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1.2.23
; p4 v0 f1 o) y+ V3 g5 ~class II luminaire2 ?8 \: w5 T, t/ c
luminaire in which protection against electric shock does not rely on basic insulation only, but in- c I& E/ m3 P/ c/ x
which additional safety precautions such as double insulation or reinforced insulation are
/ D0 }- U( l: X4 I0 n S7 Cprovided, there being no provision for protective earthing or reliance upon installation
5 Z: I$ u( S% O* Xconditions.; ~. v1 J" ]" `. D$ O" S9 L( `
NOTE 1 Such a luminaire may be of one of the following types:
: V& z+ h+ x5 G ]1 m0 a, ea) A luminaire having a durable and substantially continuous enclosure of insulating material which envelopes all9 ]+ ?- m7 j, g- T. G0 }
metal parts with the exception of small parts such as nameplates, screws and rivets which are isolated from live/ Q+ v/ @2 d. D6 H5 b4 e( y+ T( ]
parts by insulation at least equivalent to reinforced insulation. Such a luminaire is called an insulation encased
0 Y( [2 h9 R8 z$ z( x+ Nclass II luminaire.! a9 H' C L, ]# q$ z: p* s }' J
b) A luminaire having a substantially continuous enclosure of metal, in which double insulation is used throughout,' k x2 {- K( Z v4 T0 f$ {
except for those parts where reinforced insulation is used because the application of double insulation is. X5 K. E) J: s: N% N. n
manifestly impracticable. Such a luminaire is called a metal-encased class II luminaire.6 B9 `9 q+ y5 z4 m0 D
c) A luminaire which is a combination of types a) and b) above.9 B/ ?3 a8 M- z4 D0 C; I
NOTE 2 The enclosure of an insulation-encased class II luminaire may form a part or the whole of the
4 F% M. {4 K2 j& zsupplementary insulation or the reinforced insulation.& N2 f- B2 T) g
NOTE 3 If earthing is provided to assist starting, but is not connected to an accessible metal part, the luminaire0 b% n9 D2 y# `# \/ a3 R
may still be deemed to be of class II. Accessible metal parts in compliance with the appropriate IEC lamp# B8 T0 y9 l$ p& d" ?' j) S
specification and other metal parts not normally earthed and not normally accessible during normal use are not1 ~0 w; D; p' g" T8 P( F( S
regarded to be conductive parts which may cause an electric shock unless the tests of Annex A show them to be
. ?2 `5 [3 I* tlive parts.+ ]2 T: e6 U% W0 `8 A% A2 E
NOTE 4 If a luminaire with double insulation and/or reinforced insulation throughout has an earthing terminal or an# m3 c' k7 X- i: ?3 P2 q5 x
earthing contact, it is class I construction. However, a fixed class II luminaire intended for looping-in may have an
% i' D* G8 {7 b( r& t5 m7 y! Yinternal terminal for maintaining the electrical continuity of an earthing conductor not terminating in the luminaire,; f: Q; R* M5 ]7 k- s r$ e% H" e7 C; \
provided that the terminal is insulated from accessible metal parts by class II insulation.( h! s7 s6 X0 v4 R9 v9 D
NOTE 5 Class II luminaires may have parts in which protection against electric shock relies on operation at safety
6 `6 F& q' C: S( ?5 m( K- g# L% |extra-low voltage (SELV).' |3 F" ~+ P A
1.2.24
* @1 D/ W! N1 s' gclass III luminaire0 d' ~9 F5 ?+ p$ p
luminaire in which protection against electric shock relies on supply at safety extra-low voltage
6 r9 Y, v) f7 v) ?, R' @; [4 E(SELV) and in which voltages higher than those of SELV are not generated.; |9 B: t# y t; E* ?
NOTE A class III luminaire should not be provided with means for protective earthing. |
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