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首先先列举相关语句:8 d6 p2 p# _' T: f: v& s
1.Annex Q中:VDR used in a PRIMARY CIRCUIT shall comply with IEC61051-2,....
7 Q. Z3 c' c5 l: H2.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.
1 }* v6 p4 V+ [- a! {9 I& Q It is not a requirement of this standard to comply with any particular component standard for surge suppressor used in SECONDARY CIRCUIT.
! V- e5 x. |* L) t4 ~下面说下我的问题,
7 k. b, \! [& C* w: j( d1.VDR是varistor的一种吗?. t" R2 {2 Q/ }
2.为什么UL60950-1不引用UL1449而是国际标准IEC61051-2来限定VDR) {/ M, [; s# m4 h: h
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。% Y; D; F" {+ ?" e5 Z
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。
$ P! Y' 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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