George never worked in the computer biz. 60 and 100a 3p Russell Stoll plugs or IEC309s are very common under the floor. Back in the 20th century a decent sized tape drive controller (3803) would have a 100a plug on it. Want to hear the silly thing, they also had 14ga cables going out to the drives protected by the 100a breaker in the machine. I raised hell with IBM about it but they just said U/L listed it. It must be OK.
My worn out old war story about the flaming cable was on this machine.
