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1.2.23
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class II luminaire) I8 L! a, P, Q" k0 u/ Q a
4 W$ `2 {1 k) |9 L9 ^- ]
luminaire in which protection against electric shock does not rely on basic insulation only, but in/ v& I' g/ d' F O
. L1 c+ s: J2 Fwhich additional safety precautions such as double insulation or reinforced insulation are
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! F f4 r8 b/ T- ^/ A+ I0 Q& _provided, there being no provision for protective earthing or reliance upon installation) u& }3 s5 J( a7 {
5 r I& N; \8 V4 [: bconditions1 ]+ g7 a1 D& ~' f
) t7 {: b1 B9 ]" h8 `+ yNOTE 1 Such a luminaire may be of one of the following types:& d! \9 x% f$ b- t
3 K/ ]& X8 n/ W- n8 P1 s+ o% N Za) A luminaire having a durable and substantially continuous enclosure of insulating material which envelopes all
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5 a4 U' U4 ~$ |# Tmetal parts with the exception of small parts such as nameplates, screws and rivets which are isolated from live
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$ Y+ v0 Y( A/ {& Nparts 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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1 w. _7 s: z, a/ B8 J" U1 ~( |" Zb) A luminaire having a substantially continuous enclosure of metal, insulated from live parts by insulation at least/ J% N8 z( v5 |1 t* K4 I$ Q
: S6 y& ?8 |7 U _9 N: W0 Yequivalent to double or reinforced insulation. Such a luminaire is called a metal-encased class II luminaire.
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' L* u/ D2 I1 Wc) 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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supplementary insulation or the reinforced insulation.) e3 {! D# s2 E) T' }# `( [9 j, ~
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NOTE 3 If earthing is provided to assist starting, or for EMC reasons, but is not connected to an accessible metal9 b X8 l$ G ?' u$ G% L/ a$ {. h) E6 |
& k8 n1 S$ H( J0 ~/ S2 v$ upart, the luminaire may still be deemed to be of class II. Accessible metal parts in compliance with the appropriate; V3 r2 ], S0 b; Q2 R
/ m' \' J3 U/ JIEC lamp specification and other metal parts not normally earthed and not normally accessible during normal use6 i1 l$ t' ~( N
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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. O5 p8 M) `) j/ Z9 e2 i
8 P( G! c+ H# z! M' gto be live parts.9 ~7 b; v" P+ e2 n2 H" K/ n
3 a) O6 s3 M- N' H; A
NOTE 4 If a luminaire with double insulation and/or reinforced insulation throughout has a safety earthing terminal& D0 U2 m! t) w7 m4 q# Q h
8 P. q3 m# V* p; aor a safety earthing contact, it is class I construction. However, a fixed class II luminaire intended for looping-in or+ b0 C. J2 u: F1 T2 l
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provided with through wiring may have an internal terminal or contact for maintaining the electrical continuity of an
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' _. u' o- ^! J+ dearthing conductor not terminating in the luminaire, provided that the terminal is insulated from accessible metal
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parts by class II insulation.
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& [" e8 r w0 x ? K9 ^3 ]以上摘录自IEC60598-1:2008，Page 21。% n5 p/ J/ e$ \
0 J( q, D# j) p `/ b) N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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