This is an extension on a previous question about a 240V outlet in my garage.
At that time, I took the advice that I should:
- replace the 40A breaker in the garage with a 30A version (from the proper manufacturer)
- replace the NEMA 6-15P outlet (240V 15A) with a NEMA 6-30P (240V 30A)
- make sure the electrical cable is at least AWG 10
However, I stopped the project and never actually ran the intended electrical heater because of what I found at the other side (i.e. the panel in my main house)...
The breaker that leads to the garage appears to have been altered. In particular, it looks to me that the rating number has been etched in by hand and reads
15A. Is it common practice to etch in a current rating? Could this really be a 15A breaker (this is what worried me, and why I never plugged in the 20A heater)? Can I replace this with a 30A breaker to power intended setup shown below?