DSH 263 Earthing connection through moving part of class I motor

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DSH 263 5 u* ]! F4 `4 F4 T# \% ^' e! q 0 j# i( T" [8 h3 x+ r% y- i

Earthing connection through moving part of class I motor ' j  P' e1 _5 \' K9 L

19.11.2, 25.1 and 25.6

60745-1(ed.2) & 61029-1(ed.1)

0 g7 W8 e+ ]; e$ v+ N# RStandard: IEC 61029-1, Ed. 1 / IEC
3 r: N% |) J8 v$ L1 K8 P60745-1, Ed. 2
9 t. D" O$ K; z/ ?Subclauses: 19.11.2,
25.1 and 25.6
Sheet n 263
Page 1(1)
Subject: earthing connection
0 i1 b% G7 C/ Wthrough moving part of class I
/ m+ r2 n6 R& F9 b: G* Umotor
3 k+ }( \# Z; l# Y7 |" s, \, xKey words:
' W" @. {6 p' ]. Z1 T$ W9 s- earth connection,
- moving part
* S: Y% }' @6 r2 T. R& Y5 ZDecision n.19 taken
at 35th meeting/1998
Question:
& @; W" M5 d6 O. e2 u: |' TWe consider a class I tool employing a universal type motor. The motor shaft is
% a5 A. y8 {/ Z0 n: Y$ J$ uconductively coupled to the earthed enclosure through steel ball bearings.
In this case, shall the motor be of class II construction (motor shaft separated from the rotor
+ g/ U9 F  j: v$ J* {" o- P* vwindings and commutator by double or reinforced insulation) ?
# w+ @5 t. _& }  S2 W( YDecision:
Yes, the accessible motor shaft of a class I tool shall be separated from the rotor windings
and commutator by double or reinforced insulation (class II construction).