Timeline for How to safely demonstrate backfeeding AC
Current License: CC BY-SA 3.0
15 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Nov 5, 2017 at 6:55 | comment | added | Voltage Spike♦ | That model is most likely more than 40MΩ, I personally would not call that low impedance. | |
| Nov 4, 2017 at 23:21 | vote | accept | RyGuy | ||
| Nov 4, 2017 at 23:16 | answer | added | user80875 | timeline score: 2 | |
| Nov 4, 2017 at 21:55 | comment | added | RyGuy | It could be induction, backfed is just what the sups called it. At the end of the day it's VAC that shouldn't be there. I'm using a Fluke 114 RMS which I thought was a low impedance meter which is why I wasn't thinking induction. That's part of the reason for this experiment, to see if it really is stray VAC that is causing issues. | |
| Nov 4, 2017 at 21:42 | review | Close votes | |||
| Nov 23, 2017 at 3:01 | |||||
| Nov 4, 2017 at 21:40 | comment | added | Voltage Spike♦ | Please explain "backfed AC" in terms of current and phase. Do you mean the device shunts some current to ground? If your picking up AC on coax , it could be that the coax is inductively coupling with an AC electrical line. Just because you measure 70VAC on the coax doesn't mean there is any energy behind that 70V as meters are high impedance. If you measured a reasonable amount of current (more than mA's) then I'd start to worry. If you want to block the 60Hz on a coax then get a filter | |
| Nov 4, 2017 at 21:40 | comment | added | user57037 | I read your whole post and do not really understand what phenomenon you are seeing or what might be causing it. Maybe some pictures/diagrams would help, to show how you hook up your meter and what you see. Also, I think you should add a diagram of your proposed backfeed setup. The verbal description was unclear to me. | |
| Nov 4, 2017 at 21:38 | comment | added | winny | It has been discussed many times before but the question varies although the answers where the same. You can start reading this one and I'll see if I can dig up a better one. electronics.stackexchange.com/questions/127104/… | |
| Nov 4, 2017 at 21:30 | comment | added | RyGuy | I'm not trying to make up any terminology. If I'm not using the right term you should correct me instead of saying I'm making something up. That doesn't contribute anything to the question or discussion. If it's what you say then wouldn't that be a similar demo? Feeding AC over a coax line into the network? | |
| Nov 4, 2017 at 21:21 | comment | added | winny | Still very unclear and made up terminology. Sound like you are seeing the Y-caps of ungrounded equipment dividing the AC line voltage to the chassis. | |
| Nov 4, 2017 at 21:15 | comment | added | RyGuy | Charles thanks for your response. I've edited my question to add further detail | |
| Nov 4, 2017 at 21:14 | history | edited | RyGuy | CC BY-SA 3.0 |
more explanation given
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| Nov 4, 2017 at 21:03 | comment | added | user80875 | What is your definition of "backfed AC" and why do you want to demonstrate it? I can not picture what you are proposing to do. You will probably need to draw a diagram. | |
| Nov 4, 2017 at 20:57 | review | First posts | |||
| Nov 4, 2017 at 21:41 | |||||
| Nov 4, 2017 at 20:55 | history | asked | RyGuy | CC BY-SA 3.0 |