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1.2.23. @# }8 ?4 T' Y# H
class II luminaire) H. `$ l2 }( o4 R/ [
luminaire in which protection against electric shock does not rely on basic insulation only, but in
1 F6 T1 |$ i) L/ x/ e- ewhich additional safety precautions such as double insulation or reinforced insulation are+ O+ U' e( d: q6 M2 w( C2 }
provided, there being no provision for protective earthing or reliance upon installation
% Z# W9 E* B, P3 v% mconditions.% V& ~7 V( b, W: O4 E
NOTE 1 Such a luminaire may be of one of the following types:
; N# P! E+ u5 c1 p* wa) A luminaire having a durable and substantially continuous enclosure of insulating material which envelopes all
; U- o. u2 }% a0 C Ometal parts with the exception of small parts such as nameplates, screws and rivets which are isolated from live
; c! ?8 x% h3 |0 Y* z1 v( vparts by insulation at least equivalent to reinforced insulation. Such a luminaire is called an insulation encased
. @* t$ a$ v& `8 i+ B, g" Uclass II luminaire.
( ~7 q- I/ g9 T U! gb) A luminaire having a substantially continuous enclosure of metal, in which double insulation is used throughout,
' `5 e, D1 \. z. q sexcept for those parts where reinforced insulation is used because the application of double insulation is9 Q6 V* C* c/ c/ l+ g2 g, p/ E4 G
manifestly impracticable. Such a luminaire is called a metal-encased class II luminaire.9 C) d5 H x. i. `
c) A luminaire which is a combination of types a) and b) above., R% d3 f% [+ K* {3 M' N9 ^
NOTE 2 The enclosure of an insulation-encased class II luminaire may form a part or the whole of the! G2 z( s, v% x% v8 S
supplementary insulation or the reinforced insulation.
. a; I; }' r4 ?3 Y' A* m% kNOTE 3 If earthing is provided to assist starting, but is not connected to an accessible metal part, the luminaire
8 W7 ~* c. ^1 M6 j' wmay still be deemed to be of class II. Accessible metal parts in compliance with the appropriate IEC lamp+ i( T! F3 n. {! j {2 f
specification and other metal parts not normally earthed and not normally accessible during normal use are not3 K3 t( V0 x) S; L k8 H5 f( ^
regarded to be conductive parts which may cause an electric shock unless the tests of Annex A show them to be$ P8 u9 v! J! q- M6 Y4 G( v( g
live parts.
4 n# p- b' k: h0 e# Q$ M6 }- VNOTE 4 If a luminaire with double insulation and/or reinforced insulation throughout has an earthing terminal or an
( @% K3 [1 K0 U- }; j3 ]/ yearthing contact, it is class I construction. However, a fixed class II luminaire intended for looping-in may have an
0 D8 v; I- t9 h9 l. _; binternal terminal for maintaining the electrical continuity of an earthing conductor not terminating in the luminaire,- G6 s3 T' j/ q. y, f, d' ]
provided that the terminal is insulated from accessible metal parts by class II insulation.
/ b/ L/ x8 b ]! N$ ~& sNOTE 5 Class II luminaires may have parts in which protection against electric shock relies on operation at safety
% d7 _) O! K* u6 k# _! @$ Wextra-low voltage (SELV).
9 L6 ^# X$ o* Z* R% K) {& ]8 V1.2.244 x0 s$ {* ]+ f* ~; m
class III luminaire3 [/ J. ^7 k* m. m* D* L% e
luminaire in which protection against electric shock relies on supply at safety extra-low voltage
- S- I4 ^6 l' D2 N6 e0 m* W(SELV) and in which voltages higher than those of SELV are not generated.* {6 A( f7 G9 @# \" N
NOTE A class III luminaire should not be provided with means for protective earthing. |
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