DSH 263 Earthing connection through moving part of class I motor

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DSH 263

Earthing connection through moving part of class I motor 2 x) A5 v" F+ s; M8 w: W

19.11.2, 25.1 and 25.6 % Z. D7 u& q: T/ Q' \& ~7 _

60745-1(ed.2) & 61029-1(ed.1) 7 N. p; A3 ^6 ]% ^+ \

* G/ t' P" a5 @Standard: IEC 61029-1, Ed. 1 / IEC
60745-1, Ed. 2
Subclauses: 19.11.2,
25.1 and 25.6
Sheet n 263
' o. {8 P: h$ ]6 c( aPage 1(1)
Subject: earthing connection
% r7 U) u) K1 k$ [- |9 |9 Z1 R& athrough moving part of class I
2 v6 U. a  ?- c9 a) |* Tmotor
6 R# r8 c0 S: r. |+ X7 i( F/ jKey words:
- earth connection,
- moving part
Decision n.19 taken
at 35th meeting/1998
' S2 ?" w# `% |/ E# f. HQuestion:
) f9 V4 H. Z7 Q7 g9 [3 m. n. V# PWe consider a class I tool employing a universal type motor. The motor shaft is
' ]3 A3 d7 o8 V. g8 R& rconductively 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
windings and commutator by double or reinforced insulation) ?
Decision:
: J9 |5 D" ]& b: x0 j7 ?9 {/ f7 K  D( b0 ~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).