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. ` A! I* d) X4 }) O& k! J. a& _+ E: M/ q0 S1 }9 W
|  DSH 332: q0 g! a) _2 m+ l# G
| Protection in single fault condition/ O" d2 s+ o; Y9 Y, R1 ~" |5 n+ V
| 6.5" x: j: W- S. Q2 m
| 61010-1(ed.1);am1;am2
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+ c. m% _* D' Y0 ^) s6 Z# ?0 t
% Q5 Y- i0 m, I& q# qStandard:! `9 O5 r! Q0 t( V
IEC 61010-1:1990 +A1:1992 + A2
1 f* v4 s8 s7 C$ [9 m:1995
/ L, }6 d7 V; @# o QSub clause:
) T. x) Y) {# A$ g6.56 M1 C$ A( P( T8 T& m
Sheet n. 332
& k( Y" \1 \6 D- t _- JPage 1(1)
1 U; ]1 j6 m# ?: i, oSubject:
: G9 S) m/ w7 DProtection in single fault condition
4 U3 v6 a0 J( s, _5 aKey words:! L x' C7 ^) l+ g
- Motor controllers/ t+ h% u( N' R% y ?5 r! x
- Protective earthing& b$ h3 r% N R1 q
Decision n. 23 taken at/ U' H. [ l# o
37th meeting/2000/ y# h* A' I, T; W+ ?" Z0 C; s* n
Question:8 m; A- Q, W- a: t, s
Certain motor controllers have difficulty meeting 0.5mA under normal condition, i" s ?) g ^
and 3.5mA in SFC. Is it possible to have two ways of permanent protective
" P R. ^* p+ T- i6 zgrounding so that in SFC still connection to PE is assured (for permanent
( g4 u k: b/ n8 H( y, Cconnections only).
. g) J6 C2 \8 jDecision:1 }) E4 F! o+ u$ {( K3 B$ K
Follow IEC61010-1 requirements.
) C( H8 q C, V4 Y sExplanatory Notes:
! L1 q" b5 U. @The requirement for protective earthing is described under sub-clause 6.5. It should be. }2 w& K' s/ M5 z O6 O' `
noted that under normal and single fault conditions accessible parts shall meet requirements.
- b5 J7 t2 w5 Z1 V! {( wFor permanently connected equipment the protective earth must not be disconnected as a$ a0 s0 D+ [- a F7 S7 W2 X
single fault.
" m7 L2 z1 H- r* b! y5 o
/ {# ?( y' h/ o9 v" a$ @
$ Y# x$ a2 H1 Y# Z3 b# a( I
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