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加湿机UL998标准中,42.11章与42.12章,
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" ~3 P5 [; w3 M, W. y2 P circuit may result in unsafe operation of the controlled device, spacings shall be not less than as specified) s, i! v: X8 K
in Table 13.1 P+ p3 o A, f' Y
42.12 For extra-low-voltage nonsafety circuits, spacings are not specified.
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. S* U; X% J3 P1 e* @& N9 V, R" k/ w3 [# T9 l; j
其中的extra-low-voltage safety circuit与extra-low-voltage nonsafety circuits怎么理解??谢谢
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