DSH 263 Earthing connection through moving part of class I motor

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DSH 263 ' r5 E# t. Q; R, l  R - [& M$ N+ G: Z( |" `; E9 A

Earthing connection through moving part of class I motor 5 }  m3 u( R5 L% L; {$ R# `

19.11.2, 25.1 and 25.6 $ U, F" a: N) \( c: s; d

60745-1(ed.2) & 61029-1(ed.1) 0 ?3 {7 H; f$ p2 @, U0 c3 R- a

Standard: IEC 61029-1, Ed. 1 / IEC
1 |+ _# U& G3 Y0 R6 p% D, F- u60745-1, Ed. 2
& ~* E% k1 f6 [9 LSubclauses: 19.11.2,
' K* g  \# \3 ?  F' E6 F' Y$ T25.1 and 25.6
Sheet n 263
' m+ V  b( X' b- o) QPage 1(1)
Subject: earthing connection
* P* `2 W- _# ^7 ]& s" C& Xthrough moving part of class I
motor
Key words:
- earth connection,
- moving part
1 W  X. t8 x* @& o& D/ jDecision n.19 taken
at 35th meeting/1998
Question:
We 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
  H8 H0 |$ g% w/ @4 }! xwindings and commutator by double or reinforced insulation) ?
Decision:
9 c6 p+ H( Q6 }' y8 OYes, the accessible motor shaft of a class I tool shall be separated from the rotor windings
. T6 N! q- M0 l4 aand commutator by double or reinforced insulation (class II construction).