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1.2.23; e' W- o2 [0 k3 G* I( z6 ^
class II luminaire
$ H" V3 [7 w8 W' {" Cluminaire in which protection against electric shock does not rely on basic insulation only, but in
5 t$ l; x2 g+ S( i3 u# }- Qwhich additional safety precautions such as double insulation or reinforced insulation are
7 W+ A4 H$ i' E4 O- j p. gprovided, there being no provision for protective earthing or reliance upon installation
5 F8 Y" _% r) P6 \conditions. F. ?) y! C M- { ]( c9 H/ o
NOTE 1 Such a luminaire may be of one of the following types:' @1 F% h6 h8 |7 d5 s
a) A luminaire having a durable and substantially continuous enclosure of insulating material which envelopes all
/ z6 C) d1 G3 c% _. ametal parts with the exception of small parts such as nameplates, screws and rivets which are isolated from live) l* U* S0 Y' d3 Y, F
parts by insulation at least equivalent to reinforced insulation. Such a luminaire is called an insulation encased
. H* n+ e. z$ {9 ?0 F9 ~class II luminaire.
( l4 p4 t. N/ v0 Bb) A luminaire having a substantially continuous enclosure of metal, in which double insulation is used throughout,; k1 g# v# R! G' L9 n( ]% G6 S" o
except for those parts where reinforced insulation is used because the application of double insulation is& A0 `3 P- g9 c. X7 A% F6 i
manifestly impracticable. Such a luminaire is called a metal-encased class II luminaire.
0 J7 Y9 _( d. i4 D& r( Hc) A luminaire which is a combination of types a) and b) above.
: v' b& H: i$ z0 [ t, e& bNOTE 2 The enclosure of an insulation-encased class II luminaire may form a part or the whole of the
`# V4 K2 b5 c7 n2 jsupplementary insulation or the reinforced insulation.
( g0 W. }: I8 Y2 mNOTE 3 If earthing is provided to assist starting, but is not connected to an accessible metal part, the luminaire1 |7 J; _6 | b" v* q
may still be deemed to be of class II. Accessible metal parts in compliance with the appropriate IEC lamp' _2 h; X; d% C- o( x# q3 P: c
specification and other metal parts not normally earthed and not normally accessible during normal use are not
, V8 P) a) c0 C0 K# u. a {# S) vregarded to be conductive parts which may cause an electric shock unless the tests of Annex A show them to be) H1 Y/ r, ]$ u9 r# e; r; q8 U* l
live parts.
* K5 l& P4 g( m9 \/ f! F# qNOTE 4 If a luminaire with double insulation and/or reinforced insulation throughout has an earthing terminal or an
* t+ W' i. _) M- {* x; R& l; Vearthing contact, it is class I construction. However, a fixed class II luminaire intended for looping-in may have an/ Q n% r; ^8 V7 y3 B- e7 c- q: C
internal terminal for maintaining the electrical continuity of an earthing conductor not terminating in the luminaire,4 S6 m& r- |, A
provided that the terminal is insulated from accessible metal parts by class II insulation.: S$ u6 l; P. l+ e" }
NOTE 5 Class II luminaires may have parts in which protection against electric shock relies on operation at safety' Y- ?" }5 e- Y
extra-low voltage (SELV).
) i6 ]; Y4 V9 W+ a: c/ O1.2.24
% I# K: d+ P( B0 U! ~class III luminaire" i; i/ f/ V9 K/ B9 C% ~; U
luminaire in which protection against electric shock relies on supply at safety extra-low voltage
& p* T& T) I* |! o(SELV) and in which voltages higher than those of SELV are not generated.
% G y7 H% u! d% m' `7 f) Z) SNOTE A class III luminaire should not be provided with means for protective earthing. |
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