|
|
|  DSH 263
8 h9 e7 D+ u, L- y( {% S d9 [( W2 M+ p+ k+ y6 n7 T5 C
| Earthing connection through moving part of class I motor g9 r: f' h+ e( ?3 ]* l5 ^8 ~& z# i7 h
| 19.11.2, 25.1 and 25.6% @# Q4 z% v8 t+ ~: C& v
| 60745-1(ed.2) & 61029-1(ed.1)$ s* _. l$ u8 F
|
/ M/ ^7 K) D- A2 ^7 w- _
Standard: IEC 61029-1, Ed. 1 / IEC* B# A7 s n6 z+ k8 {
60745-1, Ed. 2
1 N. z: b* N6 v, p. RSubclauses: 19.11.2," B) e3 O# j6 h# U% s
25.1 and 25.6
$ k# R5 D$ B1 b2 n$ |Sheet n 2634 U: F9 X: c& ^2 H* o5 j4 J; d
Page 1(1)
9 @2 T$ L v! wSubject: earthing connection
- A% o C0 T. y8 C+ H- `9 W; D* Ethrough moving part of class I( c! ?( T( Z# T; n+ V: _. ]0 e, C
motor
+ m5 x& I% E3 I1 t4 V, IKey words:
4 E& a" ~, @' G [ G. R- earth connection,3 m- D. W* w' i, E
- moving part
4 F% f8 X7 k, }% {) CDecision n.19 taken
' {8 \. t/ s# o- G1 r& gat 35th meeting/1998
( K9 G R: @. n3 i( }! J1 O, ?. [Question:
+ e( h& Z6 s) P: C5 lWe consider a class I tool employing a universal type motor. The motor shaft is2 [. s0 ^6 u5 U- E
conductively coupled to the earthed enclosure through steel ball bearings.
: Q8 |6 \! `9 g; U% ^In this case, shall the motor be of class II construction (motor shaft separated from the rotor* r; H: f7 q- W7 _ `- x
windings and commutator by double or reinforced insulation) ?
* q6 t# U) K( M2 A2 ADecision:4 V8 h: d! D% F* D* F2 V
Yes, the accessible motor shaft of a class I tool shall be separated from the rotor windings* B; N, H7 K' j4 J" F
and commutator by double or reinforced insulation (class II construction).* ` S& C1 f% }( i2 a4 x; |
/ q9 r: b" x$ C, t+ J
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