Something else you may want to look at is the breaker. Most houses came with poor quality GE or Cutler-Hammer (or any number of other brands) that are overly sensitive. My house is an older one with too few circuits and had GE breakers. My loads seemed to be almost within limits, but still I had a lot of tripping. I changed out the breakers to all Square-D brand and most of the tripping problems went away.

I engineer fountains for a living and Square-D is the only ground fault breaker one can put the load 500 feet away and not have it trip.