On Monday, May 28, 2018 at 12:38:46 PM UTC-4, Uncle Monster wrote:
On Monday, May 28, 2018 at 9:20:46 AM UTC-5, condo owner wrote:
I turned off ALL circuit breakers in the panel.

I then pulled out the duplex receptacle from the electrical box in my garage and removed the wires.

I then attached the black, white and ground wires to a new duplex receptacle with two USB ports.

I was shocked by another white electrical wire in the box. Why wasn't that circuit controlled by a circuit breaker in the panel? Should the white wire have power?

There is a possibility that the white wire is part of a light switch leg. I would often use the "Jesus Method" to find circuit breakers. If there was a hot wire in a junction box that was a mystery, I'd short it to the ground and yell, "JESUS!" as it made a loud electrical arc sound. Then I'd go find the tripped circuit breaker and make note of it. ^_^

[8~{} Uncle Trippy Monster

That would not explain why it's hot with the disconnect open.