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1.2.23
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class II luminaire
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luminaire in which protection against electric shock does not rely on basic insulation only, but in- Q. t: f+ b, R1 D4 ]6 ~4 H
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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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6 Z& l! f* b" v0 I4 Kconditions
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% k' d% i- Y: N0 ~6 nNOTE 1 Such a luminaire may be of one of the following types:0 ?* g: w6 c9 b0 a9 W6 Q
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a) A luminaire having a durable and substantially continuous enclosure of insulating material which envelopes all( o/ v7 E3 b1 C$ }
: X9 L' A# M: M& J. M* k& {metal parts with the exception of small parts such as nameplates, screws and rivets which are isolated from live
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R4 {3 Z7 z2 ] xparts by insulation at least equivalent to reinforced insulation. Such a luminaire is called an insulation encased
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5 L ]6 L) O" z4 C+ Lclass II luminaire.
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( z( ~' B) |& @8 R$ Ib) A luminaire having a substantially continuous enclosure of metal, insulated from live parts by insulation at least( r" k3 K+ L' P+ Q
+ j8 t! N. L6 E' h' R8 sequivalent to double or reinforced insulation. Such a luminaire is called a metal-encased class II luminaire.! j) T1 X }- [7 a6 M
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c) A luminaire which is a combination of types a) and b) above./ x n" W# z3 J3 V$ Z/ M6 ?6 C
/ w' ^( B) w3 P6 c) Y wNOTE 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.
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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 ?$ R: z. [* z: T6 g) Y
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part, the luminaire may still be deemed to be of class II. Accessible metal parts in compliance with the appropriate+ R5 J/ [8 G, W( ^8 x9 V! `) W
: v% V4 J$ p' Y( R5 p3 v+ fIEC lamp specification and other metal parts not normally earthed and not normally accessible during normal use9 @% o1 F+ g$ R0 _. E9 q1 E9 R
2 Y4 U7 D0 ~: l/ J2 Aare not regarded to be conductive parts which may cause an electric shock unless the tests of Annex A show them Q' Q8 ^; y" B
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to be live parts.+ F; Q) W5 ^8 O9 N8 C
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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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* Z, \( B E. |# ^or a safety earthing contact, it is class I construction. However, a fixed class II luminaire intended for looping-in or/ H/ T' Y; ~0 Q2 T# N
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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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earthing conductor not terminating in the luminaire, provided that the terminal is insulated from accessible metal1 i/ I9 L3 i0 \* e2 ]
6 h4 D3 e( X v2 Iparts by class II insulation.6 o* R1 w! f! d; @
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以上摘录自IEC60598-1:2008，Page 21。
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: `4 b4 X) m- d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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