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1.2.23/ X6 O1 `3 d: `
class II luminaire
9 @' K9 ]- L( s0 v- `luminaire in which protection against electric shock does not rely on basic insulation only, but in
1 z0 r; q$ H$ C" P' f1 R% X- ]which additional safety precautions such as double insulation or reinforced insulation are: z R9 ~' d3 {: N7 S9 b4 u
provided, there being no provision for protective earthing or reliance upon installation
$ Q* y4 l5 P, p0 ~ C3 C1 Z4 ]conditions.
4 N7 g- m1 _; m+ `( x* oNOTE 1 Such a luminaire may be of one of the following types:% e8 H# c3 s3 H
a) A luminaire having a durable and substantially continuous enclosure of insulating material which envelopes all3 b" M% N% ~+ s% u3 `. C
metal parts with the exception of small parts such as nameplates, screws and rivets which are isolated from live" b& c- Y# a% F
parts by insulation at least equivalent to reinforced insulation. Such a luminaire is called an insulation encased
: n+ W$ S! z, H, }0 A' w: |class II luminaire.7 {) K+ n+ y) e
b) A luminaire having a substantially continuous enclosure of metal, in which double insulation is used throughout,3 k; p' |: C6 o1 E O0 I6 c' F) ]
except for those parts where reinforced insulation is used because the application of double insulation is
& ]& F. i% K: I5 [5 _; o" y& imanifestly impracticable. Such a luminaire is called a metal-encased class II luminaire.
: ?% Q' U' X6 m) s3 }c) A luminaire which is a combination of types a) and b) above.7 m% B( g; F d, L2 ~) i" V
NOTE 2 The enclosure of an insulation-encased class II luminaire may form a part or the whole of the
- L; _' Q) ?4 U @1 Zsupplementary insulation or the reinforced insulation.
" S, u0 \: C) H& V7 T) hNOTE 3 If earthing is provided to assist starting, but is not connected to an accessible metal part, the luminaire
# o; y' W3 M! w1 |( \" W5 nmay still be deemed to be of class II. Accessible metal parts in compliance with the appropriate IEC lamp- d, B1 g9 B) z+ }
specification and other metal parts not normally earthed and not normally accessible during normal use are not& m: K5 Q, n4 A5 J# ?* t
regarded to be conductive parts which may cause an electric shock unless the tests of Annex A show them to be
: s( h* N/ f% {" T3 [live parts. U# p' H7 Q& R7 F: ] a
NOTE 4 If a luminaire with double insulation and/or reinforced insulation throughout has an earthing terminal or an, n# _5 r% ~7 T) L0 a
earthing contact, it is class I construction. However, a fixed class II luminaire intended for looping-in may have an9 z+ t% c* `1 n/ w
internal terminal for maintaining the electrical continuity of an earthing conductor not terminating in the luminaire,
5 c% f' a$ ~; _provided that the terminal is insulated from accessible metal parts by class II insulation.
8 Z( t- d$ q, }* JNOTE 5 Class II luminaires may have parts in which protection against electric shock relies on operation at safety
8 Q9 i3 ^* h) V( K2 ^) Hextra-low voltage (SELV).
- P2 t9 f% Z4 @# y' C) ~1.2.24
7 |2 G2 J( h1 u. k* @class III luminaire
8 |" m9 g: r3 R' hluminaire in which protection against electric shock relies on supply at safety extra-low voltage. w4 u6 J4 I, e p; n1 }5 D
(SELV) and in which voltages higher than those of SELV are not generated.
$ `/ l: f6 Y$ W$ G% {- z9 E/ B LNOTE A class III luminaire should not be provided with means for protective earthing. |
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发表于 2007-9-5 09:46
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