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! p4 Z% B3 |, G' c7 y1 Oclass II luminaire3 w! v3 ~$ J- J: K! q
; I! I6 |/ I( L6 ]& n$ zluminaire 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; ?" V3 j+ b( d' L1 V, p
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provided, there being no provision for protective earthing or reliance upon installation% Q4 ]0 t! Y r7 k" B
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conditions# p1 S$ Z$ `1 u! D
& o+ c0 B( _& X. @. ^9 U# kNOTE 1 Such a luminaire may be of one of the following types:
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L' k% g. {) e g* W1 za) A luminaire having a durable and substantially continuous enclosure of insulating material which envelopes all
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1 h* w3 ^5 B) o6 e/ D( ~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.
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b) A luminaire having a substantially continuous enclosure of metal, insulated from live parts by insulation at least
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% |- }1 |+ D/ c+ ?6 mequivalent to double or reinforced insulation. Such a luminaire is called a metal-encased class II luminaire.* S5 @/ T; a& ]0 f$ ^2 x# `
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c) A luminaire which is a combination of types a) and b) above.4 J7 M& f( L1 q7 G9 V# N! K- t
" }3 R/ O# ?% z" L5 \NOTE 2 The enclosure of an insulation-encased class II luminaire may form a part or the whole of the' d; ]* G/ A$ U: F: N, N
% [1 ]+ s" y5 w1 j5 v0 C, usupplementary insulation or the reinforced insulation." W( ^* d: x) Z8 h; y3 @, }
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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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% P. K9 b! ~- i# q- Lpart, the luminaire may still be deemed to be of class II. Accessible metal parts in compliance with the appropriate
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IEC lamp specification and other metal parts not normally earthed and not normally accessible during normal use
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6 S# m. m, |) b% N1 `are not regarded to be conductive parts which may cause an electric shock unless the tests of Annex A show them) N G! L) t& W" |0 J7 S
2 O8 Y! s& Q9 ?! _: n2 pto be live parts.
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: b9 F, S* a3 f: w% Y7 ~1 WNOTE 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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/ F* p6 v7 \$ O4 _3 ~% U5 ]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 metal9 I. F( c) K, ?( N6 x" P8 I
, w0 ?( U, |5 v5 r' J) j) _parts by class II insulation.6 K7 @. w( z6 q2 n- `* `6 l' X& ?
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以上摘录自IEC60598-1:2008，Page 21。5 Y" J; O K7 I2 F1 m6 D
; c% l1 D) s4 s% l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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