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% c7 m* I9 u) Z0 w
3 ^& o z& l9 l3 M7 K$ R5 d% l |  DSH 332" ~9 l' N n. |! e2 H* m/ o
| Protection in single fault condition8 f# E4 \: ^: g. N3 f5 z: b
| 6.5; ]' s7 p/ d) s' a
| 61010-1(ed.1);am1;am2
5 k7 A: N1 [( w7 U: @, ? |
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Standard:# P3 W! T0 ]: k. f' }* _) w
IEC 61010-1:1990 +A1:1992 + A2
7 M. _; g( c1 }9 R- k, ~6 q:1995
( E0 D1 _3 l3 I: g0 ySub clause:
5 Q+ Q* S5 B# r4 x$ p6.5. r3 p: X4 Q, x5 K( V
Sheet n. 332
9 _. G1 q" v) {" v w: _3 |$ {# ZPage 1(1)
* p- j6 ]( j N/ u* q9 `8 `Subject:* `7 G) ^( x" F- r! o, @
Protection in single fault condition
! }7 {( ]4 G4 |Key words:
6 F. Z( B3 {& J# x1 g- Motor controllers! \3 g5 D9 Z# v6 k6 N' \$ P
- Protective earthing5 `) |8 \" k) b, S6 Y
Decision n. 23 taken at
# S* `. x. P/ \% j5 H37th meeting/2000) h, y! N V" [
Question:
& _2 c0 f2 @$ e& W: TCertain motor controllers have difficulty meeting 0.5mA under normal condition j9 p+ V& z. m* r% e7 H: z
and 3.5mA in SFC. Is it possible to have two ways of permanent protective* w( ~5 u$ X. o; r, \
grounding so that in SFC still connection to PE is assured (for permanent1 Q" H3 Q4 K9 Q# q8 o7 O3 t m+ b
connections only).* |* n) e, L: W/ w) a# l5 R( ]
Decision:
0 q! E" s6 |2 H. a) f/ r7 FFollow IEC61010-1 requirements.
) N3 w" A) a' u# _3 IExplanatory Notes:
& w5 o# u4 d: n1 @$ eThe requirement for protective earthing is described under sub-clause 6.5. It should be
$ [/ J5 O3 r; R4 |noted that under normal and single fault conditions accessible parts shall meet requirements.
% A5 }5 {; F2 ^$ U& vFor permanently connected equipment the protective earth must not be disconnected as a& l8 }2 z7 _3 `- L+ p' M
single fault.
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7 m, x' N, ?4 y8 j& | t" m1 S
$ o* }, [; k. E7 w% Q3 _ m |
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