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|  DSH 4028 a$ I/ R h' u
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| General requirements
% x" T" d. f& i | 20, 20.1 A-a1)$ a7 \/ a( j E y
| 60601-1(ed.2);am1;am2% W& |9 z) x& \& n
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3 i0 T2 h" B/ j- V+ k( ~Standard(s)- (year and edition):9 C0 x) l- k' s/ ^) t6 z: u/ j
IEC 60601-1:1988 Ed.2 Am1+Am2
5 j" D5 b/ r' m. Z; w1 ]2 [Sub clause(s): 20, 20.1 A-a1)- ?/ p& D# V+ o) q9 X8 d! _# K) \
Sheet n°: DSH-402
1 T7 \/ Q8 T0 i( s6 u+ zSubject: General requirements
* s! p- w! V% R% X$ r, C: g, [Key words: Basic insulation A-a1, intermediate circuit
9 W. ^ a. s! j3 Z: u+ {Confirmed by CTL at its 39th meeting, in Cologne
$ X( k! z2 w( b0 o9 J! _Question:
* A7 d" {% R/ c h* Q4 T# C: L, v- OThe requirements in 20.1 would appear to apply also to intermediate circuits which may or may7 i4 t7 [3 q3 W C' Q0 [! K D. K
not remain live after interruption of the protective earth conductor.4 I& y* b6 L5 c! M5 b$ Q/ A
Should A-a1) be applied also in those case where the intermediate circuit ceases to be live after1 _. U1 q6 B I) \* I" T: H; s
interruption of the protective earth conductor?3 |. A0 W$ `% c+ b- h
Decision:! e* J$ K. M( ~; j5 X8 _6 k5 l# {
Requirements for Basic insulation A-a1) should be applied only to those intermediate circuits
/ M; g7 _2 w/ R3 r/ r* o7 N8 Gwhich may be hazardous in single fault conditions.
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发表于 2012-11-5 11:48
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