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1.2.23. m: F0 R, ^5 q$ p
class II luminaire# {8 g: r7 E4 a# d
luminaire in which protection against electric shock does not rely on basic insulation only, but in0 M1 C2 v. z3 Z/ D8 r) } g( @
which additional safety precautions such as double insulation or reinforced insulation are' `( A; S1 o5 G _( t
provided, there being no provision for protective earthing or reliance upon installation
1 s5 l/ P" H/ s$ n! tconditions.
8 ]' s% T! J- N( YNOTE 1 Such a luminaire may be of one of the following types:
, r9 \% X3 V; M7 W$ na) A luminaire having a durable and substantially continuous enclosure of insulating material which envelopes all
6 J, J6 v2 z5 V9 d) T& _) Q$ v7 vmetal parts with the exception of small parts such as nameplates, screws and rivets which are isolated from live
- c& C$ j& U( B/ N6 Rparts by insulation at least equivalent to reinforced insulation. Such a luminaire is called an insulation encased
+ z4 M8 c. x; `5 m+ Jclass II luminaire.9 n4 M+ |6 M: R5 F2 h: G5 P
b) A luminaire having a substantially continuous enclosure of metal, in which double insulation is used throughout,2 X2 i J7 h5 L2 @* S
except for those parts where reinforced insulation is used because the application of double insulation is
3 B0 G5 L+ I1 Q9 I; O" |manifestly impracticable. Such a luminaire is called a metal-encased class II luminaire.6 m) z' r1 }) b+ ^; v
c) A luminaire which is a combination of types a) and b) above.) |7 v( [% U/ s% i- H8 u
NOTE 2 The enclosure of an insulation-encased class II luminaire may form a part or the whole of the
+ x {2 L! S- [$ O* }( {6 Fsupplementary insulation or the reinforced insulation.
7 ^) M C9 Y4 t" l% F3 fNOTE 3 If earthing is provided to assist starting, but is not connected to an accessible metal part, the luminaire
" L: i- c: X& G( ^! e* k" h3 Hmay still be deemed to be of class II. Accessible metal parts in compliance with the appropriate IEC lamp
! W8 _( _; x \7 _6 f! u; Lspecification and other metal parts not normally earthed and not normally accessible during normal use are not& E5 I. z' B( `6 g6 n! O
regarded to be conductive parts which may cause an electric shock unless the tests of Annex A show them to be2 V3 u D* m) n* J
live parts.3 m% q: U0 G" C
NOTE 4 If a luminaire with double insulation and/or reinforced insulation throughout has an earthing terminal or an
1 V' C, E+ d1 l/ @9 Tearthing contact, it is class I construction. However, a fixed class II luminaire intended for looping-in may have an. M; a1 g% V' z5 I$ M$ A
internal terminal for maintaining the electrical continuity of an earthing conductor not terminating in the luminaire,5 S8 P! u* E* n* v5 Z5 b" o" n
provided that the terminal is insulated from accessible metal parts by class II insulation.
; O7 K5 n$ R8 V5 uNOTE 5 Class II luminaires may have parts in which protection against electric shock relies on operation at safety
: t2 ?' i8 X2 S/ w6 z3 g6 K7 lextra-low voltage (SELV).
. S6 i# m6 J! L8 R9 l1.2.246 } W+ S3 f5 `2 R
class III luminaire
8 [) u; j# H7 q, iluminaire in which protection against electric shock relies on supply at safety extra-low voltage, R/ c' e1 I+ b; W) @$ s
(SELV) and in which voltages higher than those of SELV are not generated.
* ~4 q5 g$ i3 r0 O. b+ cNOTE A class III luminaire should not be provided with means for protective earthing. |
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发表于 2007-9-5 09:57
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