Here’s a question for you: What is the oldest profession in the world? Nah…not what you think: it is the cable guy! How else did God get the light to go on that very first day of creation?Now that I have your attention and all joking aside… a factor that is commonly overlooked in choosing wiring is the material that the wire is made from. Copper and aluminum are the most commonly used wire materials and there is an important difference in quality, power handling and signal transfer between these materials.