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|  DSH 4029 V8 d& T. a2 [1 s( V/ V) w
% e! ] _& I3 V* m3 p2 F/ I8 ]% t | General requirements# K1 A$ [3 d( t3 E6 V5 `8 s
| 20, 20.1 A-a1)& |2 M1 s* s& T5 v. B& B, b1 Z8 G
| 60601-1(ed.2);am1;am2
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* f2 T9 i4 r8 z3 Y: `2 dStandard(s)- (year and edition):
L6 A+ c* {+ A3 V1 f+ K& M5 tIEC 60601-1:1988 Ed.2 Am1+Am2
$ n5 c! A1 G' u' Y& @Sub clause(s): 20, 20.1 A-a1)
/ B/ _+ O* _ W+ _Sheet n°: DSH-402
$ i% A) ^; A$ Q. d' m$ jSubject: General requirements
" Z+ B+ C, s* R. x6 XKey words: Basic insulation A-a1, intermediate circuit
* ?+ J+ t" O! } r( }Confirmed by CTL at its 39th meeting, in Cologne6 J3 t9 \) X4 Z% W2 m# @9 b
Question:
' N% f) J* U6 d: Q+ l+ UThe requirements in 20.1 would appear to apply also to intermediate circuits which may or may
% P( q% I; L! Y8 E8 Fnot remain live after interruption of the protective earth conductor.
, ?& I% q9 Y0 g m& kShould A-a1) be applied also in those case where the intermediate circuit ceases to be live after* @$ n/ M2 w) B: F3 r
interruption of the protective earth conductor?9 P) c5 N* X L5 R0 C$ B
Decision:
b8 e3 O) P( O$ J" Z+ Q- \8 h( oRequirements for Basic insulation A-a1) should be applied only to those intermediate circuits) T @+ O% R8 }$ G! N: G- Z- U
which may be hazardous in single fault conditions.3 t5 ?: N7 j; F/ V; v2 }
3 i! o9 @# Z; W$ X" f; b
3 a$ ?3 e% w# N. B |
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发表于 2012-11-5 11:48
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