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3.3.105 p! l/ ~& M) f( w& C4 N' C6 u
class II appliance
) s; c1 q6 v: k* D3 z; ]appliance in which protection against electric shock does not rely on basic insulation only
" `+ H! @; L3 k3 g& u- Dbut in which additional safety precautions are provided, such as double insulation or
; w" H9 }' c' S- c8 ureinforced insulation, there being no provision for protective earthing or reliance upon6 x" j1 @ _+ c( z1 X2 h. t
installation conditions
# L1 e( @- @% y& X% SNOTE 1 Such an appliance may be of one of the following types:# W" u' [- t$ d, w$ ^6 a3 Z
– an appliance having a durable and substantially continuous enclosure of insulating material which envelops all
$ @1 K; a/ x' q, l# t5 R! j# Ometal parts, with the exception of parts, such as nameplates, screws and rivets, which are isolated from live
; a9 Y L; h5 Y6 L* l; M. ^( eparts by insulation at least equivalent to reinforced insulation; such an appliance is called an insulationencased
& S; `9 `2 v, A+ j( R+ c: O3 iclass II appliance;/ e( r% p* k5 A' R4 J9 D1 n
– an appliance having a substantially continuous metal enclosure, in which double insulation or reinforced
& M& Z2 Q/ u- c* Ainsulation is used throughout; such an appliance is called a metal-encased class II appliance;
, ^* F8 I) z5 |2 ~7 l3 p1 _* q– an appliance which is a combination of an insulation-encased class II appliance and a metal-encased class II
5 j( l: p. C# s+ K; ^ \% E* qappliance.$ V: h) }% x2 S, Y+ I0 w8 q
NOTE 2 The enclosure of an insulation-encased class II appliance may form a part or the whole of the, w& V5 w5 ~ _* X/ y+ D' C
supplementary insulation or of the reinforced insulation.
! ]! ]3 t. C g3 k6 z; PNOTE 3 If an appliance with double insulation or reinforced insulation throughout has provision for earthing, it
& Q/ Z3 Q+ i! E( r" L! u* Lis considered to be a class I appliance or a class 0I appliance. |
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