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|  DSH 263! j- `* x3 @; Q) h+ b
4 }, A% N% v# Q% U, S
| Earthing connection through moving part of class I motor
3 }1 m5 {9 r9 c C6 s( |) Q- t* S/ ] | 19.11.2, 25.1 and 25.6' q: M( P8 h# Y! s
| 60745-1(ed.2) & 61029-1(ed.1)
2 u! G" ?0 ?+ h, ^& U' s |
* E/ d' a& {9 fStandard: IEC 61029-1, Ed. 1 / IEC
z' E4 _- [: U- \, N+ M3 ?( H- h60745-1, Ed. 22 i7 V. L) B4 v- j
Subclauses: 19.11.2,) Y6 t" v- l% N+ F( {4 ]
25.1 and 25.6" [) j) N. L' t& g
Sheet n 263
! E0 ^% ?5 p9 Y6 n. r9 YPage 1(1)4 A$ K9 N: @) P! Z7 A
Subject: earthing connection; z. q) I6 w" `7 ~
through moving part of class I
: B: _/ J9 s# }1 E# \4 @3 ]8 kmotor
, a5 X9 k+ G' _" d# n, GKey words:
6 s! z8 u. T, Z! z& J& }1 k- earth connection,
) z2 _; y4 p- C5 [. D- moving part
/ Q. o6 @0 p6 l! vDecision n.19 taken" n, j2 D; Y. [8 J
at 35th meeting/19980 n+ C' B9 q# {
Question:; q9 ~3 V) d! L% u% g: i; {
We consider a class I tool employing a universal type motor. The motor shaft is; N# q( P! O V+ b% n
conductively coupled to the earthed enclosure through steel ball bearings.+ `8 ^ T7 l# M- m) E2 |
In this case, shall the motor be of class II construction (motor shaft separated from the rotor. L s C8 E: @ ^' K( D/ [
windings and commutator by double or reinforced insulation) ?
0 X* ^* I7 ~: u3 tDecision:2 c0 f( b3 U. F1 x
Yes, the accessible motor shaft of a class I tool shall be separated from the rotor windings
4 n" T: Q: j5 ^# p6 p3 d6 ]and commutator by double or reinforced insulation (class II construction).6 [2 Q0 ^& T- e1 A" ^
: x: e/ Y3 |' h2 ^! O2 z6 r1 O- a+ G |
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