I have a situation very similar to using two oven in one outlet. I'd like to install a 30 amp GE Advantium 220v oven and a 20 amp GE thermal oven on an existing circuit with a 50 amp breaker. However, both installation manuals ask for dedicated circuits. Quoting the Advantium manual here: "Power should be supplied from a separate, dedicated 30-ampere branch circuit."
Ordinarily I'm a follow-the-instructions kind of guy, but I did notice that the manual used the word "should" in this sentence rather than the "must"s which were liberally sprinkled elsewhere. Pulling a new circuit is possible but a lot of work. I'd appreciate feedback from experienced DIYers or electricians. If I follow my instincts and install both ovens to the existing junction box with the existing 50 amp circuit, what risks am I taking?
Best Answer
You can normally connect 2 ovens on 1 breaker per the NEC but the manufacturer instructions over ride the NEC per 110.4.B , listed or labeled equipment shall be installed in accordance with any instructions included in the listing or labeling. This means you have to follow the manufacturers instructions. I agree with @JReaf that the control cycling of the elements in one oven may damage the controls in the second oven. We see this in industrial plants all the time and put spike suppressors (MOV’s or diodes on relays depends on if ac or dc) control. But with the mfg instructions stating they need to be on separate breakers a code compliant install requires 2.