I did this in my room: but I think there is still something wrong with the wiring. (I don't think a real electrician set it up). Lights dim when the computer is under a lot of load. Need to inspect junction boxes (some hidden!) for signs of things getting hot.
@@ToolboxLife Hmm the neutral connection in that switch box DOES look a little sus (small wire nut, wires not twisted, no browning though). I think I will go through the junction boxes I can easily access before running a long-running computation. It is also possible that my 1200W PSU just draws transients in the 100A range. *Update:* The "sus" wire nut was a correctly installed 3 piece clamping style (only the screw in the ring is twisted). Both duplex outlets were installed with pointy screws (one even pierced the outer covering of the romex) but they were non-factors. Light fixture felt a little warm for running a 9W bulb, I tightened up the wire nut on the neutral a little bit. If I assume the junction was drawing 8W (no browning) that is about a 2V voltage drop at the 4A I expect my computer system to be drawing. That works out of 0.5 ohms. A 100A transient would cause a voltage drop of 50V (70V brownout at 120V). I re-ran "Furmark", which was known to make the lights dim: and I *think* the problem has been mostly resolved. There is still some dimming: but hard to know how much is to be expected from a long wire run (suppose I could calculate that too).
I did this in my room: but I think there is still something wrong with the wiring. (I don't think a real electrician set it up).
Lights dim when the computer is under a lot of load. Need to inspect junction boxes (some hidden!) for signs of things getting hot.
Bad neutral somewhere, most likely
@@ToolboxLife Hmm the neutral connection in that switch box DOES look a little sus (small wire nut, wires not twisted, no browning though).
I think I will go through the junction boxes I can easily access before running a long-running computation.
It is also possible that my 1200W PSU just draws transients in the 100A range.
*Update:*
The "sus" wire nut was a correctly installed 3 piece clamping style (only the screw in the ring is twisted).
Both duplex outlets were installed with pointy screws (one even pierced the outer covering of the romex) but they were non-factors.
Light fixture felt a little warm for running a 9W bulb, I tightened up the wire nut on the neutral a little bit. If I assume the junction was drawing 8W (no browning) that is about a 2V voltage drop at the 4A I expect my computer system to be drawing. That works out of 0.5 ohms. A 100A transient would cause a voltage drop of 50V (70V brownout at 120V).
I re-ran "Furmark", which was known to make the lights dim: and I *think* the problem has been mostly resolved. There is still some dimming: but hard to know how much is to be expected from a long wire run (suppose I could calculate that too).