DSH 263 Earthing connection through moving part of class I motor

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DSH 263   K% ~3 }3 U' [& C. |1 K

Earthing connection through moving part of class I motor

19.11.2, 25.1 and 25.6 % N! Z5 Z" B% w5 ]

60745-1(ed.2) & 61029-1(ed.1) " P9 g2 n  h1 z9 p: o$ w" e

Standard: IEC 61029-1, Ed. 1 / IEC
60745-1, Ed. 2
Subclauses: 19.11.2,
7 }$ k9 c( K4 _7 Z' n- y) R3 [25.1 and 25.6
$ ^3 ?1 I1 I" N. A# vSheet n 263
1 A" n9 U, f+ e6 R, l6 X8 N! APage 1(1)
7 r3 u( T9 y) |4 i2 u8 h3 pSubject: earthing connection
through moving part of class I
" U9 y1 g1 U- J" t, dmotor
6 b6 o- ^, v( z! UKey words:
2 \0 w3 S$ O2 F- earth connection,
- moving part
( A" @6 v" t8 e3 f- b$ a* }: w$ r7 wDecision n.19 taken
at 35th meeting/1998
Question:
We consider a class I tool employing a universal type motor. The motor shaft is
) j' y: t* p' o9 f" ?4 Mconductively 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
0 C; d8 l/ e/ L! L/ _, M. Fwindings and commutator by double or reinforced insulation) ?
& c$ }) L0 P$ ?1 o) _. }Decision:
Yes, the accessible motor shaft of a class I tool shall be separated from the rotor windings
( S+ K8 P$ X6 I$ {4 Q' D. m* Land commutator by double or reinforced insulation (class II construction).