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在最终产品标准UL458中描述:
3 J9 r5 V8 G$ `5 c p7 [7 o0 [" c& ?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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请教,在UL840中,是参考clearance A 还是 Clearance B呢?
* u" w4 `3 K; Y h依据是?
% W+ u+ ~% d# `& G9 _- H另外补充,我们的产品是电动汽车DC-DC转换器。
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