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1.2.234 M9 U( b! n/ ~/ T0 {
class II luminaire( l% o; ]: Y, a0 m
luminaire in which protection against electric shock does not rely on basic insulation only, but in
; [8 S2 o; P. A# m& z, Nwhich additional safety precautions such as double insulation or reinforced insulation are
) J$ O+ b0 Z& c0 I+ Eprovided, there being no provision for protective earthing or reliance upon installation
& T! m* u; c6 D' U. K+ x# Pconditions.4 h+ ?3 C% B! z3 N( V/ l
NOTE 1 Such a luminaire may be of one of the following types:5 `, I \ m5 g* W
a) A luminaire having a durable and substantially continuous enclosure of insulating material which envelopes all
) W% q P$ Z+ M/ I6 smetal parts with the exception of small parts such as nameplates, screws and rivets which are isolated from live. |/ f# [/ _1 h/ b0 \
parts by insulation at least equivalent to reinforced insulation. Such a luminaire is called an insulation encased+ u1 @4 p! {8 }+ Z. g$ y
class II luminaire.4 q7 Q+ N+ m) v
b) A luminaire having a substantially continuous enclosure of metal, in which double insulation is used throughout,- c( {; d8 k+ l( x8 R
except for those parts where reinforced insulation is used because the application of double insulation is5 H4 l" I, A) e4 e. I' X5 `1 {4 d$ e# e
manifestly impracticable. Such a luminaire is called a metal-encased class II luminaire.% P- K) ^' Y0 N) L D b
c) A luminaire which is a combination of types a) and b) above.6 Z1 R& `0 M; \
NOTE 2 The enclosure of an insulation-encased class II luminaire may form a part or the whole of the/ D; J ~+ A0 W% _
supplementary insulation or the reinforced insulation.7 s: F. x; T6 ^
NOTE 3 If earthing is provided to assist starting, but is not connected to an accessible metal part, the luminaire, ~1 u; Y4 C$ w5 Z/ ?! M
may still be deemed to be of class II. Accessible metal parts in compliance with the appropriate IEC lamp5 }' {& ?5 Z( v8 J0 q7 g/ C' h$ Z
specification and other metal parts not normally earthed and not normally accessible during normal use are not1 X$ Z* b* P/ H* S9 [* o1 Q
regarded to be conductive parts which may cause an electric shock unless the tests of Annex A show them to be' ^/ L$ G% p& n1 S6 x
live parts./ t) @2 E' f0 F5 A3 T
NOTE 4 If a luminaire with double insulation and/or reinforced insulation throughout has an earthing terminal or an$ F6 \) @. H# E9 ^: A
earthing contact, it is class I construction. However, a fixed class II luminaire intended for looping-in may have an
4 Z/ ]' F. t' Z+ Pinternal terminal for maintaining the electrical continuity of an earthing conductor not terminating in the luminaire,
/ J/ c3 _ G! Y5 R4 U6 l& Zprovided that the terminal is insulated from accessible metal parts by class II insulation.
) V: g- b" L+ v. _7 X! nNOTE 5 Class II luminaires may have parts in which protection against electric shock relies on operation at safety
W. d4 S9 G' u7 Q5 K. F$ B, Bextra-low voltage (SELV).
+ f" M! F" p7 n! o1.2.243 o+ @' f# F" P9 j q0 \* q
class III luminaire
6 p# M* S2 {5 V" ~luminaire in which protection against electric shock relies on supply at safety extra-low voltage, s6 h0 m4 _9 c
(SELV) and in which voltages higher than those of SELV are not generated. }- t8 j4 J9 d) t+ a5 G' }
NOTE A class III luminaire should not be provided with means for protective earthing. |
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