In North America..wires are standardized by GAUGE.....18,16,14,12,10 etc...
220v is used exclusively for HIGH AMPERAGE.....20, 30, 40 amp are most common usage for home and light industry
I have NEVER seen a 220v line smaller than 14 AWG (Note 16 AWG gauge is SMALLER wire than 14 AWG)
AMPERAGE will usually dictate which gauge you MUST use..
40-60Amp heavy commercial welder uses 10 AWG
A 30 amp line is VERY common for stoves..Dryers. large A/C.. it usually uses 14 or 12 AWG...
MY power cable for my Bitmain PSU's are ..
http://ca.mouser.com/Search/ProductDetail.aspx?R=VL-0124-05-200virtualkey68600000virtualkey686-VL-0124-05-200They are Hospital grade.. rated for 16Amps and 220v ....They have a C13 end for the PSU ..the other end I cut off and connect bare wires to my 30Amp line in a junction box
No PDU... NO plugs needed