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1.2.23" u. A) M! ]; m' t2 D" M
class II luminaire
' j, n" r: q/ X) B: Zluminaire in which protection against electric shock does not rely on basic insulation only, but in7 g- j* Q' L( `$ {$ b" u( L4 _, c5 x
which additional safety precautions such as double insulation or reinforced insulation are+ Z: h2 ]/ D- t- R
provided, there being no provision for protective earthing or reliance upon installation
% Z7 f; l9 S& |+ c) Xconditions.
, b6 X0 Q9 x7 T) f* P+ X2 S; jNOTE 1 Such a luminaire may be of one of the following types:
* t9 Z; r3 H0 e" Ca) A luminaire having a durable and substantially continuous enclosure of insulating material which envelopes all* L1 n* s# [8 X5 y; T# x
metal parts with the exception of small parts such as nameplates, screws and rivets which are isolated from live# M" k, ~8 n; k2 \
parts by insulation at least equivalent to reinforced insulation. Such a luminaire is called an insulation encased
; Q. \4 f6 b" l6 b+ Y$ ?2 A/ eclass II luminaire.' E; E/ i6 T% t5 ]8 v" K
b) A luminaire having a substantially continuous enclosure of metal, in which double insulation is used throughout,% {! G; I' l8 h8 t* g
except for those parts where reinforced insulation is used because the application of double insulation is" O! N5 V* ?3 @$ H( q$ k
manifestly impracticable. Such a luminaire is called a metal-encased class II luminaire.
/ L) Q/ s+ ?: {* ?5 q6 o$ }9 L: _c) A luminaire which is a combination of types a) and b) above.* E6 i4 r% n' {# R, E+ o# Q" w
NOTE 2 The enclosure of an insulation-encased class II luminaire may form a part or the whole of the2 U% m+ u1 y" W) x7 w1 n
supplementary insulation or the reinforced insulation." S& C5 ?' n" Q \) \, g$ u
NOTE 3 If earthing is provided to assist starting, but is not connected to an accessible metal part, the luminaire
" R8 K5 L9 `# j' C- j1 E9 Fmay still be deemed to be of class II. Accessible metal parts in compliance with the appropriate IEC lamp
0 o2 [! q: j8 i! P$ ]+ n) S) @specification and other metal parts not normally earthed and not normally accessible during normal use are not
+ @, N [8 i {0 vregarded to be conductive parts which may cause an electric shock unless the tests of Annex A show them to be2 i, p0 L. B+ d3 x3 R0 Q0 c. s
live parts.& q/ _, u9 d# {: u k% G
NOTE 4 If a luminaire with double insulation and/or reinforced insulation throughout has an earthing terminal or an6 s% \8 c+ W" m( k" ]( }
earthing contact, it is class I construction. However, a fixed class II luminaire intended for looping-in may have an
; s, H, d" e$ S7 v9 J+ i. N7 ointernal terminal for maintaining the electrical continuity of an earthing conductor not terminating in the luminaire,
) u Y( L( [; B1 B' G9 zprovided that the terminal is insulated from accessible metal parts by class II insulation.6 t3 f6 x; o6 ^4 i1 u$ _
NOTE 5 Class II luminaires may have parts in which protection against electric shock relies on operation at safety
* a( ?2 j. R& J/ z; q yextra-low voltage (SELV).
. r$ `7 k! D/ ~& t, Q1.2.24
' D6 b* o3 X+ z5 x1 M( Kclass III luminaire
. L' M5 T! b7 F4 D% qluminaire in which protection against electric shock relies on supply at safety extra-low voltage. x$ Y1 g8 \$ n9 K& _
(SELV) and in which voltages higher than those of SELV are not generated.
3 g# b5 J6 @" |2 A( l- } D' U% h6 \NOTE A class III luminaire should not be provided with means for protective earthing. |
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