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“Enclosure”在产品安规认证中的判断,意义非常重大,与普通意义上的“外壳”有很大的区别。那么怎么才能确定一个部件是不是“Enclosure”呢?3 Y' @8 K# C$ W# z9 o2 W1 Z8 A$ A# r
: Z/ b+ b" N" iUL标准举例自UL1993定义:
- u9 j$ F* Q3 T4 n/ M, g" H3.7 ENCLOSURE – a material provided to enclose parts and components that can involve the risk of fire or shock hazard.
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IEC标准举例自IEC61032: f2 L- N, q% s: D* Z! |* C- l
3.1 Enclosure
$ g+ f$ k# `+ ]( fA part providing protection of equipment against certain external influences and, in any direction, protection against direct contact [IEV 826-03-12] : a& a" w% L; p0 r7 p- m6 n
NOTE – This definition taken from the International Electrotechnical Vocabulary (IEV) needs the following additional explanations:
* w/ @. ^: g' \0 J8 ]a) Enclosures provide protection of persons or livestock against access to hazardous parts.
3 U% X- Y2 {7 J" z, l9 M% nb) Barriers, shapes of openings or any other means – whether attached to the enclosure or formed by the enclosed equipment – suitable to prevent or limit the penetration of the specified test probes are considered as a part of the enclosure, except when they can be removed without the use of a key or tool.2 t: K# B5 Y3 t" M
(see 3.1 of IEC 60529).7 D* ~' C& I$ m6 w; @
1 _0 u: G( _1 C( E! f1 s7 `! m通过这两个定义,很明显地可以看出,Enclosure是一个用于防止involve the risk of fire or shock hazard的部件,或者说是用以提供protection of equipment against certain external influences的部件。 M+ v/ o- U# h; \. {. v% A
8 P8 }. b% D" q( a7 ]( h据此,如果部件不是提供此类防护,事实上它并不是Enclosure,这时候Enclosure的要求可能并不适用。
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y" w+ \0 ^/ ?' o1 d譬如,UL1993对Polymeric Material的Enclosure的要求:
) d4 e B- U6 B2 B# g7 o7 n5.3.3 A polymeric material used as an enclosure shall have a flammability rating of 5-VA, 5-VB, or V-0 in accordance with UL 94 or CAN/CSA-C22.2 No. 0.17.
% L+ J- w; E: w如果某个部件判定是否为Enclosure时不确定,可能是Enclosure,可能不是Enclosure,这时候该部件是否需要满足UL1993的5.3.3要求就变得非常重要了。
- |& I& b# m! B1 s& F& \大家都知道,5-VA, 5-VB, or V-0的材料成本远远高于HB类材料的成本,那么判定一个部件是不是Enclosure是否就极具成本价值了呢?
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9 w$ ?; G9 f! M欢迎大家深入讨论关于Enclosure的判定或者相关类似条款的判定的重要性。
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