first time poster -- i have a kitchen in a vacation home (in california) with an ancient GE convention wall oven (220V 50A) and a, similarly ancient, propane cooktop with down draft venting system. The downdraft fan connects to a standard 120V/20A outlet under the counter. For several good reasons, I would like to switch to an electric cooktop and can switch out the oven at the same time. Most wall ovens and electric cooktops require 30A breakers. First, is it acceptable (code-wise) to gang both units off the same 50A breaker, assuming I can find an oven and cooktop with less than 50A draw combined ? Second any ideas on combos that would meet this requirement ? I've seen a GE oven at 20A (but very expensive) and i've seen 2 burner electric cooktops at 20A, but I really need 4 burners in the cooktop. Any ideas or advice appreciated.
You might want to look at induction cooktops. They use substantially less power than conventional electric cooktops for a given amount of cooking capability. A 4-unit cooktop in 30A might be possible with induction. Generally, however, you will need separate circuits (or at least separate overcurrent protection devices) for each appliance.
You are permitted to supply both a cooktop and a wall oven from the same 50 Amp circuit. Mount a junction box somewhere in the vicinity of both appliances, and connect their pigtails in.
There are special rules in the Code about such installations. See NEC 210.19(A)(3). You are allowed to connect a 20 Amp appliance to a 50 Amp circuit without further overcurrent protection under these rules.