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

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DSH 428 " ~9 G) l* Q4 m

Insulation between an F-type applied part and enclosure ; J2 Q" F2 n% m) P- e6 h

20.2 B-d and B-e

60601-1(ed.2);am1;am2 . o3 x/ C/ {9 N2 V1 U' m+ c5 k# w

Standard(s)- (year and edition):
5 O9 [! ~( u, ]; FIEC 60601-1:1988 Ed.2 Am1+Am2
Sub clause(s): 20.2 B-d and B-e
9 g* T/ Y0 w5 R/ I$ ESheet n°: DSH-428
) C, U, e1 w; g$ h$ k9 s- T$ L  t- ZSubject: Insulation between an F-type applied part and enclosure
; |! Z: \8 }# w4 j5 NKey words: F-type, applied part, enclosure
Confirmed by CTL at its 39th meeting, in Cologne
Question:
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.
% |# _" D3 I3 \' O/ F2) B-e refers to “voltages stressing the insulation”.
What is a hazardous voltage stressing an insulation?
, o( k' [  @; T4 s; Q: s' _Decision:
B-d is always applicable for a F-TYPE APPLIED PART. U equals maximum RATED SUPPLY
VOLTAGE; or, 250V for INTERNALLY POWERED EQUIPMENT. BASIC INSULATION
4 _- T5 D# c% J2 s3 ^+ U6 Z+ Crequired.
+ ^# R+ E1 Z8 f$ l" I) A9 F! IIn addition B-e is also applicable if there is a voltage in the F-TYPE APPLIED PART. U equals
; y8 M2 C. @8 G- D! ^the voltage stressing the insulation in NORMAL USE including earthing of any PATIENT
8 O$ E" c. d9 M/ h8 ~CONNECTION.
+ v5 p% \8 x" B1 ~* o

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