30hp Rpc Vs 20hp Rpc?

just don't try to utilize the generated leg for control voltage from any RPC.
in other words you'd normally not hook up the generated leg of a rpc to power a:
transformer
magnetic contactor
relay (with the exception of potential relay)
control switch
(unregulated) computer controlled device or other sensitive unregulated electronic or other expensive devise you wouldn't want to loose by accident
 
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^^^ Great advice. ^^^

That generated leg isn't as smooth and has a "dirty" sine wave of you will. You don't want to mess up critical components if you can prevent it.
 
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