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在最终产品标准UL458中描述: - k& N, J+ d f5 U1 ~" r2 m' C! z
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.8 a# s2 }2 K, P) g4 T/ L
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$ E5 T( M& m) g l7 p请教,在UL840中,是参考clearance A 还是 Clearance B呢?, E6 P" { n" `
依据是?
5 b; E$ X4 v! U1 s: M* M& T8 h另外补充,我们的产品是电动汽车DC-DC转换器。- W1 t& ~; K: ~! D
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