I feel a bit dumb about this, but I'll continue. At 120-volts I want to load the breaker past it's rating to test that it trips. I set up 300-watt bulbs with 5 on the first switch.

1500W/120V=12.5A. Then switch on another 300-watt bulb for 1800W/120V=15A. Then I continue throwing switches until the breaker trips. Is this an effective way to load test? With inverse-time breakers what should the load be? ...and most of all...Is there something better than light bulbs???

Dave