DSH 332 Protection in single fault condition

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DSH 332   v& l, r/ e- G, y8 V

Protection in single fault condition : T9 z3 Y  \; K1 k& A

6.5

61010-1(ed.1);am1;am2 9 |/ ]7 Z4 w) g9 T/ X

Standard:
( _: R- ]5 }$ yIEC 61010-1:1990 +A1:1992 + A2
:1995
& o9 l# p' u( E/ _. ]/ J( JSub clause:
- o, F) @) _; i  D6.5
Sheet n. 332
Page 1(1)
/ P& O+ n9 L- n8 Y' R4 t1 v& Z; O# WSubject:
; R! S" u: K) O% w1 W& hProtection in single fault condition
# `8 P, B" q8 {  X, l. VKey words:
$ G4 Y/ Q3 W2 _- Motor controllers
$ p& s& ?0 y3 Z9 r* ?* x- Protective earthing
Decision n. 23 taken at
37th meeting/2000
7 h$ q" h$ e/ r4 ?! x7 nQuestion:
Certain motor controllers have difficulty meeting 0.5mA under normal condition
% e; J" F& \; d4 Cand 3.5mA in SFC. Is it possible to have two ways of permanent protective
grounding so that in SFC still connection to PE is assured (for permanent
connections only).
! S; N& D7 X4 _Decision:
Follow IEC61010-1 requirements.
Explanatory Notes:
The requirement for protective earthing is described under sub-clause 6.5. It should be
' D0 Q- d1 @' E% U% j# m; b! _  Mnoted 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
# b( G; l4 M9 q* Rsingle fault.

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