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|  DSH 263
% J3 z* w; | z0 R( u8 a. g" J, a) j0 G5 \6 w
| Earthing connection through moving part of class I motor( z% {6 w: L# S" Z8 t: w
| 19.11.2, 25.1 and 25.6
; ]5 W9 T" A( k/ M* U% N | 60745-1(ed.2) & 61029-1(ed.1)6 O" s8 x( x% k6 K
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( S; B3 X9 { d s# N
Standard: IEC 61029-1, Ed. 1 / IEC
3 y8 f' Q- [" Y9 F60745-1, Ed. 2$ A% N( V: w, d7 @3 W7 G9 L! D
Subclauses: 19.11.2,& V0 b3 S& t5 W$ ]- L r; @
25.1 and 25.6, |& T) n( `1 c* w7 R9 o% K
Sheet n 263' n* q+ W3 F5 q% `; `
Page 1(1)
0 U' M5 S. X+ f4 F% nSubject: earthing connection2 Z" Y! r( U; Q8 a
through moving part of class I
d' A$ u- ]9 I6 ^" Z; x% Umotor0 ~1 `& U, x1 ?/ n6 T
Key words:
9 D, G" d/ x# R, w) B( G# T' m, q8 L- earth connection,
' G9 ~" v0 n. ^4 L+ u* G- moving part2 N) a" ?3 v& t. J6 X6 H
Decision n.19 taken. q! X$ _" R2 W: q* d0 G; W2 x
at 35th meeting/1998
( F8 s0 @1 j8 a+ n) v4 FQuestion:
* ^: B9 e c h8 Z! k+ H5 K7 l' KWe consider a class I tool employing a universal type motor. The motor shaft is
. V& H \5 H0 l7 Hconductively coupled to the earthed enclosure through steel ball bearings.
8 v# h( z9 ~2 w+ M& UIn this case, shall the motor be of class II construction (motor shaft separated from the rotor
8 ^9 k% W/ s' y( _windings and commutator by double or reinforced insulation) ?
! M2 S/ R' u' b1 f" P: w* d2 B; i5 r& j/ LDecision:
" @& R. C- c" E8 e8 aYes, the accessible motor shaft of a class I tool shall be separated from the rotor windings
; B! O5 w9 f c8 D, Iand commutator by double or reinforced insulation (class II construction).# n' B* C. h+ k! ~( o5 i% F! ?' `# h
* y6 B$ P3 M7 f0 i0 g \ |
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