Electrical Questions? Ask an Electrician Online.
Hi, I'm Mike G and I'll be assisting you. The first thing to do is disconnect all wires on the device. Test each pair for voltage black to white. If there is no voltage, go and flip the breaker. They sometimes don't show tripped when they are. Let me know if you then get voltage at the outlet.
Open the panel and verify the voltage on each single pole breaker.
Troubleshooting is a step by step process. Please do as asked to eliminate possible reasons for the issue.
OK, go back to the outlet and test each wire to ground.
Testing indicates an open hot wire connection ahead of the outlet you're working on. Being a hot wire it will be a little more difficult to locate. You'll need to open and check connections in outlets in the area.
Only is it has only the one outlet on it. You said all the single pole breaker were 120V. Did you check them as asked or not? If you did, your problem is a bad connection. If your outlets were wired using the pushback terminations and not the screws, that would be the most common reason for this type of failure.
If the wire leaving an outlet has the bad connection the outlet would work and the next one would not.
It's not the next outlet it's the one ahead of the dead one. Is your basement open? If so see where the cables come from.
Unfortunately as it is whit most electrical systems, at best you have a circuit directory at the panel. They are worthless for the most part. The only way to know what exactly is on a given circuit is to have a circuit map. A sheet of paper for each floor, all outlets shown in room sketches and numbered to relate to the breaker it's on. A map makes troubleshooting much easier. Not having one all you can do is keep looking.