I need to make a new control panel that contains alot of DC coils and feeds many external DC solenoids. I have most of the parts in our stores but the DC power supplies that i have is not big enougth to feed the circuits. Is it advisable to use 2 of the supplies that i have in the same panel or order 1 that is electrically big enougth. i.e if i was to use 2 would i need to common up the 0volts to avoid damage caused by accidently feeding a coil with the positive of one suppply and the negative of the other? Any views would be appreciated.