[email protected] wrote: > > On the same subject, > > Where do you put the AC mains fuse relative to the "X" capacitor used for the > EMI filter? > > How does the "accross the line" safety rating of the capacitor affect this > answer?
For my specific requirements, (I can't speak for anyone else) it still follows that the fuse is first and any other component is downstream. > Specifically. Would you put an X cap in the unfused area of the AC inlet > like the EMC fellow wants? What about a "Y" cap? Absolutely not for X or Y. Is the X cap being used for the entire decoupling of conductive noise? If so, it sounds more like a physical location issue than an elecrical issue. Using a power entry module with line filter puts parts upstream from the fuse automatically. That I can't escape. And, those are X and Y caps. If one is constructing an AC input circuit from discrete parts, then placement can become critical for EMI. My 'basic' law is nothing upstream from a main fuse. The only time that is violated (which I really don't like) is, as I said before, with power entry modules w/filter. As was said by someone else, the fuseholder construction has to be such that removal of the fuse does not pose any danger to the person replacing the fuse. Therefore, I see no need to put a switch upstream from a fuse. That's assuming I have the choice. Please, bear in mind this is my perogative and others here may have different approaches that may well be entirely valid for their specific situation. I'm sure others will confirm this. ******************************************************* ------------------------------------------------------- The comments and opinions stated herein are mine alone, and do not reflect those of my employer. ------------------------------------------------------- *******************************************************
