DSH 263 Earthing connection through moving part of class I motor

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DSH 263 , [5 ~- J) ]0 s8 w9 Y* }- k( A; O   |0 @% v9 l3 _# {$ `& Z9 j. n

Earthing connection through moving part of class I motor : A! H$ K% U) |

19.11.2, 25.1 and 25.6 3 E9 b7 o7 D; E( g

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

1 E8 g1 b2 n3 z2 D4 s# z* X2 FStandard: IEC 61029-1, Ed. 1 / IEC
60745-1, Ed. 2
Subclauses: 19.11.2,
: h1 k% e$ C# T$ K' N25.1 and 25.6
Sheet n 263
Page 1(1)
Subject: earthing connection
through moving part of class I
5 w  L1 a/ J: {, z* E! l/ O1 @motor
Key words:
' O4 \! N1 g% h! t  `5 N6 D* R# N- earth connection,
; J% D+ \* w, \- moving part
Decision n.19 taken
at 35th meeting/1998
) z/ P# w4 u1 {& pQuestion:
7 W( d. y2 u; u" M: xWe consider a class I tool employing a universal type motor. The motor shaft is
% \! G. e% G4 i% B0 e& `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
- @: z' I7 @( i; n( g8 k3 xwindings and commutator by double or reinforced insulation) ?
Decision:
0 L* f( h9 o. t& Q* _Yes, the accessible motor shaft of a class I tool shall be separated from the rotor windings
, ?1 O+ k- c# @  ~8 r0 C7 @7 jand commutator by double or reinforced insulation (class II construction).
2 [. X! s  w, `/ S5 W7 a4 f
# F* P6 M4 p" T) U- R