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0 f' V( M/ g- E; c- M W: k: x: P: B7 u. B
|  DSH 3322 ?4 D# d M' I- O
| Protection in single fault condition
. \, j3 W/ H8 ~5 j! z | 6.59 ?5 Z1 }1 Y+ x5 T9 y" R
| 61010-1(ed.1);am1;am2& o" W6 {! n3 E2 \! T
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. f; }# y* A& A& [' D/ ^
' `: ?& H. V& [) M: ~! K
Standard:
( c7 F; f/ H$ bIEC 61010-1:1990 +A1:1992 + A2 j) Y& W; V/ I/ g: H0 m) _. K; e
:1995
5 j- h2 W! R- v) M3 n1 U rSub clause:: F8 F6 r" r. x% k$ y
6.5+ ^7 Y2 S7 ~4 u
Sheet n. 3328 ~; ?: d4 t6 n4 x. j4 S
Page 1(1). c) P$ U4 k1 s, I: e! L4 N, c. s+ S
Subject:' G, S; z' ?% w( m, b+ S
Protection in single fault condition# i7 \7 T i) h( F2 i
Key words:
, ~4 a6 K$ s" s6 |- Motor controllers7 f. ^- A0 s& U- ?3 Q
- Protective earthing7 C* Z1 k5 y2 e: V$ N
Decision n. 23 taken at
5 U$ P, g/ U1 X- R: _37th meeting/2000; W% S6 y$ T& t5 j
Question:7 k+ T& | u9 D6 X( C" [1 o9 {
Certain motor controllers have difficulty meeting 0.5mA under normal condition4 C/ V5 T; h5 D5 E6 ~( [/ a( C
and 3.5mA in SFC. Is it possible to have two ways of permanent protective# g5 F+ a; Y: n0 y# g- u5 i
grounding so that in SFC still connection to PE is assured (for permanent
, r9 C, G% ~$ p2 C: X! k. n$ Z# Lconnections only).6 V D0 [. Y! q; s4 R
Decision:
- `5 I; y1 y6 R. p& p/ N, {1 z- OFollow IEC61010-1 requirements.
$ E8 z7 g ?$ E3 d+ }3 ? a( h* a% `Explanatory Notes:0 }- g$ Q' l0 K9 M6 v7 |* K8 E; `
The requirement for protective earthing is described under sub-clause 6.5. It should be( w; _6 r% A# k x& {' ]
noted that under normal and single fault conditions accessible parts shall meet requirements.
3 p& P! Q7 M% e1 qFor permanently connected equipment the protective earth must not be disconnected as a0 p% X- B6 X) r' \( u
single fault.
i9 s2 n4 q3 J) T
s0 Y1 [- d0 c$ c- v% \- I' ~- h5 A
* X2 C" O' U" _$ D- K6 X
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发表于 2012-9-19 13:58
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