|
“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?+ ]: ?0 |0 n% q; H3 |
" a) H( ]! V# @; [: x: S" a" b- R: MUL标准举例自UL1993定义:, B" F! @; `# o; ?# s1 y% ~9 b/ K
3.7 ENCLOSURE – a material provided to enclose parts and components that can involve the risk of fire or shock hazard.
# h' g$ o$ N+ _/ Y9 [1 ~
, w0 y! C- S' `0 L/ {# ?8 M7 _: JIEC标准举例自IEC61032:( m( z7 a+ A6 m# v
3.1 Enclosure
# x% I; Q( ~0 o8 Y4 A6 x7 C8 {- G$ u, l, `A part providing protection of equipment against certain external influences and, in any direction, protection against direct contact [IEV 826-03-12]
& l% R$ e, j: C5 r; {NOTE – This definition taken from the International Electrotechnical Vocabulary (IEV) needs the following additional explanations:
4 ~ z8 U( D6 U* l$ _$ m( |a) Enclosures provide protection of persons or livestock against access to hazardous parts.9 x) `0 V& I2 ~& R2 @% M
b) 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.! e* \" x+ W2 Y% b
(see 3.1 of IEC 60529).4 t) Q( n7 |; `
0 @) H1 h, V! p% T9 r
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。) `( I1 A6 a7 v7 N4 s8 X) |9 o
2 [9 g/ F8 ]$ I; Z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。6 r* s' L; R. u. P
1 I. Q5 u" ^5 t5 G4 c* F, O- w譬如,UL1993对Polymeric Material的Enclosure的要求: l. }) k- U3 j& v+ v* A
5.3.3 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. 0.17.7 P9 ?% M5 u( @- d( Y V4 r
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。/ U2 Z6 n% Z3 k1 l5 P, m
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?- ^; l! {2 h n' \
& n- X, y; } M, r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。
* J. C% l$ c7 F" C$ e! W7 k; N, @* `
|
评分
-
查看全部评分
|