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1.2.23
3 i7 S' ^1 ]( f2 C3 W5 h; g7 y! k, a, v: ~/ O) i
class II luminaire# ?4 P* g7 Y! y7 S8 j
- i. _ }" w$ d9 L" t4 nluminaire in which protection against electric shock does not rely on basic insulation only, but in
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6 S- I" u+ P% V0 f0 x O% M/ awhich additional safety precautions such as double insulation or reinforced insulation are
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; j7 `# {: {1 p0 R& z' n9 dprovided, 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:( A% u ?7 d( X9 p5 D
$ Q: J7 O- y" }) ca) A luminaire having a durable and substantially continuous enclosure of insulating material which envelopes all% e4 E$ r6 M6 m2 J" \* Q
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metal parts with the exception of small parts such as nameplates, screws and rivets which are isolated from live; v. g8 U$ ]3 o8 I9 t
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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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7 h- `' t2 i% nclass II luminaire.1 [% g* R, y5 X$ ^
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b) A luminaire having a substantially continuous enclosure of metal, insulated from live parts by insulation at least2 s7 F, M6 K) M/ t6 Q
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equivalent to double or reinforced insulation. Such a luminaire is called a metal-encased class II luminaire.
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6 j8 V: W2 w( L- J& I6 Y0 gc) A luminaire which is a combination of types a) and b) above.) H& q) e/ y9 b' l
% K. L! ^- D/ d+ Q3 Y! D/ I: zNOTE 2 The enclosure of an insulation-encased class II luminaire may form a part or the whole of the9 Y) W+ o: P4 d7 }
' h" v& x- p2 j# L3 U+ K. s" Y0 Lsupplementary insulation or the reinforced insulation.5 @+ D, b, b+ o3 K; o, @0 H
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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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: M3 \$ ]6 g" a1 a- U: ~part, the luminaire may still be deemed to be of class II. Accessible metal parts in compliance with the appropriate
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9 O' D; {5 x0 l6 \6 pIEC lamp specification and other metal parts not normally earthed and not normally accessible during normal use
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, b& e1 j$ Z6 Hare not regarded to be conductive parts which may cause an electric shock unless the tests of Annex A show them2 N1 z4 f# Q) x/ B$ C6 V
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to be live parts., S% ?0 K- S- l. M2 k1 V
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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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4 B* I/ W- E; Q2 y: i# oor a safety earthing contact, it is class I construction. However, a fixed class II luminaire intended for looping-in or) j: Q/ N m) x; a- A6 `. F
) B3 w* B+ f7 C' Jprovided with through wiring may have an internal terminal or contact for maintaining the electrical continuity of an
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( k" T0 l; ^9 S4 k1 q8 x! Nearthing 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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以上摘录自IEC60598-1:2008，Page 21。5 C9 K- M7 h) B
O4 ]7 I* [' m6 O- l. j0 d; C9 ~: h$ W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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