DSH 263 Earthing connection through moving part of class I motor

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DSH 263 " u; m9 Y- ]. @

Earthing connection through moving part of class I motor ! y) s) _8 n) N

19.11.2, 25.1 and 25.6 - `/ s5 Z% S5 H0 k8 g1 g' y& k: L. k

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

' X- Z  A; }' a' LStandard: IEC 61029-1, Ed. 1 / IEC
9 y. B' n* h% R2 I60745-1, Ed. 2
' i# E1 r! s7 m" }# m/ f. m) ZSubclauses: 19.11.2,
3 T" F8 ^3 Y7 D25.1 and 25.6
5 t% A3 o" N& l& D  F1 u0 [Sheet n 263
$ U. L7 t/ m6 M: [1 ~Page 1(1)
) U1 F5 L1 q7 O; y# V9 tSubject: earthing connection
2 w4 H6 i" m' I8 e7 ^3 O" m, [& u1 othrough moving part of class I
motor
5 d2 K* a) e1 ZKey words:
- earth connection,
! X) G/ |5 W8 ]- moving part
Decision n.19 taken
( {) R5 |) C" h8 xat 35th meeting/1998
: ~% N. p/ m- S2 e! Q  WQuestion:
$ o! Q3 D9 O( Y& IWe consider a class I tool employing a universal type motor. The motor shaft is
conductively coupled to the earthed enclosure through steel ball bearings.
4 E% Q9 X7 `, h, i! |1 n( ^8 bIn 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:
9 U" ^+ \# s4 E4 l* X! i& X& P. c! LYes, the accessible motor shaft of a class I tool shall be separated from the rotor windings
1 _" f7 O: B1 Q1 A% fand commutator by double or reinforced insulation (class II construction).
2 g* G% {  Y$ E8 d" F2 n! C8 z1 [/ c