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1.2.23
/ n2 |4 Z& O2 I% u. Yclass II luminaire0 }' _$ e9 H2 Y3 W
luminaire in which protection against electric shock does not rely on basic insulation only, but in9 X4 d9 n5 O; \, K: b
which additional safety precautions such as double insulation or reinforced insulation are
; J( U' m5 z0 {& C A0 ~# aprovided, there being no provision for protective earthing or reliance upon installation
3 ?+ ]1 J, J0 Y* [4 Tconditions.
" R y$ U3 l. _1 ^2 N0 C/ [: v8 p' o. KNOTE 1 Such a luminaire may be of one of the following types:
) J" x4 g& ^# d' G( ?a) A luminaire having a durable and substantially continuous enclosure of insulating material which envelopes all/ h% Y/ H3 E2 U/ J) K
metal parts with the exception of small parts such as nameplates, screws and rivets which are isolated from live9 `! L# p7 D- i! M
parts by insulation at least equivalent to reinforced insulation. Such a luminaire is called an insulation encased
4 q# I3 L6 u' i! c0 b; Bclass II luminaire.
5 w* S; i/ s* cb) A luminaire having a substantially continuous enclosure of metal, in which double insulation is used throughout,7 ]: C- ^% _( {3 c# }9 x+ u$ K
except for those parts where reinforced insulation is used because the application of double insulation is
( Z' w9 P! C+ Y3 F! |$ }manifestly impracticable. Such a luminaire is called a metal-encased class II luminaire.% O, N+ E0 i- L5 d
c) A luminaire which is a combination of types a) and b) above.
0 J/ F/ r) W0 E$ I; o+ V: JNOTE 2 The enclosure of an insulation-encased class II luminaire may form a part or the whole of the
. X1 v6 v# A0 y4 ?/ Z' ~3 ?5 isupplementary insulation or the reinforced insulation." q3 G& p3 q4 q1 ^' I. M
NOTE 3 If earthing is provided to assist starting, but is not connected to an accessible metal part, the luminaire3 Y2 C ^2 \, \, u( l) M
may still be deemed to be of class II. Accessible metal parts in compliance with the appropriate IEC lamp
3 L3 c' q- _+ H) n i$ ~ Hspecification and other metal parts not normally earthed and not normally accessible during normal use are not7 o- C& y x/ c; v8 H' y% R
regarded to be conductive parts which may cause an electric shock unless the tests of Annex A show them to be$ X @% _9 e$ _7 M
live parts./ r- T, l; y! q' S% ]8 w! o7 p
NOTE 4 If a luminaire with double insulation and/or reinforced insulation throughout has an earthing terminal or an- U' u* R" h/ g% v V$ d) `; K
earthing contact, it is class I construction. However, a fixed class II luminaire intended for looping-in may have an
9 A$ Z$ h M6 r/ ]internal terminal for maintaining the electrical continuity of an earthing conductor not terminating in the luminaire,+ `1 u! X6 W @7 Y4 x4 g
provided that the terminal is insulated from accessible metal parts by class II insulation.5 `3 H; i+ A B: S3 Z' k
NOTE 5 Class II luminaires may have parts in which protection against electric shock relies on operation at safety- \( A% i, @( K: Q4 R
extra-low voltage (SELV).
4 F9 v7 s& w# d5 _! ^% R" r1.2.24
! R) s+ g. f' b `class III luminaire
' Q0 y: n7 T4 D0 dluminaire in which protection against electric shock relies on supply at safety extra-low voltage
' q1 f. Q, ~% F, D& `% N( Y(SELV) and in which voltages higher than those of SELV are not generated.0 X7 L1 W$ L1 i
NOTE A class III luminaire should not be provided with means for protective earthing. |
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