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3.3.10
8 [: `: o# h/ `, |( bclass II appliance
7 M9 I' w* g6 j* x1 A) _" q# tappliance in which protection against electric shock does not rely on basic insulation only
- O' L3 e. k2 jbut in which additional safety precautions are provided, such as double insulation or' ?( x) S( F/ x
reinforced insulation, there being no provision for protective earthing or reliance upon4 E" C% B8 C0 H4 |) b- K
installation conditions
" i; K- G: `% I* c/ @" cNOTE 1 Such an appliance may be of one of the following types:1 m/ L$ y: W j% i
– an appliance having a durable and substantially continuous enclosure of insulating material which envelops all
& B% G- z1 Y: wmetal parts, with the exception of parts, such as nameplates, screws and rivets, which are isolated from live3 L2 ^1 u# X5 D4 u! a. s
parts by insulation at least equivalent to reinforced insulation; such an appliance is called an insulationencased
. ~2 d- S4 z0 Q( p, g) Bclass II appliance;
9 R3 B- i$ n$ D, I' ]– an appliance having a substantially continuous metal enclosure, in which double insulation or reinforced7 p; o. t' {: F/ V9 N! A/ O
insulation is used throughout; such an appliance is called a metal-encased class II appliance;
& t2 k+ C( D7 h+ F8 Y4 J– an appliance which is a combination of an insulation-encased class II appliance and a metal-encased class II
5 S) `. n1 v) \: H% _1 G/ Vappliance.
; L7 F% {, ] h; A9 iNOTE 2 The enclosure of an insulation-encased class II appliance may form a part or the whole of the" f- v5 }& N: D9 H) p- [, T, z
supplementary insulation or of the reinforced insulation.
6 {! L' H# a; iNOTE 3 If an appliance with double insulation or reinforced insulation throughout has provision for earthing, it7 t7 D: s H1 i
is considered to be a class I appliance or a class 0I appliance. |
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