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5 w1 _( o$ w/ u+ e3 B# x9 r! ]* T5 E/ V. j' j' x
|  DSH 332. Z) g8 @# W7 o/ Q
| Protection in single fault condition- |3 `7 e# D8 ]* D+ z
| 6.5: o8 Z" W( f6 e. U) f
| 61010-1(ed.1);am1;am26 Q: T6 }$ ?- v( t. G
|
6 H! I9 ], s+ v8 b( |+ k4 i, t0 H+ l6 O+ N# G
Standard:/ m* e \. s1 c$ q" V( @
IEC 61010-1:1990 +A1:1992 + A2
2 q8 v# p, s! k$ N. b, C:1995
% D& O7 E$ l- `6 M9 o" {) dSub clause:+ Y7 D* ^" p# F5 u( `( U+ `' Y7 k) n
6.5" N4 p$ ^9 K% e* W* n) Y
Sheet n. 332 u6 o/ y3 T7 T
Page 1(1)
8 W) E* r) p- L& T! aSubject:
& w; X' w" R6 ]6 x# v5 J* FProtection in single fault condition& P" Z! J& I4 U7 s& V5 U5 m
Key words:
3 t7 q. B: r( T8 H! Q- Motor controllers
1 A" t! ]: R, }3 \: j, y- Protective earthing9 }* X& b( i( r1 t
Decision n. 23 taken at4 t" Q6 U0 y/ A8 a* L7 T1 V. p
37th meeting/2000- E# f% ~% y" Y# u* G) u% X
Question:
* ^- j1 F. ? l) m- {Certain motor controllers have difficulty meeting 0.5mA under normal condition9 e( d/ w Y/ n5 E; J% n! j7 X
and 3.5mA in SFC. Is it possible to have two ways of permanent protective
8 T/ o% e3 h3 z+ Jgrounding so that in SFC still connection to PE is assured (for permanent. i% s0 }4 U z; u6 e9 J7 X, N
connections only).
, }; L- L @: r; P- xDecision:
/ }. }, I/ u3 |Follow IEC61010-1 requirements.# \! l5 s0 I2 J+ o1 o3 z, r& s% z& Y
Explanatory Notes:
' _% k8 Y4 Z$ kThe requirement for protective earthing is described under sub-clause 6.5. It should be* M" N2 e* t' l5 ^$ B# G9 H
noted that under normal and single fault conditions accessible parts shall meet requirements.
0 o' r! q5 M; u; z) gFor permanently connected equipment the protective earth must not be disconnected as a3 n8 d8 T- l. C5 { n$ U2 q
single fault.. s* F W# i" T j
) N4 o. T# V+ v. n0 g) [
F8 d6 ^' U% `& _. v
2 w' n: W8 s: J8 E |
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