This is one of my first assignments as a co-op. I need to figure out what size SO cord to use to supply 460VAC at a 72A full load current. the total distance from 100 amp wall mounted disconnect to control panel/machine is about 75 feet. I looked in the NEC book and based on 100 amps (over estimate) the conductor size needs to be 3 AWG. Looking online, I find SO cord based on voltages and not current. I also need quick connects. I didn't know you needed quick connects when connecting power cord to breakers. Apparently I don't know enough about power, I'm excellent with coding though. Any information is appreciated. thanks.
First Q: 3ph? 3W, 4W, 5W?
Second Q: Where in the NEC did you see 100A rating for SO cord? Look at T400.5.A and B. For 3phase, #2 SO cord is only good for 80A.
Requirements for attachment plugs is in 400.7.B. The application may require quick connects. The code may not. Could be a design issue.
Crouse-Hinds, appleton make pin and sleeve plugs and and receptacles. Amazingly the C-H 100A plug will not take a 4C-#2 SO. The sheath is too big. Look at T400.5.B, type G or W, 75C, column F. #6 is good for 77A, #4 is good for 101A. For these types of applications, I've found G or W to be a better fit.
Several of the wire mfgs will have spec sheets on the web.
cf