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

19.11.2, 25.1 and 25.6 $ Q+ V9 |; t' K1 J( G' \1 T9 n

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

# U: q0 j! I- x$ X6 @! d5 HStandard: IEC 61029-1, Ed. 1 / IEC
  N' Q. C, r4 t: D* m60745-1, Ed. 2
Subclauses: 19.11.2,
25.1 and 25.6
, G9 B, w6 j7 o3 Y4 R* ESheet n 263
) L( R+ b) H- W$ O1 n' H" cPage 1(1)
4 e2 k2 |1 k* {0 qSubject: earthing connection
through moving part of class I
/ K$ K& L9 ?$ B; y1 ?motor
7 i0 P: _: l! v; ^, KKey words:
- earth connection,
- moving part
( c3 N1 E' a; Q( |' sDecision n.19 taken
at 35th meeting/1998
Question:
. R- f" u: V* Y( BWe consider a class I tool employing a universal type motor. The motor shaft is
( q! V2 m1 ~3 J& O: v% xconductively coupled to the earthed enclosure through steel ball bearings.
5 @( T+ F6 v+ D" ~! H' PIn this case, shall the motor be of class II construction (motor shaft separated from the rotor
windings and commutator by double or reinforced insulation) ?
0 k) r# L) H/ z* \5 F6 \) uDecision:
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).

) w& i% B, f* f) Z- _5 T7 `