DSH 332 Protection in single fault condition

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DSH 332 . v, p+ c* _+ @/ c2 V7 D

Protection in single fault condition

6.5 ; {9 V3 g9 K5 p1 w9 [" J

61010-1(ed.1);am1;am2

Standard:
3 P  z; T4 ]/ tIEC 61010-1:1990 +A1:1992 + A2
:1995
" B. r) W  ^: s% C3 ]Sub clause:
$ A, ^( C/ F3 Z/ h$ S6.5
# z* E+ q: @2 LSheet n. 332
Page 1(1)
Subject:
Protection in single fault condition
Key words:
- Motor controllers
% Y0 o. P/ Y% |/ |4 [% S$ @- Protective earthing
Decision n. 23 taken at
: H5 t# ^2 j* J* x1 v2 e37th meeting/2000
  V9 }# O8 W1 K# U3 O% S: ]+ x6 JQuestion:
; A: ^( m" v/ j! ?2 v: X5 fCertain motor controllers have difficulty meeting 0.5mA under normal condition
4 l0 W1 Q# @$ ^. E/ `; H7 z0 _% e# Jand 3.5mA in SFC. Is it possible to have two ways of permanent protective
2 \. r& t( {5 j! }* S3 lgrounding so that in SFC still connection to PE is assured (for permanent
; L; j; p4 \% C4 _0 x' hconnections only).
Decision:
2 u4 T8 J4 b" F% q! rFollow IEC61010-1 requirements.
Explanatory Notes:
The requirement for protective earthing is described under sub-clause 6.5. It should be
noted that under normal and single fault conditions accessible parts shall meet requirements.
For permanently connected equipment the protective earth must not be disconnected as a
single fault.
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