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6 c9 W8 b' k( p* v' l$ E$ W
0 r; ~) o0 \( x& s" C |  DSH 332
T" o! V L+ I) ]- w. V | Protection in single fault condition
& i! c+ U( q! D6 X( O# M( i | 6.5/ U) y9 ]6 t- R0 {
| 61010-1(ed.1);am1;am2: _0 G# r O" X
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, c0 d8 z; c: ]* D* r0 UStandard:$ u @' u) ?* o- q
IEC 61010-1:1990 +A1:1992 + A2& Z* g& i& J! C
:1995 }7 |) B% x x- ]2 Z
Sub clause:
9 u) V6 x& `+ `" \6.5
5 h7 J5 W- M$ y- Z3 l3 qSheet n. 332+ C. [8 L4 `$ j
Page 1(1)2 T" O# o @0 H8 f+ p% n
Subject:. ?& ^9 r {# k* B8 H' V# j
Protection in single fault condition$ A+ |2 ?% N' w* u% l
Key words:$ L- e% ^8 A& k3 S8 G' f
- Motor controllers
/ h8 Q3 @7 y7 I0 n5 m4 G; B; v4 B- Protective earthing
) u7 R* w# n- Q0 p/ L$ a8 hDecision n. 23 taken at% T# A, c3 { |- W) X
37th meeting/20001 }. H @6 y( g$ i+ y# K0 ?
Question:1 w0 K/ |* H* Y3 G& ?
Certain motor controllers have difficulty meeting 0.5mA under normal condition6 ? k! z% o) O S1 x; }
and 3.5mA in SFC. Is it possible to have two ways of permanent protective
: [ u; S9 f/ O2 ^( U. agrounding so that in SFC still connection to PE is assured (for permanent% k( _8 H2 U3 `+ G5 E: ?5 D
connections only).
3 A3 X% _: S# ?$ ~: GDecision:1 o7 V9 }' b( P* d" X
Follow IEC61010-1 requirements.
: P( y; d/ I$ C$ F/ GExplanatory Notes:* ^& m: j0 L" \
The requirement for protective earthing is described under sub-clause 6.5. It should be; }8 R# }5 z. }" B+ j0 j! G
noted that under normal and single fault conditions accessible parts shall meet requirements.
# }' M" ^( T4 ^5 fFor permanently connected equipment the protective earth must not be disconnected as a
. d. z1 |2 o% I4 U6 J" Asingle fault.3 h4 @6 ?2 g8 z, E' q, A; D n0 D! I( N
, b; z0 j; I4 i% j$ K
% _6 V7 D9 |/ R; ]' i. |$ R# E6 p' R. B- _: R0 I
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