Wires are basic parts of every electric structure and all serve a different purpose, which makes them unique. For example, the non metallic sheathed wires type NM is used very commonly in residential buildings as well as in Armored cable wires for commercial centers. There are also specialty Wires like low voltage and high voltage cables and they all serve their own purposes in particular environments and load specifications. Knowing and understanding these types allows you to select the right wires for safety and efficiency in your projects.