标题: UL458 中的dead-metal 与 live-metal是什么意思？ [打印本页] 作者: 火水晶 时间: 2015-3-4 09:14 标题: UL458 中的dead-metal 与 live-metal是什么意思？ 本帖最后由 火水晶 于 2015-3-4 10:51 编辑 2 _( C( f2 [' J3 j/ Z: C$ e$ y" |
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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. 5 F- u/ u6 p% O! Z. ~7 j/ g( z8 u3 A. }, ^
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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.& J+ D ~: B* y3 [& l
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8 ^; [/ }/ M2 g/ K这两个单词怎么翻译啊？大家怎么看？ 4 F& }$ E. G! U( \ O3 P R作者: 炎黃 时间: 2015-4-17 10:27
在這標準裡用法就我理解 ) {, E! g+ e8 m5 D1 idead-metal parts 非導電金屬部件(當金屬表面有塗佈絕緣漆或其他絕緣處理時)，或非金屬材質部位 8 `' L0 I5 ~2 j1 D/ ~: G. `, I% c2 C/ D: g" x
live-metal parts 導電金屬部件作者: kodxiao 时间: 2015-7-13 09:22
Dead-metal部件，通常都意味着，你必须保证它与带电件有良好的隔离，同时最重要的是它一定要有良好和可靠的接地。