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|  DSH 263
1 U8 R' A; l8 z! y! r; k5 h3 L4 p. s1 l; k5 ]7 a: d7 ?% i M
| Earthing connection through moving part of class I motor, c; w* T Q7 j6 P! t
| 19.11.2, 25.1 and 25.6+ T1 O0 g1 c( J0 H. s8 B7 k
| 60745-1(ed.2) & 61029-1(ed.1)" z. H! { N7 D0 u5 M$ ?; h- \
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( _6 c. y# Q3 f% Y# U* ~8 vStandard: IEC 61029-1, Ed. 1 / IEC
( H; ?5 d" [1 d2 }" J( P8 J0 s& H60745-1, Ed. 2
' T0 R& ?/ o4 l( cSubclauses: 19.11.2,1 ]& K8 s3 O0 Y- Q7 a9 D7 F
25.1 and 25.6
3 ^& `- m" `; s! I9 r/ b& QSheet n 263( Z: S% _3 {+ p+ E
Page 1(1)" d4 g4 Y& z2 Z# T$ A
Subject: earthing connection( S( u( }3 i" y. P' n
through moving part of class I
Q% y8 B) r4 n/ f3 dmotor
- h9 H e n4 C& k$ H( S) g5 {Key words:
, o# o, P( u: n. V$ T% y" }8 V4 U- `- earth connection,
" b$ z2 |4 Z. j, @9 V- moving part2 F! w. a# x6 X& |. i& S' W2 C
Decision n.19 taken9 k4 G; ?/ P X c; v
at 35th meeting/19981 U- x# N3 s" W |/ `
Question:
& L1 e2 f3 R& v2 zWe consider a class I tool employing a universal type motor. The motor shaft is
* ?; |- V! a+ D; o* @: n8 Vconductively coupled to the earthed enclosure through steel ball bearings.
0 f1 x% E0 c3 x6 aIn this case, shall the motor be of class II construction (motor shaft separated from the rotor3 O. R- z3 j+ {* d% A
windings and commutator by double or reinforced insulation) ?; K- U3 y* Z) G" p
Decision:" v! k$ p$ f6 v! f: j/ Y
Yes, the accessible motor shaft of a class I tool shall be separated from the rotor windings
" V* U: g- M, S7 ~* aand commutator by double or reinforced insulation (class II construction).
; j( h% C0 a$ Q# E- @0 N+ [
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