UTP cables are the most commonly used networking cables on the market and are considered to be the fastest copper-based medium available. They are less expensive than STP cables, costing less per meter than other types of LAN cabling. This makes them not only more affordable but more easily dispensable. They have an external diameter of approximately .43 cm, making it a smaller cable than STP cable and easier to work with during installation, as it doesn’t fill the wiring ducts as fast as other cables. It comes in various categories, from Level 1 for in-home telephone wiring to Level 6 for Ethernet networking. It is the most compatible cabling and can be used with most other major networking systems and does not require grounding.