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1.2.23
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/ T8 T, p+ H1 Yclass II luminaire
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luminaire in which protection against electric shock does not rely on basic insulation only, but in% \2 o7 [4 ^8 I2 Y& o9 u8 u& _
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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 installation
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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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2 A' \! h' v) t4 k$ T" l! la) A luminaire having a durable and substantially continuous enclosure of insulating material which envelopes all
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) y" l" O& D# smetal parts with the exception of small parts such as nameplates, screws and rivets which are isolated from live
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* V/ \9 G: S8 bparts by insulation at least equivalent to reinforced insulation. Such a luminaire is called an insulation encased+ X: f& U; h) `: o; u1 X3 y
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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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P" q8 I, b+ n$ c% F g8 {equivalent 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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/ ~) |. @1 L5 Z6 `: mNOTE 2 The enclosure of an insulation-encased class II luminaire may form a part or the whole of the
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5 X) r N0 F; A5 Y, B, P/ Osupplementary insulation or the reinforced insulation.
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, j+ ~- l6 H, w2 Y8 G- {2 }0 ?NOTE 3 If earthing is provided to assist starting, or for EMC reasons, but is not connected to an accessible metal+ ?3 H. u$ R' @* Z5 k
$ s2 r# Y0 n+ i! t- Ipart, the luminaire may still be deemed to be of class II. Accessible metal parts in compliance with the appropriate
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- m( e* O E0 OIEC lamp specification and other metal parts not normally earthed and not normally accessible during normal use
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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.) e( F3 F+ L7 G! G$ h
2 m; w* c- u/ a/ C6 \9 ]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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2 u6 n4 ^' H0 C( Q6 ?0 ]7 y# Rprovided 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 metal2 T4 ?2 x3 j% X; O5 F$ ~
" J; Q p. T! V) [parts by class II insulation.
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以上摘录自IEC60598-1:2008，Page 21。
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$ I0 o* G& w! Y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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