No, as the other poster pointed out, the US is 240 volts not 120 for this discussion. 120 volts is what you get to your general use outlets, but when we say a house in the US has 200 amps of mains service, we mean 200 amps at 240 volts, or 400 amps at 120 volts. The split to 120 volt happens in your mains panel after the main breaker.