No you can have more then 30a on a two wire system. You just need to use bigger wire. A dryer can run on two wire 40a and a stove on two wire 60a
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Originally Posted by dieseljeep
Get the electric utility to come and check it out.
The owner might be mistaken about the service entrance. I don't know of any homes that still have a two wire 120 volt service. They only were good for 30 amps, max.
The 1959 code required a minimum 120/240 volt, 100 amp, three wire service, for residential applications. It didn't make any difference, how many circuits were used. I've seen 100 amp services, that only had, two 15 amp 120 volt branch circuits. They owner did it to satisfy the insurance company.
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