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

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DSH 428

Insulation between an F-type applied part and enclosure * C' N+ S# e" E/ Q: C

20.2 B-d and B-e " T/ k6 k' J$ ~5 {6 Q) r1 ~7 p

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

Standard(s)- (year and edition):
IEC 60601-1:1988 Ed.2 Am1+Am2
Sub clause(s): 20.2 B-d and B-e
Sheet n°: DSH-428
. W) d# U% u$ K4 g' Z; ^9 T" q" HSubject: Insulation between an F-type applied part and enclosure
Key words: F-type, applied part, enclosure
Confirmed by CTL at its 39th meeting, in Cologne
6 j% C3 m$ ]5 r! MQuestion:
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.
9 i* T" J* a5 ^$ `7 K) h, k2) B-e refers to “voltages stressing the insulation”.
& K$ S5 J% b8 p( I6 jWhat is a hazardous voltage stressing an insulation?
Decision:
- V- j+ T9 P9 g/ EB-d is always applicable for a F-TYPE APPLIED PART. U equals maximum RATED SUPPLY
VOLTAGE; or, 250V for INTERNALLY POWERED EQUIPMENT. BASIC INSULATION
required.
In addition B-e is also applicable if there is a voltage in the F-TYPE APPLIED PART. U equals
the voltage stressing the insulation in NORMAL USE including earthing of any PATIENT
/ N1 e6 b2 p1 l! ^4 D! FCONNECTION.