After reading my post I should make it clear that the 30 amp outlet does not directly feed servers.
Typically the L6--30R feeds a UPS like
this , from there the power will go to a small
Power Distribution Unit out of the PDU with IEC 320 C13 power cords to the hubs, servers etc. all at 208 volt.
Is it possible that using 208 volt instead of 120 volt helps to lessen the problems with non-linear loads?
