The IEC connector on the 20a cord is about 50% larger and has a different pin orientation than the 15a IEC variety and is usually only used on very large amplifiers....The wall plug on the 20a outlet has a different orientation as well and must be used with a 20a wall socket. Funny thing about the wall sockets and the wall plugs is they (20a) appear to have exactly the same pins/sockets as the 15a variety, just oriented differently......
