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|  DSH 263
9 \9 T2 Q M: Y* o' H) V+ U$ i7 W1 ]/ p4 F7 A0 C a3 z4 q+ J5 u
| Earthing connection through moving part of class I motor
/ _0 R# ~3 K2 ?3 W; ~4 z0 t7 c8 G | 19.11.2, 25.1 and 25.6' _" j( ~* O! F8 f
| 60745-1(ed.2) & 61029-1(ed.1)2 ~' D5 h7 Q( r8 s
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! m; X; w0 y& N- D4 R) k! X; {Standard: IEC 61029-1, Ed. 1 / IEC' o( e# Q: U' t4 I3 P5 ^: y
60745-1, Ed. 28 K4 a! |+ R5 n! u( x; T' M
Subclauses: 19.11.2,9 P7 n3 s- w9 S/ F! S
25.1 and 25.69 ?2 v6 Y9 J' y) x K# ?/ L! B0 Y
Sheet n 263
( q6 r5 ?9 ?, qPage 1(1)
: i' K, H) i& e/ N s4 g& ]# ESubject: earthing connection. @# j% }6 ]8 X: V1 O
through moving part of class I
2 T5 J& |+ f& o( vmotor
9 C& z; Y$ \6 Z5 k' Y8 x% G0 rKey words:
t) o' ]) U6 {+ h* A+ p- earth connection,) m* j3 q2 ]& }5 w% y
- moving part9 D- Y3 W2 I9 |6 ^8 K
Decision n.19 taken
: x+ P' A* t/ L8 Gat 35th meeting/1998
- N% e+ v9 P2 H) X( \+ Z- u V0 qQuestion:
7 D* J T m4 z8 ?. t" xWe consider a class I tool employing a universal type motor. The motor shaft is
9 q5 I5 E3 ^6 xconductively coupled to the earthed enclosure through steel ball bearings.. B7 i; k8 p1 E5 n7 H) W0 E: ]. \& o
In this case, shall the motor be of class II construction (motor shaft separated from the rotor
% e/ B% m1 [! U2 D8 rwindings and commutator by double or reinforced insulation) ?' ~ F3 f6 `' z6 G. O
Decision:
0 R0 ]- l: }. g3 r& X! tYes, the accessible motor shaft of a class I tool shall be separated from the rotor windings0 d* h5 {; o5 O; f/ K3 h* x
and commutator by double or reinforced insulation (class II construction).% j4 E; E# K$ ?* Q% f! m6 p
3 D# w. o0 _& ^3 E$ P
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