|
| DSH 416: b$ k: ~, r, O- b
; |4 B7 p4 M" q3 X. O" o4 b+ M
| Leakage current of floating circuits
! L" C& V- Q7 g' H: a. R | 20, 20.2, k% @& i7 G( j: `9 s5 H
| 60601-1(ed.2);am1;am2
# X5 P+ N# ]% E+ F) D6 U1 D# A | 7 z+ e& m' O/ _, r# e! h* q
Standard(s)- (year and edition):
) n- ?8 I e" s' FIEC 60601-1:1988 Ed.2 Am1+Am21 C& e% j7 X& L3 S; c m0 ?
Sub clause(s): 20, 20.2
9 A; F. g( ? C9 Q: jSheet n°: DSH-416
) g8 _7 y2 U9 R# e8 oSubject: Leakage current of floating circuits
4 |; m" r8 S* cKey words: Floating circuits, leakage current
2 e7 w6 Q5 K3 v* Z" U9 EConfirmed by CTL at its 39th meeting, in Cologne
6 x B6 c9 j, TQuestion:% }+ a# \' c0 O. H
EQUIPMENT may contain floating circuits which under the definition 2.1.10 would not be8 Z4 n2 a5 J: [: [" z! x
considered as LIVE, since contact with these parts could not result in excessive leakage
7 W: T3 \) v6 _1 T5 J. r2 acurrents to earth or to other ACCESSIBLE PARTS. There would therefore appear to be no5 z- O9 ~& B. k- i5 i- T
requirements for safety separation between these circuits and ACCESSIBLE PARTS or4 S0 w6 C/ C5 @5 k8 T4 g1 w
APPLIED PARTS. But voltages within these circuits or in conjunction with other circuits may" `8 h: u9 {9 { k* n" }# G
lead to currents exceeding the values given in Table IV.. U# \' e9 H% i# S
Decision:
" w2 u6 S/ Q3 P. r- C. wIf the failure of insulation of such isolated circuits is likely to lead to a SAFETY HAZARD, such& q' p! s/ K2 k/ P
insulation should be short-circuited before determining whether a part is LIVE. This shortcircuit9 H+ U, D. e( e( H/ w
should not be treated as a SINGLE FAULT CONDIT ION unless the insulation: K9 d& E t2 z( o1 ]5 Z F% i
concerned satisfies the requirements for BASIC or SUPPLEMENTARY INSULATION, K% Z: w7 |# P a
necessary for the voltages within the isolated part.. Q: e1 Z% E0 X- y8 T" Y5 }! X1 e
% f# u# C$ q; \4 n& E
* r2 u6 f& i6 o5 B+ p" l |
本帖子中包含更多资源
您需要 登录 才可以下载或查看,没有帐号?注册安规
x
|