Years ago, after having a 20A switch blow up in my face because I shorted out a 30A breaker, I quit using this technique (which I preferred over just sticking a wire into a receptacle) and bought a circuit tracer.
The switch had become weak with many uses, and it seemed like a "better idea" at the time...
The carpenter who replaced the 20A breaker with a 30A to keep his emglo compressor from shutting off on start-up, got the back of his hand slapped by me...
The guy was twice my size and thought my boldness was the funniest thing ever...
I guess I thought I was invincible back then...
Wow, live and learn...
