Hello...upgrading kitchen cooking appliances from a single electric range with a Microwave above(both are plug in) to a glass cooktop and separate wall oven/microwave combo oven. They will be located on the same wall in the kitchen, about 18 inches apart.
The combo oven is one appliance that consists of 2 components--the microwave is bolted onto the oven with machine screws. The micro component has a regular 3-prong plug, which plugs into a receptacle in the back of the oven component. They have separate control panels, and my hunch is they could be separated and installed independently.
The condo was built in 2002. There are 2-45 amp single pole (tied) breakers feeding the existing range, and the existing wire on the circuit is 6-3 with ground(4-wire) stranded Romex. The old microwave was on a dedicated 20 amp circuit on 12-2.
No more space in my panel to add another 40 amp circuit, so I'd like to run the cooktop and combo oven on the same 45 amp circuit. Nothing in the manufacturers' installation instructions preclude this.
The nameplate rating on the cooktop is 7200w; 6600w on the combo oven. I've done a bit of research and it seems the NEC has special considerations for allowing multiple cooking appliances on the same circuit. When I apply the math it seems I have adequate ampacity to run both on the same circuit:
7200w + 6600w = 13,800 / 240 = 58 amps x .65 demand factor = 37 amps
An alternative table allowing me to treat these as a single range yields a higher ampacity of 43. This calc is a bit more complicated, so hopefully I did it correctly.
Assuming above math is correct, is there any reason I can't proceed?
My plan is to connect both appliances to the incoming 6-3 plus ground in the same metal junction box to be located in the base cabinet between the 2 appliances. Oven is 4-wire, cooktop is 3 wire. Is it as simple as wire-nutting all like-colors together with a pigtail to a grounding screw on metal jbox?
Never worked with 240 before--all feedback appreciated.
Thank you,
Trish
The combo oven is one appliance that consists of 2 components--the microwave is bolted onto the oven with machine screws. The micro component has a regular 3-prong plug, which plugs into a receptacle in the back of the oven component. They have separate control panels, and my hunch is they could be separated and installed independently.
The condo was built in 2002. There are 2-45 amp single pole (tied) breakers feeding the existing range, and the existing wire on the circuit is 6-3 with ground(4-wire) stranded Romex. The old microwave was on a dedicated 20 amp circuit on 12-2.
No more space in my panel to add another 40 amp circuit, so I'd like to run the cooktop and combo oven on the same 45 amp circuit. Nothing in the manufacturers' installation instructions preclude this.
The nameplate rating on the cooktop is 7200w; 6600w on the combo oven. I've done a bit of research and it seems the NEC has special considerations for allowing multiple cooking appliances on the same circuit. When I apply the math it seems I have adequate ampacity to run both on the same circuit:
7200w + 6600w = 13,800 / 240 = 58 amps x .65 demand factor = 37 amps
An alternative table allowing me to treat these as a single range yields a higher ampacity of 43. This calc is a bit more complicated, so hopefully I did it correctly.
Assuming above math is correct, is there any reason I can't proceed?
My plan is to connect both appliances to the incoming 6-3 plus ground in the same metal junction box to be located in the base cabinet between the 2 appliances. Oven is 4-wire, cooktop is 3 wire. Is it as simple as wire-nutting all like-colors together with a pigtail to a grounding screw on metal jbox?
Never worked with 240 before--all feedback appreciated.
Thank you,
Trish
Replacing Electric Range and Micro with Cooktop and Combo Wall Oven
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