情况和采用新技术。 NPFA把NEC文件保留和修改的责任授给NEC规程委员会。该规程委员会由若干分委员会即小组组成,每个分委员会专门研究该规程的一章或数章。例如, Introduction In the United Kingdom, the National Electrical Code (NEC) is the current document on the classification of hazardous locations and the selection of special equipment. Although there are many explosion-proof technologies in the United States, the most commonly used are gas explosion-proof and dust explosion-proof technologies. This article seeks to familiarize readers with some of the terms and concepts that can help them identify or install facilities used in hazardous locations according to U.S. standards. National Electrical Code In the United States, most electrical equipment is installed in accordance with NEC. The NEC document was prepared by the NEC Commission of the National Fire Protection Association (NFPA). NEC is a dynamic document reviewed every three years to adapt to new situations and adopt new technologies. NPFA delegates the responsibility for the retention and modification of NEC documents to the NEC Rules Committee. The rules committee consists of a number of sub-committees or groups, each of which specializes in one or more chapters of the regulation. E.g,