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 + {6 U" _* a% ~& `8 W7 {2 S- M! X

20.2 B-d and B-e 9 D7 ?) C. `& f( d; r$ _1 s5 F

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

1 I) m4 I+ X+ F. nStandard(s)- (year and edition):
$ u/ X; U2 D: T: |, I. ZIEC 60601-1:1988 Ed.2 Am1+Am2
+ b7 w) Q1 a8 x; bSub clause(s): 20.2 B-d and B-e
Sheet n°: DSH-428
! C/ F  b" y) x, H2 xSubject: Insulation between an F-type applied part and enclosure
+ Z# i5 b* x) z$ U- `Key words: F-type, applied part, enclosure
0 T% X$ @8 M# h4 A! ^- o; gConfirmed by CTL at its 39th meeting, in Cologne
4 |6 a; U. T# R/ ]" VQuestion:
: ^) e9 O- \5 \) g* X; W* ~1) Different interpretations may occur about whether to use B-d or B-e to state the correct
+ `& f7 p/ ~3 F* s' M$ X* U. a3 U( Hinsulation level between an F-TYPE APPLIED PART and the ENCLOSURE.
$ c/ A  ~) Y) E# A) b/ o. ~2) B-e refers to “voltages stressing the insulation”.
  \/ U0 r# q1 }; {" PWhat is a hazardous voltage stressing an insulation?
/ K% a6 _6 \/ ^0 rDecision:
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
required.
4 k$ g2 S1 Q- o, g2 \3 pIn 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
8 E( @9 \4 p$ X/ vCONNECTION.

4 N! h+ {4 A/ s  W  P$ w' l