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本帖最后由 火水晶 于 2015-3-4 10:51 编辑 5 s: G! N7 z+ l0 D+ z
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如标题描素，在UL458中经常可以看到Dead-metal 和 live-metal 两个单词，如下文节选。28.1.2 With reference to Exception No. 1 to 28.1.1 and with reference to UL 840, reduced through-air spacings are based on the use of insulating materials that resist arc tracking and the degree of conductive pollution present in the environment of use. They are applicable to a unit in which the transient voltages are known and are controlled by a transient suppressive device and to a unit that withstands an impulse withstand voltage test. The spacing requirements of UL 840 shall not be used for field-wiring terminals and spacings to a dead metal enclosure.
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28.1.7 With reference to Exception No. 2 to 28.1.1 concerning conformal coatings, minimum spacings of 1/32 in (0.8 mm) between adjacent foils shall be maintained. A conformal coating on printed wiring boards is not considered as insulation in lieu of spacings between a foil on a printed wiring board and uninsulated live-metal parts of opposite polarity or to uninsulated dead-metal parts.; o1 i, d1 V' @$ u2 h
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3 X! v2 A. r. v4 G这两个单词怎么翻译啊？大家怎么看？
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发表于 2015-3-4 09:14
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