A portable cord is an electrical cable that is flexible and transportable and is made up of one or more insulated conductors encased in a jacket. It's most commonly used for making temporary power connections. Temperature fluctuations, grease, chemicals, and abrasive materials can all cause continual flexing and adverse environmental conditions in portable cords. There are several different types of portable cords, each of which is identified by an industry standard letter code that describes several characteristics (temperature range, wire size) and ratings (voltage) to ensure the optimal cord is chosen for a given application. Portable cord is often used in industrial and commercial facilities for temporary wiring operations, such as powering portable tools, appliances, and equipment, as well as tiny motors and associated machinery. It excludes the plugs at the ends of the wires.