My house took considerable damage to the roof and electrical supply to my home in a wind storm. The main breaker panel was in a sorry state and so while the damage did not technically reach the panel I took this as an opportunity to replace an old tired panel with hard to find parts with something that would be newer and hopefully safer. One issue was the electrician put like-for-like circuit breakers in the box, and that concerned me. There were obviously 20 amp breakers feeding 14 AWG wires. That is an issue I have already halfway rectified, not discovering this issue immediately at the time. To fix the other half I'm just looking for a good time to have a "spotter" on hand for when the main panel is open. I don't like working with 240 volts alone. Perhaps that's a distracting aside. I'll get to the oven outlet.
As the electrician was here he said something about a shortage of 40 amp breakers for my oven. I asked if a 50 amp breaker would be suitable. He agreed and so my oven is connected by a 50 amp breaker. The outlet is 50 amp but the wire is #8. Is this safe? Looking at ampacity charts it is safe if the insulation is rated to 75C. How do I know it is rated to 75C? I'm not opposed to running a new wire, I would just rather not have to run wire if not required.
I do not see an ampere rating on the oven. It shows 10 kW for 120/240, and 7.5 kW for 120/208. That can be used to derive an amp rating, and depending on how one runs those numbers one can get 40, 50 or 60 as the minimum rating. The oven was second hand and so there is no manual, and finding one has been difficult. I plan on some kitchen remodeling soon and so there will be a discussion on keeping the stove, and if it goes then the replacement will likely be gas over another electric.
I can see this going down some rabbit holes so I'll see if I can keep this simple. If I keep the oven then what, if any, wiring changes should I do? If the oven goes then I'd simply plan making what I have safe with minimal work and extra materials, as that would likely mean I end up with a gas oven. I believe city code requires an electric oven outlet in place, so a 40 amp breaker to #8 wire and a 14-50 outlet should be fine. I'll just install the box in the wall, rather than bolted to the floor as it is now, run the cable a bit more neatly to the main panel, and finish the drywall work in the basement so the cable is out of sight.
Any comments? Is the 50 amp breaker fine? Should I use 40 amps instead? Is 40 amps enough for my current oven? Should I plan on a 60 amp outlet for some reason?