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|  DSH 263
/ s7 }3 ~; P3 ^4 {% H! J% m0 F9 D" u! e8 ~
| Earthing connection through moving part of class I motor
4 N n- i' |( b% P! U. r8 [ | 19.11.2, 25.1 and 25.6
* } |) \. L1 ?0 _7 W$ J | 60745-1(ed.2) & 61029-1(ed.1)
# t! W" g1 z% o! g) c |
& X+ P' R8 R4 c/ LStandard: IEC 61029-1, Ed. 1 / IEC
" z( U! z+ @# b8 Y4 m6 E! u3 X60745-1, Ed. 2 ~) g/ a' l7 {: J$ P, I) d4 w
Subclauses: 19.11.2,
4 G( q1 }, Y+ }( {25.1 and 25.6; m. N5 F* e) v7 V
Sheet n 263
x, V8 h( B) X( [" ^! n4 q. oPage 1(1)0 A" S7 b- B; Z3 E7 g1 G
Subject: earthing connection
( e5 {0 p% R6 u9 A2 Lthrough moving part of class I
. u* H6 o% g7 a- l% N4 w' lmotor6 D4 F9 D8 G2 p( `+ X7 V
Key words:/ `" a* ^4 K. S( ^* Y6 L
- earth connection,4 o4 ?1 p# r% K, i
- moving part' \& F; B" s* M+ o* @( l1 @
Decision n.19 taken
6 H' d/ C C6 l, ~; K* rat 35th meeting/1998! t6 E' n; K/ o' T
Question:
" A5 q9 N1 h1 j/ t' ~% lWe consider a class I tool employing a universal type motor. The motor shaft is
: D0 x2 y; e/ Q/ mconductively coupled to the earthed enclosure through steel ball bearings.8 o6 t7 P$ R% L) _0 J5 v, {! ^* n
In this case, shall the motor be of class II construction (motor shaft separated from the rotor! d& s4 m& G4 s) Y$ R
windings and commutator by double or reinforced insulation) ?
8 _+ C% K* W3 n, w' b7 EDecision:/ a! d" f" ^( i0 M3 y
Yes, the accessible motor shaft of a class I tool shall be separated from the rotor windings* x# s3 d& o2 h C7 |8 w
and commutator by double or reinforced insulation (class II construction).
' K1 p, T+ A# H y$ H6 S$ O
- k6 e9 c! i, i$ C6 v$ Z0 i |
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发表于 2012-11-8 15:30
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