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In Reply to: RE: Some fiddling and some discoveries... posted by jea48 on November 06, 2016 at 19:47:40
Yes, I did delete that post. After Shovel's comment on the amp rating of the IEC filter, I went back and looked at the spec sheet. And looked at it wrong - I didn't pay attention to the fact that it was a general spec sheet for several different models. Shovel (and you) were right, I wasn't, and as nobody had responded at that point I deleted the post rather than add unnecessary confusion to the mix.
Thanks for the detail on the amp rating. I just learned something. I thought the fuse needed to cover the amp draw of the transformer secondaries, which is what I was basing calculations on for MY power supply. Looks like I need to go back and recalculate! Greatly appreciate the explanation.
Follow Ups:
bcowen,Thank you for posting the schematic diagram for the IEC/switch/fuse/filter unit.
http://www.audioasylum.com/audio/tweaks/messages/20/202695.htmlIt helped a lot, at least for me, to know what all the thing did.
I still wonder if the safety equipment grounding conductor travels/passes straight through the thing.
Also I would have never thought it had a double pole single throw power switch, DPST.
As for the fusing of both incoming lines. The schematic diagram shows a jumper through the fuse clip on the neutral Line. That indicated to me a fuse should not be needed on the 120V unit. A neutral should never be fused. It can be dangerous in certain circumstances. What I don't know for sure is what the OP has. He could just pull the fuse on the N, neutral, side and check for continuity across the fuse clips.
I believe the unit is designed to be used on 240V as well as 120V power systems. That would explain the DPST power switch and both hot AC power lines fused. The thing is the 240V mains would have to be both Hot ungrounded conductors. Maybe for a Europe 240V balanced power system...
Jim
Edits: 11/07/16
It is designed to go to 240V. Maybe the medical uses require 240? Dunno. Either way, it seems to be a great solution for plug, filter and power switch all in one.
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