Sub Panel Troubleshooting

Hi all,



Had some issues with my sub panel tonight.  The sub has tandem 20A breakers to feed my Home Theater in the basement.  We were watching tv on the projector when my whole AV rack went dead.  I was able to track it back to the sub panel.  Forgive me if my terminology is not correct on the description....Turns out the top bus bar? has no power. (The one that the red wire feeds)  But when I trace that red wire back to the main panel it sees 124V.  The bus bar that the white wire is connected to sees 124V.



As in the picture below, the breaker on the left has no power but if I swap it with the one on the right it works.



Why would that top bar not have any juice to it?




      


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Hello! Great help here. I did a search and could not find a solution to my problem so I had to make a new thread.



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Hey everyone - question about home wiring that was done when the house  was built about 20 years ago (which putting it delicately...is very  shoddy at best).  I'd like to think of myself as fairly knowledgeable in  basic home wiring...but this one has me baffled and I really hope  someone can help.



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Hi all

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A friend also told me to double-check to make sure that the black wire feeding power to the light was indeed the hot wire, and it is.  If I touch it with the black test lead from the multimeter and put the red one to the neutral I show 120 volts. If I keep the black test lead on the black wire and put the red test lead to the ground - I also show 120 volts.



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So how am I getting 120 volts from this wiring, according to my multimeter, yet it won't light up ANYTHING and keeps giving off the indication that some kind of loop or short is being created every time I actually plug a light into the track? It's got me totally stumped.



Anyone have any ideas?
      
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