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

20.2 B-d and B-e * s! h6 V! R4 W# O# l; h+ J

60601-1(ed.2);am1;am2 - r% ]; F- ~  Y0 o( e

) D3 |3 L- S* l+ \4 hStandard(s)- (year and edition):
IEC 60601-1:1988 Ed.2 Am1+Am2
- n& W( j: ]; @! g" [; ~0 r* ^3 eSub clause(s): 20.2 B-d and B-e
7 ?# ]! B$ S# T( T9 s2 TSheet n°: DSH-428
Subject: Insulation between an F-type applied part and enclosure
0 p) _9 ?! Q3 I- W+ }$ SKey words: F-type, applied part, enclosure
; M9 A' r3 n( O; S, qConfirmed by CTL at its 39th meeting, in Cologne
" C' G! i( |5 n' V' K' SQuestion:
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”.
What is a hazardous voltage stressing an insulation?
Decision:
* z! b9 N% T  O- Q2 Z* s' _' |* T6 WB-d is always applicable for a F-TYPE APPLIED PART. U equals maximum RATED SUPPLY
' X1 M/ X* r  W' j2 YVOLTAGE; or, 250V for INTERNALLY POWERED EQUIPMENT. BASIC INSULATION
1 `* [, w# x5 d, Xrequired.
/ j2 n* G+ z5 S: w1 [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
! P0 Y! w1 }6 F. Z, }CONNECTION.

) J! B9 ^: ]2 m% r2 T2 l+ W$ r