|
|
1.2.23
1 q" P/ q$ y" ~. b) E0 |+ D; k& K% W( [/ j8 `2 Q8 p1 k
class II luminaire) w4 \. P2 o! y5 o! T
Y% {2 d* `. i6 c9 T' oluminaire in which protection against electric shock does not rely on basic insulation only, but in
2 \* l$ d3 _$ o5 [7 O8 W! X* N
- @/ L3 D( Y) {, a9 Gwhich additional safety precautions such as double insulation or reinforced insulation are: I$ z9 A9 U! K* L; `
* R% ]+ c' N; O; |( z9 R9 ~3 k7 rprovided, there being no provision for protective earthing or reliance upon installation- i* Q( @, |" y% P* y
E2 o; g' \- E9 L
conditions: e5 [% h; i v8 ]+ T9 d( u9 ~7 H
4 R. n* U* u1 ?4 D9 K& B
NOTE 1 Such a luminaire may be of one of the following types:# x! h# C- W4 n( b! s& {( u. V" x. S
8 I" E, d8 r: e0 L0 O! E
a) A luminaire having a durable and substantially continuous enclosure of insulating material which envelopes all% K5 b5 w {( k% X) I( h! |2 M9 v
! ]" w5 D, K& B5 c2 emetal parts with the exception of small parts such as nameplates, screws and rivets which are isolated from live
( ^5 y' X0 Y+ g, D. ^6 L, x) G) B1 a p4 [) T& [
parts by insulation at least equivalent to reinforced insulation. Such a luminaire is called an insulation encased
& p# h" T3 x; L3 A" `2 c( i6 a/ ?8 B& s0 S) @% z5 n2 |
class II luminaire.
$ i p- K9 h; s }& ?' d+ G- r
. {" B3 d' O n0 j% nb) A luminaire having a substantially continuous enclosure of metal, insulated from live parts by insulation at least
0 I; D. |- u4 n" D
" c4 j# Q x6 Z/ H" {. q# Eequivalent to double or reinforced insulation. Such a luminaire is called a metal-encased class II luminaire.$ h' ~9 L4 a- p( f9 e
" B, z. r3 Z! J. H: E- j# o& gc) A luminaire which is a combination of types a) and b) above.. `' b& Y- Z; `) }) ^+ w7 B
; c3 W$ n! Q; K- q" N5 p2 j5 XNOTE 2 The enclosure of an insulation-encased class II luminaire may form a part or the whole of the
" U* g8 w1 [- i% f! H7 r( E. X
* u3 w1 X4 V; s/ q) \supplementary insulation or the reinforced insulation.
* G7 @' j W5 z/ E8 Z( {5 v" q' F3 F! z3 ]) W1 g- W
NOTE 3 If earthing is provided to assist starting, or for EMC reasons, but is not connected to an accessible metal
q* |: g" d' y& z) ^0 u K' n' y9 L
part, the luminaire may still be deemed to be of class II. Accessible metal parts in compliance with the appropriate& r+ ?+ l3 z, @
* M- `3 Z4 {* K' r6 TIEC lamp specification and other metal parts not normally earthed and not normally accessible during normal use# x7 K, y( G8 [( S8 e+ B7 [6 w
}. @% z3 {7 Y9 M$ O
are not regarded to be conductive parts which may cause an electric shock unless the tests of Annex A show them2 g9 p% p! f5 I8 X+ M
0 ^& _ ^& i# k+ Y- O! N! \to be live parts.* U9 }6 I0 c( Y7 _
% D; F3 x! N* N4 @% E' ^4 ZNOTE 4 If a luminaire with double insulation and/or reinforced insulation throughout has a safety earthing terminal' V, _2 E4 x" t% M# e7 m( C
) D, ]8 x. b' A, F
or a safety earthing contact, it is class I construction. However, a fixed class II luminaire intended for looping-in or8 ]7 b5 P' U7 L; D) i
3 V0 E" o* `5 l* _- n Nprovided with through wiring may have an internal terminal or contact for maintaining the electrical continuity of an
5 G( v& F+ g: k T3 b# E& b3 i
- y' e/ N. z6 i% Mearthing conductor not terminating in the luminaire, provided that the terminal is insulated from accessible metal
" q) I5 {% L" v# ~ q) w+ ?3 H2 ` Z5 e: @2 S5 x& X/ ~4 \/ h* B; _, M
parts by class II insulation.8 W. X1 O8 f! t; ^# c) F# e p
8 O( D, T2 k' A& I以上摘录自IEC60598-1:2008，Page 21。
* @5 F& y- m7 ~1 U7 ~
: ^3 a) T; M9 `! m! m# U. C但是，不管是 class I construction还是是Class II construction，都没有标准定义，请更多地参考其他标准。 |
|
/1 
|关于安规|小黑屋|安规QQ群|Archiver|手机版|安规网
( 粤ICP13023453-10 ) 
窥视卡
雷达卡
发表于 2012-6-8 14:44
收藏
分享
好帖
鸡蛋
提升卡
置顶卡
沉默卡
喧嚣卡
变色卡
抢沙发
千斤顶
显身卡
发表于 2012-6-8 14:58
楼主
