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加湿机UL998标准中,42.11章与42.12章,$ ~$ q) ~& S1 l8 z' q# Y/ J0 Y1 G
42.11 For an extra-low-voltage safety circuit, if operation of the product with a short circuit or grounded
& S5 o0 E# ^* {- B circuit may result in unsafe operation of the controlled device, spacings shall be not less than as specified
3 F- |) ~6 M* G2 O1 J in Table 13.: r+ F* a/ L; O
42.12 For extra-low-voltage nonsafety circuits, spacings are not specified.
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4 w2 Z4 {6 R4 g3 H. E" K3 x3 B2 u6 M( t$ Z2 q, f1 f3 X U
其中的extra-low-voltage safety circuit与extra-low-voltage nonsafety circuits怎么理解??谢谢: M8 ?$ x& }) P( s& @) K& j
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