[Amps] Question about safety ground connection

[Bill Turner]

I have a question about how to connect the safety ground from the AC mains.

I'm building a 1500 watt amplifier with a separate power supply. The 
power supply will connect to a 120-0-120 wall socket. My question is 
whether the "0" pin is considered a safety ground pin or a neutral 
pin. If it's neutral, then do I have to run a separate safety ground 
wire back to the AC mains entrance? Conversely, if it's a safety 
ground pin, am I allowed to connect a 120 volt load (blower motor) 
from it to one of the 120 wires? I suspect not, so does this mean the 
120 volt load will need its own separate 120v circuit (with its own 
ground), and is it ok to connect the two grounds together?

Comments appreciated.

73, Bill W6WRT