[AMRadio] 220 vac line

[Rick]

I'm sure this has been discussed but my memory refuses to let the info go. I
am wiring a 220 VAC line into the new shack and I am uncertain about the
neutral and ground wires. I installed a new sub panel complete with
isolation buss bar for the neutral (white) wire from the 220 outlet. The new
sub panel has the neutral buss bar grounded to the main panel ground buss
bar. This is the way I understand it is supposed to be. The outlet I am
installing is a 20 amp 3 wire (two hot, one ground) unit. My concern is, do
I use the bare ground or the white neutral wire for the ground lug on the
outlet? Also, do I simply leave the unused of the two (white or bare)
disconnected in the new sub panel?

Thanks for any assistance and advice.

Rick / K5IAR