DSH 263 Earthing connection through moving part of class I motor

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DSH 263 7 w1 ?6 ]1 q: z# |0 x- d 7 u3 B# q+ E- W3 j

Earthing connection through moving part of class I motor 9 B( u/ Q* C% a% _9 @

19.11.2, 25.1 and 25.6 , \& p2 y& J0 O7 ^5 F

60745-1(ed.2) & 61029-1(ed.1) ( `8 e7 q! z0 [# W

2 v8 B- H. p; h' kStandard: IEC 61029-1, Ed. 1 / IEC
& e5 X8 T6 W3 p: ]: V0 D: i" F  H8 Z60745-1, Ed. 2
: K7 n1 X. y/ ]3 gSubclauses: 19.11.2,
25.1 and 25.6
+ ^* p" s; O' ^7 f3 U; eSheet n 263
  h9 n* f: Q8 X9 ]. {3 X. ]- ?Page 1(1)
Subject: earthing connection
" \8 H3 B5 C0 V( y% d( _2 w3 Athrough moving part of class I
motor
Key words:
, k1 U3 c% T; y3 z- earth connection,
- moving part
* n. {6 J  }, i$ N& G9 \8 @Decision n.19 taken
at 35th meeting/1998
& e4 q1 m& m% L6 cQuestion:
We consider a class I tool employing a universal type motor. The motor shaft is
conductively coupled to the earthed enclosure through steel ball bearings.
1 A$ ]0 ]# ~% r: |% ]0 rIn this case, shall the motor be of class II construction (motor shaft separated from the rotor
windings and commutator by double or reinforced insulation) ?
8 b) _! b5 `9 z/ _$ e* y  aDecision:
1 d/ g- `. x5 t4 d- F" E+ y9 f/ S& xYes, the accessible motor shaft of a class I tool shall be separated from the rotor windings
* D- P4 y, B2 Q  [9 \7 _* I/ ~3 j1 qand commutator by double or reinforced insulation (class II construction).

2 T5 p! ^; N! M( a