A range that is under 12 kilowatts can be fed with 8-3 with ground cable and a 40 amp two pole breaker .. BUT .. that does not anticipate that the next range might be larger, SO I would use a 6-3 with ground cable and a two pole 50 amp breaker. The extra expence of the wire now is nothing compared to the expense of replacing it later.
Either installation would be using the same 50 amp 4 wire range receptacle.
Please vote !
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