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1.2.23 P, S* O% A$ H- d$ A
' k: h# o. ]' o2 I, e3 k% y& Rclass II luminaire2 @( T f, B0 }+ x& K* J
8 w* m' w }& \, g" h' ^. @( Hluminaire in which protection against electric shock does not rely on basic insulation only, but in
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+ ^. Q; t8 H$ o/ A1 [( Kwhich additional safety precautions such as double insulation or reinforced insulation are
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provided, there being no provision for protective earthing or reliance upon installation
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conditions0 D& h2 B' } ^/ M* y" `4 `& q
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NOTE 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 all3 @% W* `8 a+ `9 x) |
3 s! `- @, X9 B+ R. Smetal parts with the exception of small parts such as nameplates, screws and rivets which are isolated from live
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parts by insulation at least equivalent to reinforced insulation. Such a luminaire is called an insulation encased
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class II luminaire., ~' m% [: p8 E% t
6 e# u! V3 J) U% h9 p
b) A luminaire having a substantially continuous enclosure of metal, insulated from live parts by insulation at least2 p6 ?7 C. H- v# w5 G! U8 k
M' K+ k2 n, D' v: K. N# Pequivalent to double or reinforced insulation. Such a luminaire is called a metal-encased class II luminaire.) n; H1 X3 d0 E e2 X
# p7 i b0 k' Zc) A luminaire which is a combination of types a) and b) above." M2 ^. q+ Q: q! \3 y5 n
- A" [; l0 I* n8 c% }% Y$ Z: E0 qNOTE 2 The enclosure of an insulation-encased class II luminaire may form a part or the whole of the: e4 s0 M- Y0 x% d
0 o3 o/ J( h) S rsupplementary insulation or the reinforced insulation.
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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 appropriate
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0 H: r+ v: j1 X) |9 wIEC lamp specification and other metal parts not normally earthed and not normally accessible during normal use
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3 J+ c8 D& J" E5 V& iare not regarded to be conductive parts which may cause an electric shock unless the tests of Annex A show them8 d/ c" Q; f7 n: V9 P4 ^& ?8 W6 ]" O
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to be live parts.
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0 h4 f! j/ W% B# w; ?6 @5 nNOTE 4 If a luminaire with double insulation and/or reinforced insulation throughout has a safety earthing terminal
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+ `; I$ U! \2 b4 O. w6 L* Por a safety earthing contact, it is class I construction. However, a fixed class II luminaire intended for looping-in or
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0 a, d/ s: W) }+ w: Wprovided with through wiring may have an internal terminal or contact for maintaining the electrical continuity of an
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) z4 L8 z" w; {0 w$ pearthing conductor not terminating in the luminaire, provided that the terminal is insulated from accessible metal7 u6 q7 I' p/ g# d" ?+ p
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parts by class II insulation. _- J8 b2 ?" i- E, V
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以上摘录自IEC60598-1:2008，Page 21。5 R, I5 g1 F8 C$ r
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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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