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|  DSH 428
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| Insulation between an F-type applied part and enclosure
& @0 F* B" J3 X" ]2 F# j4 A% j | 20.2 B-d and B-e
' ]8 \2 M1 X! _$ L1 \ | 60601-1(ed.2);am1;am2
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Standard(s)- (year and edition):
; q- V! X( N( N5 S/ Q' tIEC 60601-1:1988 Ed.2 Am1+Am2# O1 @0 ^$ Z* H: b1 L$ ]$ ^$ W) }
Sub clause(s): 20.2 B-d and B-e
' G+ F v" [! z1 z9 a2 KSheet n°: DSH-428( H0 V+ ~1 R) x
Subject: Insulation between an F-type applied part and enclosure
; C6 B9 F$ ~+ G" h2 mKey words: F-type, applied part, enclosure* y `4 D# s5 {7 ~( {
Confirmed by CTL at its 39th meeting, in Cologne
$ P7 i: }6 ]: X! O5 \) PQuestion:
. J5 b: {9 G6 V! G1) Different interpretations may occur about whether to use B-d or B-e to state the correct- D: L( Q$ Y1 l1 U
insulation level between an F-TYPE APPLIED PART and the ENCLOSURE.
$ [& q$ |$ y& d8 L5 Z' m" w2) B-e refers to “voltages stressing the insulation”.
3 \9 a, `6 _9 V( \# `4 wWhat is a hazardous voltage stressing an insulation?
* q# `8 `; z5 s. w& VDecision:6 [9 \; C6 V. ]3 |! T
B-d is always applicable for a F-TYPE APPLIED PART. U equals maximum RATED SUPPLY, \9 a% b+ n; l1 R, Y0 J
VOLTAGE; or, 250V for INTERNALLY POWERED EQUIPMENT. BASIC INSULATION
" O3 z" y/ `! m4 O' N& krequired.+ G. O O4 V: P: o
In addition B-e is also applicable if there is a voltage in the F-TYPE APPLIED PART. U equals
( T& g) R+ V8 d" w3 N$ D& L8 x" ^8 mthe voltage stressing the insulation in NORMAL USE including earthing of any PATIENT
% [* O0 D' N' N. D" HCONNECTION.
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