DSH 428 Insulation between an F-type applied part and enclosure

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DSH 428 ) }& m- t' J9 B, F( I3 ]% R6 t! r

Insulation between an F-type applied part and enclosure % ]4 ]) s! J7 {6 m) L; M  s( `, q4 x

20.2 B-d and B-e

60601-1(ed.2);am1;am2

+ t# Y3 ?6 R" N/ {' E* tStandard(s)- (year and edition):
) o1 v* l3 x% l0 F& {# C7 w" J/ ~IEC 60601-1:1988 Ed.2 Am1+Am2
8 p2 w: c# I7 h$ @# G" HSub clause(s): 20.2 B-d and B-e
, i  U/ q9 y; zSheet n°: DSH-428
  M+ j/ ^1 Y7 jSubject: Insulation between an F-type applied part and enclosure
  E' E! s8 t# k9 W( e% |2 HKey words: F-type, applied part, enclosure
& U+ t% Z$ W/ t" [* G* |; j& yConfirmed by CTL at its 39th meeting, in Cologne
; @) R3 Y: l3 u% w( c; }( KQuestion:
1) Different interpretations may occur about whether to use B-d or B-e to state the correct
insulation level between an F-TYPE APPLIED PART and the ENCLOSURE.
2) B-e refers to “voltages stressing the insulation”.
; y2 X  o  v) l- iWhat is a hazardous voltage stressing an insulation?
: I$ h8 ]( [0 ], e; S$ A+ X( WDecision:
' h1 Y8 A" G* ]B-d is always applicable for a F-TYPE APPLIED PART. U equals maximum RATED SUPPLY
3 g) X  D9 n+ b/ fVOLTAGE; or, 250V for INTERNALLY POWERED EQUIPMENT. BASIC INSULATION
required.
3 O. d3 w7 ]5 p7 c: X1 UIn addition B-e is also applicable if there is a voltage in the F-TYPE APPLIED PART. U equals
5 L( s$ Z; p4 e8 Z! mthe voltage stressing the insulation in NORMAL USE including earthing of any PATIENT
) y" S% K5 f% @, aCONNECTION.
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