Fourth sound recording: "power"

This was an interesting sound to me as I walked by simply because I had never heard it in a recorded format before. I am sure everyone has heard it at one time or another; the buzz from a power box. However this recording I felt was interesting because of the construction ambiance in the background. I feel the steady hum from the power box gives this recording something unusual; without it, the recording wouldn't be anything out of the ordinary.
Listen to the sound here.