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|  DSH 263
1 D4 x& c' p. M' n
. K# L$ k0 E v2 j+ K- H- E | Earthing connection through moving part of class I motor4 y6 i5 c/ ^$ ~8 d [( C
| 19.11.2, 25.1 and 25.60 ~, Y3 @% L2 `/ p& I$ ` J- m
| 60745-1(ed.2) & 61029-1(ed.1)
2 m! r" q3 a U1 ~/ g; `1 A |
7 N+ J* J3 B. D; Z V
Standard: IEC 61029-1, Ed. 1 / IEC2 Y2 w& B- H) R9 }6 `3 f
60745-1, Ed. 2
% H5 V& [+ d' Z5 q6 w u2 E5 J4 USubclauses: 19.11.2,7 {( k( L7 A; q! @" T5 a: q
25.1 and 25.68 x# B( z5 O. o) F" `+ t
Sheet n 263
0 Y; H; g5 t% H* j) ]. Z D6 hPage 1(1)/ Q' H7 j; Y& H0 ?# H9 t; q
Subject: earthing connection8 s h7 w/ z3 r' |1 H8 Q
through moving part of class I
; W3 p5 K( X9 J: y7 Tmotor8 _ `" Z K( ~2 z$ _9 l p7 ^: g
Key words:
3 `" q& I' K) Z7 ]- earth connection,5 j0 @) N; A5 h4 A( R3 N
- moving part8 `5 k: p$ Q& F9 m1 b
Decision n.19 taken
0 y7 O% T; n9 h0 ?8 Qat 35th meeting/19980 e! o: j& }/ _5 ]3 \) F
Question:/ G, R/ \- G& b2 B9 X7 s0 S
We consider a class I tool employing a universal type motor. The motor shaft is
, J1 l, Q y1 c# z& r4 G; Dconductively coupled to the earthed enclosure through steel ball bearings.5 B9 n2 Z" [8 I. [7 b7 c
In this case, shall the motor be of class II construction (motor shaft separated from the rotor7 H7 i/ t% W3 {% L( H5 f
windings and commutator by double or reinforced insulation) ?3 C0 d2 c' ]' C2 ^3 E6 a
Decision:
k1 _6 a) u) }Yes, the accessible motor shaft of a class I tool shall be separated from the rotor windings
4 c; f6 r5 r* ?, t" _% iand commutator by double or reinforced insulation (class II construction).
! S7 f' c4 @" B% F2 @2 p
! f2 F4 k1 s% s( E1 W$ m1 h |
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发表于 2012-11-8 15:30
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