Originally Posted by StoneyG
I finally got to a trusted technician and added a breaker to separate the washer and dryer from the center AC and had him test and balance the load. We can now run everything at the same time showing about an 80 amp load which is beyond what I had thought possible. I still don't know why 100amp service is called 50 amp service. Thanks for all your help.
50 amp service max current each of two legs, providing 100 amps of service in parallel, not additive. I.e. You can't apply 60 amps on either branch, it will trip at 50 amps. That's why it's important to keep the two phases in balance or even load.
Therefore "50" amp service" is truly three times the capacity of single phase 3 wire "30 amp service".