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1.2.237 D; I! \$ U$ s* N: \; ^6 Q- V6 l+ |# ]
class II luminaire" ^# o3 M! y9 H: L2 j$ d/ L# i& x
luminaire in which protection against electric shock does not rely on basic insulation only, but in1 l' i4 L- l s3 n
which additional safety precautions such as double insulation or reinforced insulation are `; s0 X5 M% V( F0 n( m; F
provided, there being no provision for protective earthing or reliance upon installation9 k2 y4 i2 w2 {
conditions.
$ u9 ^" z; }" x( pNOTE 1 Such a luminaire may be of one of the following types:
5 ^5 g6 _ `& Y) e0 K/ o) Ta) A luminaire having a durable and substantially continuous enclosure of insulating material which envelopes all
" g+ ?- `5 c; _ D g, |metal parts with the exception of small parts such as nameplates, screws and rivets which are isolated from live
; u9 z3 T3 i6 J! S" tparts by insulation at least equivalent to reinforced insulation. Such a luminaire is called an insulation encased$ E9 ^( m6 Q6 W8 B8 G; _0 @7 j
class II luminaire.
9 I8 A) \8 s/ d/ tb) A luminaire having a substantially continuous enclosure of metal, in which double insulation is used throughout,
# S2 C3 K: q g5 o8 y- Kexcept for those parts where reinforced insulation is used because the application of double insulation is3 Q' B. D6 {& j; n6 Z, y
manifestly impracticable. Such a luminaire is called a metal-encased class II luminaire.. x) }0 R( c \# L
c) A luminaire which is a combination of types a) and b) above.# \: K. I" y' o3 z
NOTE 2 The enclosure of an insulation-encased class II luminaire may form a part or the whole of the4 ?7 N( B, b% R1 |
supplementary insulation or the reinforced insulation./ E1 i( r- M9 ~$ S) x
NOTE 3 If earthing is provided to assist starting, but is not connected to an accessible metal part, the luminaire0 D5 Z, d9 q; e0 u3 f5 s& b# H. _2 Y
may still be deemed to be of class II. Accessible metal parts in compliance with the appropriate IEC lamp1 l7 i: y# R6 B- d7 ^2 f% h
specification and other metal parts not normally earthed and not normally accessible during normal use are not
7 Q2 ]" a: r9 z+ s3 {" jregarded to be conductive parts which may cause an electric shock unless the tests of Annex A show them to be; y2 q: v0 s% Z1 S' P; }0 e- V' m
live parts.3 _6 r; w1 n# b- y
NOTE 4 If a luminaire with double insulation and/or reinforced insulation throughout has an earthing terminal or an, T3 K* \& ]' V- X
earthing contact, it is class I construction. However, a fixed class II luminaire intended for looping-in may have an
$ t, Q0 D2 O: U/ winternal terminal for maintaining the electrical continuity of an earthing conductor not terminating in the luminaire,) O' Z U' g( M! y2 O
provided that the terminal is insulated from accessible metal parts by class II insulation." d- Y& m8 Z5 d/ ^: e E
NOTE 5 Class II luminaires may have parts in which protection against electric shock relies on operation at safety3 y# P, Z0 H9 x
extra-low voltage (SELV).% |4 b1 v( t! ~ t/ D0 ^% |
1.2.24
0 T; x4 y+ N0 ~3 l; k( ~class III luminaire% D3 a$ ?5 Q) P8 s0 s
luminaire in which protection against electric shock relies on supply at safety extra-low voltage; e$ [- d+ k8 ^9 i
(SELV) and in which voltages higher than those of SELV are not generated.
8 o5 }7 ~1 Z3 C1 j1 N/ \NOTE A class III luminaire should not be provided with means for protective earthing. |
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