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1.2.23
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) S; ?' f: H6 ~! x5 Bclass II luminaire: X; e+ f$ l6 K% `" o
) E7 J" G) v) t: ]/ `. F9 W3 k: |luminaire in which protection against electric shock does not rely on basic insulation only, but in
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4 _ L9 t5 U& X. g* Hwhich additional safety precautions such as double insulation or reinforced insulation are: I1 s/ B* s- @( n% @+ h
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provided, there being no provision for protective earthing or reliance upon installation
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7 P% g$ [; _9 |6 I0 Econditions
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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 all) F, j" a/ j+ A/ X; y
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metal 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.
, |7 \% S( r; v& V x! g8 w! x
# J; U! N! W7 \ W' @b) A luminaire having a substantially continuous enclosure of metal, insulated from live parts by insulation at least
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# R$ f) [- y8 S- w* g3 D5 tequivalent to double or reinforced insulation. Such a luminaire is called a metal-encased class II luminaire.% K9 J. }8 v8 ]9 E" m7 u6 j
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c) A luminaire which is a combination of types a) and b) above.% N, e% T8 ^7 `: |0 M4 o: v
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NOTE 2 The enclosure of an insulation-encased class II luminaire may form a part or the whole of the* X! V0 d6 F* c2 U$ ^0 P
D4 K3 J9 Y+ i! A1 g2 y$ Lsupplementary 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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) ~$ K" G8 Y% w4 H0 n" gpart, the luminaire may still be deemed to be of class II. Accessible metal parts in compliance with the appropriate7 |# I4 _5 S2 T
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IEC lamp specification and other metal parts not normally earthed and not normally accessible during normal use: W2 f3 M; o" _; W" ?9 D+ s+ q1 ]
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are not regarded to be conductive parts which may cause an electric shock unless the tests of Annex A show them
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to be live parts., \" I4 l/ G" A" B' o6 Q( Y* w7 g, B" j
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NOTE 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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& T! ]4 Z/ D+ A5 e& [provided with through wiring may have an internal terminal or contact for maintaining the electrical continuity of an. b+ y3 ]+ o' X" v
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earthing conductor not terminating in the luminaire, provided that the terminal is insulated from accessible metal
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parts by class II insulation./ c2 V8 q8 z$ Q# j
' D# W( y; q& t7 }2 O% A5 D- r+ T以上摘录自IEC60598-1:2008，Page 21。$ i! T' f0 g1 E( b) ?% N) [
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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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