50Kva at 120v is 416amps..

so you have two hot legs.. your running 200amps so 100 on each leg as long as they are distributed evenly leaves you 3/4 load left over.(too the transformer). but if your sharing it with other houses thats not much.

The real question is what is your main breaker, and go buy a clamping amp meter, even your load over your two single phase legs and stay under 80% of your main breaker and you'll be fine.

Let me know if you need more info.

Thanks

Chicagoleo
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