DSH 263 Earthing connection through moving part of class I motor

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DSH 263 ! `. ~) G5 J" Z0 Q   @  @0 O* c% E1 z6 s% h" Z# N! `; D

Earthing connection through moving part of class I motor

19.11.2, 25.1 and 25.6

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

2 i9 ~7 S+ [& y4 cStandard: IEC 61029-1, Ed. 1 / IEC
: g# M) q7 v0 K. |0 T60745-1, Ed. 2
Subclauses: 19.11.2,
; k) s8 N; O3 a+ J: T2 E7 l' S  |25.1 and 25.6
$ b0 b9 `# R7 y! a0 P' d1 b# ?+ M( rSheet n 263
Page 1(1)
5 Y0 e& ?6 R8 G% b( O5 `Subject: earthing connection
through moving part of class I
. a* r7 q2 j- R& Y0 Z7 l( H$ u9 Umotor
Key words:
- earth connection,
- moving part
Decision n.19 taken
at 35th meeting/1998
, f# y5 L/ G5 N1 V' }/ Z& S( yQuestion:
1 |! ~2 a  l' s; q( aWe consider a class I tool employing a universal type motor. The motor shaft is
conductively 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
: `2 |7 @7 e: {5 w0 wwindings and commutator by double or reinforced insulation) ?
! Y: r4 M. }$ d8 i$ sDecision:
5 O( X4 p+ J+ RYes, 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).