Portable Cord, used to make extension cords and power supply cords, is marked to let users know the exact type of wire they are dealing with.  The markings are universal in each country, and all wire should have them.  The information on the cords identifies the gauge, number of conductors, temperature ratings, volts, and type of material.  The make up of the wire is written in a series of letters, such as SJOW  or SVT.  This information also appears on the cardboard jacket that many extension cords are packaged in, which can be confusing to consumers unfamiliar with their meanings. Once someone knows...