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1.2.23
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class II luminaire- w( c+ G1 r1 c- s
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luminaire in which protection against electric shock does not rely on basic insulation only, but in$ }" i! l( \8 ]5 Q9 ?$ P3 C
5 ^: L( G% ^3 R# r* O+ wwhich additional safety precautions such as double insulation or reinforced insulation are3 f: |8 s( C, H5 G# M
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provided, there being no provision for protective earthing or reliance upon installation
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% m7 {3 j7 P V: _8 k, J: } d1 Z) Kconditions
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* {* {1 C5 S% w2 u) a' N0 S) D# CNOTE 1 Such a luminaire may be of one of the following types:
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a) A luminaire having a durable and substantially continuous enclosure of insulating material which envelopes all
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, n% }0 }! I1 q* j; lmetal parts with the exception of small parts such as nameplates, screws and rivets which are isolated from live
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' U9 ^: x7 g: zparts by insulation at least equivalent to reinforced insulation. Such a luminaire is called an insulation encased
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% ?$ h$ a" p Fclass II luminaire.) i# m2 o' m, |8 O) b' X- C( P5 B) o+ S
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b) A luminaire having a substantially continuous enclosure of metal, insulated from live parts by insulation at least( G9 ~% v( R, S$ g! f9 W
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equivalent to double or reinforced insulation. Such a luminaire is called a metal-encased class II luminaire.
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7 W+ u+ H2 o! w8 Gc) A luminaire which is a combination of types a) and b) above.9 S& L4 i" V# S, X. `1 c
+ {' y% K* v: l3 O7 t- GNOTE 2 The enclosure of an insulation-encased class II luminaire may form a part or the whole of the3 R3 {4 K# g" U# |1 X
" @. Q, \+ F5 y L) L ], ^supplementary insulation or the reinforced insulation.& }3 {: Z& g* \
$ l9 v) K M' E6 I* Z+ }NOTE 3 If earthing is provided to assist starting, or for EMC reasons, but is not connected to an accessible metal
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part, the luminaire may still be deemed to be of class II. Accessible metal parts in compliance with the appropriate4 h' o7 c) ~# ]4 i
- H" W* W2 H# l1 X5 lIEC lamp specification and other metal parts not normally earthed and not normally accessible during normal use
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are not regarded to be conductive parts which may cause an electric shock unless the tests of Annex A show them6 `, e" W" P6 i& r/ W' ~+ T% T
: t l" Q4 X+ x( Ito be live parts.) O* ^& I! T8 i2 k- J1 F1 h8 F
& N9 B! a& Q# K/ sNOTE 4 If a luminaire with double insulation and/or reinforced insulation throughout has a safety earthing terminal
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or a safety earthing contact, it is class I construction. However, a fixed class II luminaire intended for looping-in or
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provided with through wiring may have an internal terminal or contact for maintaining the electrical continuity of an
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earthing conductor not terminating in the luminaire, provided that the terminal is insulated from accessible metal! F2 q4 r3 ?/ t* T/ c: G) l7 V/ y
0 F7 @+ D1 y3 R8 `parts by class II insulation.9 n( Q& o; l6 u6 R
3 n+ h: i/ H( d5 ?' I% {. I1 Y以上摘录自IEC60598-1:2008，Page 21。
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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。 |
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发表于 2012-6-8 14:44
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