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Electrical Wiring of Buildings
Before we go into the basics of electrical wiring, we must first understand the basic principles of electric current. The resistance of an electrical current increases as the length of the wire is increased and is inversely proportional to the area of the bridge. Insulators and conductors both have high and low resistance, respectively. The breakdown voltage, also known as dielectric strength, is determined by the thickness of insulating materials. High enough voltage is sufficient to free electrons from insulating materials.
XLP wire is commonly referred to as RHH/RHW building wire. This designation indicates that the cable meets the requirements of UL standard 854 and is suitable for use in underground service. The letters "RHH" and "RHW" stand for the resistance of the cable to different chemicals and pressure. XLP wire can be used in dry, wet, and overhead applications, and the USE-2 version has a voltage rating of 600 volts.
NM cable is a popular choice for electrical wiring of buildings. This type of cable is made of 65 percent copper and covers individual conductors with color-coded PVC insulation. Most houses use 12 or 14-gauge wire with two or three conductors. NM cable is commonly used in commercial and residential buildings. It is available for both indoor and outdoor applications. Copper-coated cable is often used in residential wiring because it is more durable.
NM cable with PVC sheath
NM cable has PVC sheath and is available in different sizes. Its standard gauge is six to twelve AWG and the number of wires varies according to its size. Typically, NM cable is used for electrical wiring in buildings and has a rating of 600 volts, and is non-conductive and heat-resistant. It is often used in electrical wiring of residential buildings.