DSH 263 Earthing connection through moving part of class I motor

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DSH 263 : G; I  I3 \+ r, l! B2 R

Earthing connection through moving part of class I motor * @" S: [$ g5 X4 M

19.11.2, 25.1 and 25.6

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

Standard: IEC 61029-1, Ed. 1 / IEC
. h$ O. _) q7 c2 j) j- k60745-1, Ed. 2
/ A: X" i) D+ r4 g5 nSubclauses: 19.11.2,
( k& |1 k$ `% p. H; L; O25.1 and 25.6
* h! L# A. d7 C6 X" GSheet n 263
Page 1(1)
Subject: earthing connection
through moving part of class I
% z! @4 A5 |0 t; ^' F- u- }motor
Key words:
& S/ j5 j/ q+ I9 K4 Y' ~# q- earth connection,
- moving part
2 F% \' d7 Y" D" o% Y7 ~/ ZDecision n.19 taken
at 35th meeting/1998
3 F. ?" }$ h8 Z( M* UQuestion:
9 z# j  b  j$ R0 }5 l) O+ ]- vWe consider a class I tool employing a universal type motor. The motor shaft is
conductively coupled to the earthed enclosure through steel ball bearings.
4 q" D$ w5 F% Z/ p1 cIn this case, shall the motor be of class II construction (motor shaft separated from the rotor
windings and commutator by double or reinforced insulation) ?
7 Y7 o, `) G+ z2 xDecision:
) j; `! i4 j2 bYes, the accessible motor shaft of a class I tool shall be separated from the rotor windings
+ D  c& H4 R) M% c( Zand commutator by double or reinforced insulation (class II construction).
: b/ Z7 {$ w# h8 ?- D
) m/ F) p2 a2 b! E6 I; ?; U; a