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1.2.23
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" { s6 ]% C1 k& Y2 n6 sclass II luminaire
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luminaire in which protection against electric shock does not rely on basic insulation only, but in
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which 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 installation6 r% I/ z/ \% J; F1 `' K0 p
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conditions
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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
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$ V7 X1 j. a6 g( Y1 Mmetal 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 encased6 Q+ M- X! J8 D: i
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class II luminaire.
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- q8 [7 i- n0 r' i- ^b) A luminaire having a substantially continuous enclosure of metal, insulated from live parts by insulation at least N: h! a T& \3 D' M' [* A, e6 w
1 e6 P- x T( }2 N. d- uequivalent to double or reinforced insulation. Such a luminaire is called a metal-encased class II luminaire., X+ [2 e5 y! Z
; r& F5 A. G8 s, i( h4 l1 d" Ac) A luminaire which is a combination of types a) and b) above.
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- g' P' C9 q9 L! O7 X& B# x9 `. INOTE 2 The enclosure of an insulation-encased class II luminaire may form a part or the whole of the" E: c$ ?! }9 \( Z' R: d. j) }
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supplementary insulation or the reinforced insulation.( X) s B& y3 u% N5 X
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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% h+ b2 y* @& Z3 N* L. o
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part, the luminaire may still be deemed to be of class II. Accessible metal parts in compliance with the appropriate& N6 h9 H; ^ X: @+ d
. \; v7 H- a1 \" YIEC lamp specification and other metal parts not normally earthed and not normally accessible during normal use3 p' ?# Z. d& J5 u/ @" U, f, a
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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.; I+ y) _4 p" Y) g, W
J/ H0 b# O6 RNOTE 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) P% |' x7 ?* ]! x$ v
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earthing conductor not terminating in the luminaire, provided that the terminal is insulated from accessible metal; D2 y" D5 R& l9 m0 C9 _5 d
6 Y$ O- ]5 c# ^% o H6 L% Mparts by class II insulation.
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以上摘录自IEC60598-1:2008，Page 21。, J9 v6 A/ j/ F" _2 B3 G& [' E' B
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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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