IMO; it really depends upon which amp and preamp you are using. You never specifically mentioned that.
Many ARC products are made to be used with a 20 amp IEC power cord, is yours?
I would try plugging the amp into the wall outlet and then run a heavy duty extention cord to your preamp (using whatever connection adapters necessary) and listen for yourself.
As Yogiboy mentioned, if the breaker has not tripped then you should be fine however the system might sound better if the amp and preamp were on different circuits or dedicated circuits.
Many ARC products are made to be used with a 20 amp IEC power cord, is yours?
I would try plugging the amp into the wall outlet and then run a heavy duty extention cord to your preamp (using whatever connection adapters necessary) and listen for yourself.
As Yogiboy mentioned, if the breaker has not tripped then you should be fine however the system might sound better if the amp and preamp were on different circuits or dedicated circuits.