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|  DSH 507
- m+ [: H! G$ s2 L6 u% u+ t
8 G. Z( S9 c: k) f4 f | Protection against electric shock
! M8 t& X6 e2 D | 8.2
. t2 l- i7 g w8 |# r% I- g% Y7 x | 60335-1(ed.3)
' L5 c: i" J& f+ b- |0 Q( `* ]! L |
& [# U9 h1 Q, I- x: sQuestion:3 H2 J: Y- {2 Z7 ?7 y/ D
Is basic insulation accessible through opening in earthed metal enclosure having paint! P/ q7 u* O( F
coating acceptable?2 `1 {5 ~2 @( H/ F) m3 H, u- N/ E
Rationale:
+ ]% m3 s: g+ a N) }# p# `& cSee question.+ f3 W! M. |) w4 P) e
Decision:* O! X4 m$ o0 D: M7 y
If the opening is such that the basic insulation is accessible without making contact at the8 R) i/ p/ t0 p# v- e
same time with the earthed metal parts, it is considered as a class II construction and thus not
- t$ d" u% f4 t* G. o4 a7 W' Jacceptable.9 ]* o8 F; ?7 L: i' v8 |6 {
If the basic insulation and the earthed metal parts are accessible at the same time, this is
5 n; s4 t" H8 B0 J' Y8 i6 _3 I# `6 H+ [acceptable, as the earthing is one if the protection means.+ C9 f( y* ^& \ w* c( B
/ w" Z7 W& f) z$ i
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发表于 2012-9-9 17:40
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