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I need to replace my electric cooktop in my kitchen. Old unit is 120/240 volts with a 30 amp breaker with #8 4 wire. Two hots one neutral and ground. Three number 8 wires and the ground looks to be #6.
Will the existing wiring work if I change out to a new 2 pole 40 amp breaker.
Have not bought the new cooktop unit yet but most that I looked at are 120/240 40amp.
Help.
Thanks
 

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8 gauge wire will support 40 amps. I have owned several electric cooktops and never had one requiring more than 30 amps. I don’t think we ever ran all the burners full blast at the same time, either.
 

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I had to upgrade my breaker from 30 to 40 amps for a new electric cooktop 2 years ago. I seem to remember from my shopping around most of the models available now required 40 amp. Unfortunately for me I had to run thicker cable from the breaker to the cooktop.
 
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