My 40 year old General Electric built-in range recently blew the main feed open (inside the range). It blew a hole the size of a dime through the sheet metal at the back of the range and also scorched the wall. It was #14 (!!!!) hi-temp wiring. The elements were wired with #16, also hi-temp. The breaker at the panel is 40A 240v. The feed from the breaker panel to the range is #8. I think I read 12.5kw on the range. All of this tells me that the main wire is working awfully hard. Sooooo - I went to the Servall appliance parts and found that they had #12 for main and #14 for elements (all hi-temp rated).
I also had my wife shopping for a new range but she couldn't come up with one to fit the opening, which meant a new range means a new kitchen at $25000 or so. We opted for the replacement range wiring.
Today being Thanksgiving, the range is getting a 7 hour Turkey Test, plus potatoes, dressing, casseroles, pies, you name it, we will be cooking it today. If the range holds together, I will be truly thankful.