标题: DSH 263 Earthing connection through moving part of class I motor [打印本页] 作者: 小米 时间: 2012-11-8 15:30 标题: DSH 263 Earthing connection through moving part of class I motor
; o9 l; o5 a1 {* B& ?; OStandard: IEC 61029-1, Ed. 1 / IEC + R- m# L5 E0 k1 P$ ~! Z4 p60745-1, Ed. 20 }) G& o, X) F- w, J
Subclauses: 19.11.2,2 J+ i/ a7 a1 T; e% g, C
25.1 and 25.6 ; H6 n5 G& D% a. `6 r9 ESheet n 263 " D7 X& X( L% l RPage 1(1), [, _! v3 L$ ]: ?
Subject: earthing connection- T6 I& v7 j, O" U9 g$ w& c
through moving part of class I* V0 B0 z" M( X
motor/ x+ h( j# u! Q+ _# U
Key words: 1 S: W% ~' A! Z' ^, q6 e8 q, \- earth connection, * V& d$ o9 X- h, ^; C- moving part* ], A# C6 V$ _7 B7 |
Decision n.19 taken . |$ x) g' V8 l2 i a' tat 35th meeting/1998 + i- P4 ]; S5 t6 F/ \Question: " `% y5 @5 t, z0 J1 v: q$ FWe consider a class I tool employing a universal type motor. The motor shaft is* W N4 s5 [! P: N" Z
conductively coupled to the earthed enclosure through steel ball bearings. , |0 `/ ?( Z- A4 t* dIn this case, shall the motor be of class II construction (motor shaft separated from the rotor8 s/ N n: A2 i1 J b
windings and commutator by double or reinforced insulation) ? ! V$ e) ~1 ~9 H: v {2 RDecision: 7 ]+ G# k- G) D. [* O/ O7 M9 cYes, the accessible motor shaft of a class I tool shall be separated from the rotor windings+ F H1 s* ]- G
and commutator by double or reinforced insulation (class II construction).4 o0 p: ^4 {8 F, ]' z1 N! E
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DSH 263