DSH 402 General requirements

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DSH 402 % t) ]5 ^' ~7 X$ G  f5 Z

General requirements 9 x! V7 S+ s$ B5 h7 \; Y5 q

20, 20.1 A-a1)   K( S6 [" k# v! H. @

60601-1(ed.2);am1;am2 # g& l/ N, l8 }) F* q$ D: P

2 D0 t2 a( e4 t3 m5 WStandard(s)- (year and edition):
- p+ A! z. W5 J3 y8 ^3 fIEC 60601-1:1988 Ed.2 Am1+Am2
Sub clause(s): 20, 20.1 A-a1)
Sheet n°: DSH-402
- G1 h( }$ e9 D/ dSubject: General requirements
Key words: Basic insulation A-a1, intermediate circuit
3 Y; R; |- l- e1 N- z% D: h+ `Confirmed by CTL at its 39th meeting, in Cologne
4 p: ^4 Q) p# `6 G# N, J# ?Question:
The requirements in 20.1 would appear to apply also to intermediate circuits which may or may
not remain live after interruption of the protective earth conductor.
$ W3 b* h7 n: c& ^: y1 GShould A-a1) be applied also in those case where the intermediate circuit ceases to be live after
interruption of the protective earth conductor?
Decision:
Requirements for Basic insulation A-a1) should be applied only to those intermediate circuits
( @( _% t: Z5 T4 S( g6 awhich may be hazardous in single fault conditions.
6 k0 g/ t- r0 m

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