Commercial wiring has different needs than residential, such as the load requirement and energy needs. The materials are also different as they require a higher voltage due to power demands within a commercial environment. Commercial wiring is made with a high heat resistant coating, also known as insulation to protect your wiring from liquids or gases that might corrode your wiring. There are national codes that a contractor has to abide by when working on commercial wiring. This is to make sure that the grounding is done properly in order to protect the employees of that building and the public from any type of electrical shock.