If I understand what you're saying, it shouldn't be possible.

Hypothetically:

If one wants to demonstrate that he needs a larger feed into the house, well one needs to connect things to all of the available circuits so that the main fuses blow without blowing the individual circuit fuses. (It's a good idea to have spare fuses around in case one's successful.) About a dozen 1200+ W hair dryers should do it (assuming the house has a 100 A "service" into the house, 100 A / (1200 W/120 V) = 10 hairdryers. Scale up the number of hair dryers as required for more current fed into the house.

It may be, though, that most of the 120 V outlets are limited to just a few of the smaller fuses, so that this technique may not work by itself. In that case, turn on the oven and electric clothes dryer too.

I wouldn't recommend actually carrying out such an experiment myself. If he wants upgraded house wiring, he should pay the piper and do it right, not build up a contrived circumstance.

HTH a bit.

Cheers,
Scott.