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在最终产品标准UL458中描述:
# ?& H+ j& Y$ I$ I* g) `. p9 i8 w, C28.1.2 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.7 ?" E z8 z2 [
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请教,在UL840中,是参考clearance A 还是 Clearance B呢?6 J& }5 I: x9 }" T& C
依据是?
: e' w4 x2 j5 V3 ]9 e3 G% h另外补充,我们的产品是电动汽车DC-DC转换器。
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