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3.3.10
# D' E1 m3 t% G( t3 S% oclass II appliance
, A) l, B) Q% H, e" G6 Aappliance in which protection against electric shock does not rely on basic insulation only
( R$ u. ]3 M: Sbut in which additional safety precautions are provided, such as double insulation or" `% N/ Z9 G2 `/ A; { b
reinforced insulation, there being no provision for protective earthing or reliance upon
+ @! c5 ~, P/ h5 }installation conditions
. k ]! g4 N; i1 G& WNOTE 1 Such an appliance may be of one of the following types:( L. N5 x& h3 q8 z! Z' X
– an appliance having a durable and substantially continuous enclosure of insulating material which envelops all
3 [( r% i0 k+ T5 a! ]4 h7 L# l+ ~7 {! u/ Xmetal parts, with the exception of parts, such as nameplates, screws and rivets, which are isolated from live( y% u8 w0 r N; q7 b$ F# A8 H
parts by insulation at least equivalent to reinforced insulation; such an appliance is called an insulationencased$ b9 G- }6 T4 P: A* M
class II appliance;# E( D: B: R4 g& \/ R6 {6 c9 V
– an appliance having a substantially continuous metal enclosure, in which double insulation or reinforced
5 |* X* U2 O2 u0 d+ Y$ Minsulation is used throughout; such an appliance is called a metal-encased class II appliance;
+ p K: |! ^+ |- b– an appliance which is a combination of an insulation-encased class II appliance and a metal-encased class II
t" u( `; P$ a7 @$ w7 ~' pappliance.
8 F) A* z, ]* b3 pNOTE 2 The enclosure of an insulation-encased class II appliance may form a part or the whole of the
. h) Q# p& M# Gsupplementary insulation or of the reinforced insulation., Y6 ]* P: e/ e5 J. `+ t! E
NOTE 3 If an appliance with double insulation or reinforced insulation throughout has provision for earthing, it5 y# g- x+ Q7 S" H3 G
is considered to be a class I appliance or a class 0I appliance. |
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