|
引用第7楼追云于2011-08-11 11:51发表的 :; i* y( q4 |% N5 L2 I# K9 a: E+ Z, [
一个作用是防止炸裂有东西飞出,另一个是绝缘作用,保险丝金属部分与周围元件之间能够满足绝缘距离要求 對於第一個作用的說法現在不成立了.$ A8 F; |+ h2 n: ?: j
2009年以前 各安規機構的對於fuse 炸裂作法是現場目視工程判定,在加套管, 對於炸裂後不會產生安規危險的情況於接受.) \4 a9 {- z5 U* [& P
2009年以後 因UL PAG 對Fuse 炸裂情況從新定義: 凡是fuse 炸裂情況 都判定為fail .7 f" {" P# E9 j6 C2 m
$ X% b# C! w# ^; X* D# F
RELATED APPLICATION GUIDELINE(S): 2.5-2, 3.5-1, 3.5.2-1
3 Z, a! W9 {- b5.3.8-1 Bursting fuses T: S" `% {# Q h% _, [
.........
* Z8 K% }9 N7 e$ u8 qType of Issue: Technical6 \; b4 P, R0 s9 i# ~9 U
During fault testing in the Primary circuits of switch mode power supplies (SMPS) and other ITE,/ E; z! B: n- m2 R5 |, Q
sometimes a fuse that provides supplementary (non-branch circuit) overcurrent protection and
% Q4 P8 O) I) wthat complies with either IEC 60127 or UL 248-14 will burst while clearing the circuit% c3 i9 d$ A$ ]/ U$ w, A# Y
Is this an acceptable result and termination of the test?, g5 F8 r0 l7 w% J
APPLICATION GUIDELINE:
- U$ o8 ?: @" ?: U e4 AA fuse that bursts is not an acceptable result and termination of a test. |
|