UL458 中的dead-metal 与 live-metal是什么意思？

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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.

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; a" i, u& e! Y' B; D& a4 T这两个单词怎么翻译啊？大家怎么看？
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炎黃

在這標準裡用法就我理解
dead-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

. e  W; Z& |/ u5 i( ylive-metal parts 導電金屬部件

kodxiao

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。