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加湿机UL998标准中,42.11章与42.12章,
0 k: j% R) ~# u42.11 For an extra-low-voltage safety circuit, if operation of the product with a short circuit or grounded- G1 e- _3 ^ b: R
circuit may result in unsafe operation of the controlled device, spacings shall be not less than as specified4 @! `/ D! F7 a- U# r- X( L7 S0 H& _
in Table 13.+ @1 l. A: U" m& Z0 v
42.12 For extra-low-voltage nonsafety circuits, spacings are not specified.1 Q* C, t0 J$ K7 m1 W4 H5 P5 L* r: k
$ g( p' T- }' S' l. z: _) I
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其中的extra-low-voltage safety circuit与extra-low-voltage nonsafety circuits怎么理解??谢谢. x. P B8 V2 p5 X5 ?7 W6 S4 f
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