Pro tip: always check the panel schedule, even if you think you know the building

I was working on a small office rewire in Tacoma last Thursday, adding some new circuits for a remodel. The main panel looked fine, but I needed to pull from a subpanel in the back. I glanced at the schedule, saw a breaker labeled 'Lights - West Hall' and killed it. Started pulling the old wire and got a solid zap. Turns out, the guy who labeled it twenty years ago mixed up the hall and the manager's office, which had a dedicated computer circuit. The schedule was a lie. I had to shut down the whole subpanel, which meant the whole back office lost power for an hour while I sorted it. My hand was buzzing for the rest of the day. Has anyone else been burned by a bad panel label from a long time ago?

3 comments

3 Comments

oliver21mo ago

The Tacoma story is a good warning, but I trust my own testing over any old label. A quick tick tracer check before you touch is the real pro move, isn't it? That habit has saved me more times than a perfect schedule.

paigep201mo ago

Totally agree with the tick tracer check... that's non-negotiable. I've seen a panel labeled dead that was still hot on one leg because of a shared neutral from another circuit. The label said it was safe, but the tracer didn't lie. It takes two seconds and becomes pure muscle memory after a while. Relying on the schedule alone is how you get a really bad day.

hugo_schmidt1mo ago

I used to trust labels too, but @paigep20's story about that hot leg changed how I work.