DSH 263 Earthing connection through moving part of class I motor
http://decisions.iecee.org/icons/ecblank.gif DSH 263
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)
Standard: IEC 61029-1, Ed. 1 / IEC
60745-1, Ed. 2
Subclauses: 19.11.2,
25.1 and 25.6
Sheet n 263
Page 1(1)
Subject: earthing connection
through moving part of class I
motor
Key words:
- earth connection,
- moving part
Decision 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
windings and commutator by double or reinforced insulation) ?
Decision:
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).
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