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1.2.23( p/ W" n4 E- L# o0 w1 R7 D3 C
class II luminaire
O' }, x1 a1 r1 yluminaire in which protection against electric shock does not rely on basic insulation only, but in" z9 O- G T' O# M
which additional safety precautions such as double insulation or reinforced insulation are# e0 e% o9 t: u' ~& j* ]
provided, there being no provision for protective earthing or reliance upon installation7 `# p# g S' y- M- |' I F
conditions.& e7 L4 [, m% {# i4 r* X, K7 K
NOTE 1 Such a luminaire may be of one of the following types:
, k, c4 h D' f( Oa) A luminaire having a durable and substantially continuous enclosure of insulating material which envelopes all
! {/ H- F3 m" gmetal parts with the exception of small parts such as nameplates, screws and rivets which are isolated from live8 C' _5 R, R$ p
parts by insulation at least equivalent to reinforced insulation. Such a luminaire is called an insulation encased
2 X- K% K) \7 ~' aclass II luminaire.- B" `) x3 |6 X% s. F
b) A luminaire having a substantially continuous enclosure of metal, in which double insulation is used throughout,9 ~; |1 J3 B# R$ V; x* Q( ]
except for those parts where reinforced insulation is used because the application of double insulation is
& _: }4 P/ i" u9 m6 n% Ymanifestly impracticable. Such a luminaire is called a metal-encased class II luminaire.
5 u: M/ Z9 t( b- |3 k1 x6 q: xc) A luminaire which is a combination of types a) and b) above.
# \$ @3 N; _7 Q2 t8 ?& [1 {NOTE 2 The enclosure of an insulation-encased class II luminaire may form a part or the whole of the+ o5 f. o5 N) t5 u
supplementary insulation or the reinforced insulation.
5 G. z" j% \& K$ L( o4 N5 U: TNOTE 3 If earthing is provided to assist starting, but is not connected to an accessible metal part, the luminaire. S- D1 W C3 O; I; i7 m8 h
may still be deemed to be of class II. Accessible metal parts in compliance with the appropriate IEC lamp/ Y! E$ m+ p8 e! e7 `
specification and other metal parts not normally earthed and not normally accessible during normal use are not
( ]" r; v( x- _/ cregarded to be conductive parts which may cause an electric shock unless the tests of Annex A show them to be
5 F: c. p: x+ T; ~+ O; Elive parts.) U2 \ q$ z0 d2 h/ ]
NOTE 4 If a luminaire with double insulation and/or reinforced insulation throughout has an earthing terminal or an
( c- g& F5 k0 L) O2 Qearthing contact, it is class I construction. However, a fixed class II luminaire intended for looping-in may have an
* ^: K- [4 v5 g* c' m3 Binternal terminal for maintaining the electrical continuity of an earthing conductor not terminating in the luminaire,. P) O. v( Y( `% b5 D
provided that the terminal is insulated from accessible metal parts by class II insulation.
& V( ^ [3 K: H) b7 vNOTE 5 Class II luminaires may have parts in which protection against electric shock relies on operation at safety
9 o+ G/ @' J% f; }extra-low voltage (SELV).
+ R( s" p+ v5 G5 y. ?1.2.24" l3 ?5 w0 M, z& d ?5 c: O' K. P
class III luminaire5 l5 X9 I4 }8 v
luminaire in which protection against electric shock relies on supply at safety extra-low voltage
7 ]' @$ h/ P0 G6 \; ^, f(SELV) and in which voltages higher than those of SELV are not generated.- r: o( N7 E+ k7 o
NOTE 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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