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( p. Y4 [! ]5 e2 \3 [
|  DSH 332
: f7 w: [. A; c. c K6 V | Protection in single fault condition8 }3 r: b) h4 T8 D2 i
| 6.5
8 K7 \! l; V$ T) w2 g5 l; G/ i | 61010-1(ed.1);am1;am2( b6 G1 h6 G8 E8 }
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& L* A- d8 {8 q2 S7 s$ {3 _2 A
3 }3 L, P' M+ `, PStandard:8 ^2 W* r3 L3 }6 I) f
IEC 61010-1:1990 +A1:1992 + A2: `1 S8 w) C1 L4 }) t
:19953 w; e( U+ v, `3 Y
Sub clause:
7 P# X- y- R$ q6.5
I4 e# z5 H" J) Y, aSheet n. 332
2 u" O" B& Z& O+ Y( |; VPage 1(1)8 q4 Z- l ?; W# v$ O
Subject:
4 x* n% c# k- s/ v6 |2 M4 L# [Protection in single fault condition
- q d4 n9 G" E0 S1 j( A& }/ C% YKey words:
; B7 W9 T* d+ l# y4 s: T- Motor controllers
3 R" m0 f- H. b; y- Protective earthing
; G2 ?/ a+ a! P2 |2 DDecision n. 23 taken at4 S+ Z$ f! r+ E
37th meeting/2000
3 N4 d! ^" {( A3 B- b0 fQuestion:
2 x3 k2 r1 i' ^8 i& xCertain motor controllers have difficulty meeting 0.5mA under normal condition
1 t2 B' {( [2 `, w) q" band 3.5mA in SFC. Is it possible to have two ways of permanent protective
$ k! w: p, Q% p. T3 {3 ?- egrounding so that in SFC still connection to PE is assured (for permanent
3 G0 D" v1 K( v. Econnections only).
7 V+ T9 a$ m& aDecision:
1 f! r( P& a; ~3 Z" KFollow IEC61010-1 requirements.$ y# M0 ?! R: J* R9 o9 K" A
Explanatory Notes:9 j' ?( l, v( a* i* ~ H: x6 k
The requirement for protective earthing is described under sub-clause 6.5. It should be
' }/ U) Q7 o/ v6 n" w7 Unoted that under normal and single fault conditions accessible parts shall meet requirements.; h7 |) c' [8 v0 p0 |/ L" u) x( J2 d
For permanently connected equipment the protective earth must not be disconnected as a
" w; o3 [4 H) \single fault.
: H3 c* A3 @; Y( N$ g7 J8 W- ~6 n; h7 `& X. s. G E
$ l4 K$ Z- i/ ?7 K& r! g9 Q& E0 E5 s% U" C* W
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