DSH 263 Earthing connection through moving part of class I motor

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DSH 263 1 v2 `7 x5 A9 d. [ # L( g: ^* b. H# B) A" s' m2 ^

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
- s$ i7 J4 @6 |7 W) {Sheet n 263
& V- z- X( Z: R, M4 l2 `1 a) mPage 1(1)
Subject: earthing connection
through moving part of class I
6 ^. {  l( G8 f: P$ Qmotor
Key words:
7 H" K& i" A; R% L0 W; C- earth connection,
- moving part
) B4 A$ E; |: ~" j0 f6 q# r: r* hDecision n.19 taken
at 35th meeting/1998
2 m: i" Z3 @: c& `% ~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
( u$ ]  j1 |: m. Uwindings and commutator by double or reinforced insulation) ?
Decision:
- ?/ x  O' I7 ?4 fYes, the accessible motor shaft of a class I tool shall be separated from the rotor windings
- C0 M" X( p! d. ?5 P! Hand commutator by double or reinforced insulation (class II construction).
& r0 Q) M- ?* v) u5 a