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|  DSH 263
' u2 R! X( Y' u' M" J+ U( h G/ n, V+ U, M6 N
| Earthing connection through moving part of class I motor
8 c! j: }+ ?, ? Z2 ^ | 19.11.2, 25.1 and 25.6% ^8 h& x* p4 r
| 60745-1(ed.2) & 61029-1(ed.1)
4 J' Z: ?& i0 a |
' d+ N$ r( |$ C1 k {/ \Standard: IEC 61029-1, Ed. 1 / IEC
6 N$ P) T( U9 t7 q! n60745-1, Ed. 2. F8 h; P0 a J1 j T
Subclauses: 19.11.2,2 f) v' P' o1 M- n3 m* K+ ]
25.1 and 25.6
* H* {6 h! N' |6 USheet n 263" U$ f- W$ @) k- M9 \6 m
Page 1(1)/ L2 I. _4 U7 ^: I( F3 \* ?
Subject: earthing connection7 i! S5 f( o, H7 L: w
through moving part of class I
) g5 _! {$ b! ^ Smotor$ s- H3 b. @ K6 R E: v( ^
Key words:
5 X! X3 b) _7 u3 M0 q- earth connection,
9 g, a; @, O" ~/ f5 {$ S- moving part
+ e0 m/ ~ [ V) ?" |) W7 rDecision n.19 taken* w) |; {1 J5 ?0 y/ U7 ]
at 35th meeting/19983 q$ m0 L/ D1 R: j" l6 ^
Question:" ^2 m4 d) [; p- P
We consider a class I tool employing a universal type motor. The motor shaft is0 Z n% N/ j/ W( g2 k# T- l1 [1 K
conductively coupled to the earthed enclosure through steel ball bearings.
, J& d6 { ]4 k2 x kIn this case, shall the motor be of class II construction (motor shaft separated from the rotor
9 i7 ^& y+ W; d2 k4 D! {8 i$ cwindings and commutator by double or reinforced insulation) ?1 C0 D# g2 ^: q
Decision:
- S7 v/ x& @/ X+ K1 _Yes, the accessible motor shaft of a class I tool shall be separated from the rotor windings( q) W9 O& a/ c! z o; i8 ]) e) D) K
and commutator by double or reinforced insulation (class II construction).0 u2 x- f& P5 g
9 ?0 B4 b: k% H* ~
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发表于 2012-11-8 15:30
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