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加湿机UL998标准中,42.11章与42.12章,
/ w) |' e( B- D; J2 v42.11 For an extra-low-voltage safety circuit, if operation of the product with a short circuit or grounded
& R, O" C* t9 `( I% N+ s circuit may result in unsafe operation of the controlled device, spacings shall be not less than as specified1 _; U" x+ v; J( L: r8 B' k
in Table 13.
1 E! d$ G" l( k4 U6 {! e5 d7 Z- \" Y42.12 For extra-low-voltage nonsafety circuits, spacings are not specified.
, z* [* S$ U& e! J2 p9 z% ^8 W( K3 m4 r* ]0 S1 b T
* S }& F# l- ?
其中的extra-low-voltage safety circuit与extra-low-voltage nonsafety circuits怎么理解??谢谢, |5 B! f! X/ T) r7 \: B, g
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