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1.2.23
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class II luminaire- d% V$ G5 |& x4 d1 Z
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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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% I }* T f( b/ a0 i6 h; x7 Q/ Hprovided, there being no provision for protective earthing or reliance upon installation! @5 G: |* t9 W* Z& I
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* @# m$ N3 e- {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 F5 i2 L# F6 P l3 L/ @
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metal parts with the exception of small parts such as nameplates, screws and rivets which are isolated from live( z' O$ e. G9 P1 S" \! s
- w# O# l, |6 S' K% Iparts by insulation at least equivalent to reinforced insulation. Such a luminaire is called an insulation encased. |* w0 c) Z& I
& j9 D- o# R9 e7 Aclass II luminaire.0 J# [; {! Y$ H' K
" v3 v* \5 ]! N8 n; Ob) A luminaire having a substantially continuous enclosure of metal, insulated from live parts by insulation at least( j d; j( j, E- r
/ Q3 c* V0 t6 ?/ @, ]* T5 U' W- Aequivalent to double or reinforced insulation. Such a luminaire is called a metal-encased class II luminaire.
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c) A luminaire which is a combination of types a) and b) above.
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NOTE 2 The enclosure of an insulation-encased class II luminaire may form a part or the whole of the
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5 y. g [" ~5 _2 E% \% f0 P4 ]3 `supplementary insulation or the reinforced insulation.
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0 r2 z- \7 h/ ?# DNOTE 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% } [6 S x! k4 B' G( Q* d+ m" b: ]
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IEC lamp specification and other metal parts not normally earthed and not normally accessible during normal use; J) k8 l7 ` l; V" o
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are not regarded to be conductive parts which may cause an electric shock unless the tests of Annex A show them4 n% d3 @3 o+ G* s5 I' P
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to be live parts.
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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 or7 f( a. {/ ^7 D4 e. w
0 N# ?$ z8 D! O' M' T. S* l& Hprovided 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
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parts by class II insulation.6 \; Z9 x5 B; ?
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以上摘录自IEC60598-1:2008,Page 21。8 R8 G$ w" f6 H# n7 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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