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" W4 E5 Z: S% y- U+ a
6 Z7 V) E2 ~- Q; ~+ T; b- D
|  DSH 332' }8 S4 n9 \/ K* t- e# s5 [
| Protection in single fault condition& q6 u2 K: h& L' c s6 y+ n9 @
| 6.5
+ [9 r* R/ n$ ]1 Q | 61010-1(ed.1);am1;am2
6 _' V; k; [5 i7 R |
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# L8 b$ I) j& @; iStandard:
2 N# k' X5 {- W2 T# P2 H+ U+ hIEC 61010-1:1990 +A1:1992 + A2
$ M9 l7 e; X/ E' M& e# ^4 U3 l0 [:1995% m1 N* q2 ]- ?9 c8 j6 s
Sub clause:
) J9 p/ c& e( H6 Z! _6.5$ B1 u+ j( E0 u- e
Sheet n. 332/ K1 U' O& V$ v1 O! o" r
Page 1(1)
) u4 l3 c7 l- w8 F8 t3 Z' l: K+ |Subject:" @. a" ?* n( F9 k& v
Protection in single fault condition, A9 ?: z2 F3 M0 @, z
Key words:
) \- y" Z$ s9 b# m4 @- Motor controllers
1 d/ e) W) P0 U% F- |2 W3 a- Protective earthing
: y& [* ^- u& ~* \( z$ T TDecision n. 23 taken at
0 d3 Z2 c) ~( d3 O: F2 c3 h$ M37th meeting/2000
4 w8 O7 r" O2 U( GQuestion:- z+ Q# p" {7 J: X8 O
Certain motor controllers have difficulty meeting 0.5mA under normal condition% A: v& q6 [) s
and 3.5mA in SFC. Is it possible to have two ways of permanent protective0 {& C) ^/ Q2 [! e& X v, \
grounding so that in SFC still connection to PE is assured (for permanent
]! ^4 j4 A8 u6 W. q- S6 z6 ^connections only).8 Y% k+ o3 l U. T1 ~
Decision:1 S( N6 u3 H: e, Y5 M/ Q
Follow IEC61010-1 requirements.3 L$ Q7 U/ v% J
Explanatory Notes:1 f4 T1 N; U1 a, `
The requirement for protective earthing is described under sub-clause 6.5. It should be# H; C) ~* i9 y# s. ~
noted that under normal and single fault conditions accessible parts shall meet requirements./ L% R4 R4 L- ]) q. R
For permanently connected equipment the protective earth must not be disconnected as a- @9 C4 J7 d' C* f0 r# B
single fault.. t5 [1 u* U i/ a/ V
7 }$ M, M$ v* k3 `! Y
& c9 I0 e/ _4 A, D, Z0 r0 z( u3 E6 a
+ }7 S. r! z' w. u9 H |
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