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首先先列举相关语句:! v7 g1 n2 p6 j/ ^
1.Annex Q中:VDR used in a PRIMARY CIRCUIT shall comply with IEC61051-2,....
- \. k" J \+ J- B: U2.UL60950 1.5.9.4:It is permitted to use any type of surge suppressor,including a voltage depended resistor(VDR),in a SECONDARY CIRCUIT.
! D' H8 R) a3 ~; E$ P5 a* Z/ E It is not a requirement of this standard to comply with any particular component standard for surge suppressor used in SECONDARY CIRCUIT.
! X* h! ^, }. Z; G( r2 ?下面说下我的问题,/ ?7 ~4 T2 h* f: O6 i
1.VDR是varistor的一种吗?8 S. v2 x( N! y; S- {; K
2.为什么UL60950-1不引用UL1449而是国际标准IEC61051-2来限定VDR+ c4 [7 }* v+ u2 L+ ]* G: U& Z: g
3.从上面列举的语句看,是不是说对于放置在二次电路的VDR或者VARISTOR没有要求。是否说明在二次电路的VDR和VARISTOR不需要UL认证。4 Z) ^2 V6 o, C% D" W
4.如果一电路时SELV电路,对于VDR或者varistor有什么要求?还是均没有要求,无论是在一次还是在二次电路。
+ Z5 s& U3 L* x- J0 H( X以上疑问,请专业人士,有经验人士解答。感激不尽! |
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