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1.2.23
% P4 U( j# W( Y9 gclass II luminaire
0 K$ B5 g9 u% b) m6 G' Oluminaire in which protection against electric shock does not rely on basic insulation only, but in m) | X7 l3 P# n* X! a$ t) T/ v) k* ~
which additional safety precautions such as double insulation or reinforced insulation are
f/ n! _' m0 g; W9 w4 E& L. Eprovided, there being no provision for protective earthing or reliance upon installation! `; h5 K# s8 S
conditions.
+ i/ U: |7 f! J; R0 fNOTE 1 Such a luminaire may be of one of the following types:0 _$ y* @" U- N
a) A luminaire having a durable and substantially continuous enclosure of insulating material which envelopes all
( p% y7 k6 X$ J: Q1 u2 Pmetal parts with the exception of small parts such as nameplates, screws and rivets which are isolated from live2 M, ?/ X3 D4 O
parts by insulation at least equivalent to reinforced insulation. Such a luminaire is called an insulation encased
! C3 a! L) a/ H# g9 E, gclass II luminaire.
: L! A4 l: s( Y4 r$ y( a* }b) A luminaire having a substantially continuous enclosure of metal, in which double insulation is used throughout,
3 n$ c5 {7 V7 v7 K6 ^& o9 C# Yexcept for those parts where reinforced insulation is used because the application of double insulation is# O" g: m+ q, S3 A& ?
manifestly impracticable. Such a luminaire is called a metal-encased class II luminaire.
5 j+ V) C& e$ Ec) A luminaire which is a combination of types a) and b) above.
- V3 s& ]8 Y5 Z U* W2 R( aNOTE 2 The enclosure of an insulation-encased class II luminaire may form a part or the whole of the; w" C. U; ^8 n; W
supplementary insulation or the reinforced insulation.
: x2 B3 U/ f( [3 G" LNOTE 3 If earthing is provided to assist starting, but is not connected to an accessible metal part, the luminaire; Q) @. N4 E U6 v3 N3 k
may still be deemed to be of class II. Accessible metal parts in compliance with the appropriate IEC lamp" G$ T- y$ @6 p4 D9 \) \4 a
specification and other metal parts not normally earthed and not normally accessible during normal use are not6 n0 }6 v% ~, G8 j( @
regarded to be conductive parts which may cause an electric shock unless the tests of Annex A show them to be- @$ l7 P0 ?# d. G; N4 o# F2 s
live parts.
$ Q. {. t) F5 M. S4 W* UNOTE 4 If a luminaire with double insulation and/or reinforced insulation throughout has an earthing terminal or an, T5 f/ H! k' T4 K2 B
earthing contact, it is class I construction. However, a fixed class II luminaire intended for looping-in may have an5 p" ?; I* M( {8 Z$ ~: U
internal terminal for maintaining the electrical continuity of an earthing conductor not terminating in the luminaire,3 {6 X0 x; N6 s2 a; T) Q: Y
provided that the terminal is insulated from accessible metal parts by class II insulation.
& ~+ W, ?! {6 A4 n6 ?NOTE 5 Class II luminaires may have parts in which protection against electric shock relies on operation at safety
T% Z7 o- H3 F' eextra-low voltage (SELV).* Q7 W2 H$ g( [3 O4 c3 [6 V
1.2.243 S& e V+ e1 b( W) b1 J9 {
class III luminaire' p- x& [, ?" _
luminaire in which protection against electric shock relies on supply at safety extra-low voltage* ^7 ~4 W6 ]* p+ B8 A, H
(SELV) and in which voltages higher than those of SELV are not generated./ G4 E; O' G @3 `9 B% M
NOTE A class III luminaire should not be provided with means for protective earthing. |
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