In the United States, the standard utility poles stands at about forty feet above ground and are usually buried at least six feet under the surface of the ground. However, in urban areas, it is often necessary to construct utility poles that are over one hundred feet making sure they comply with clearance codes. How far apart they are placed depends mainly on the terrain and the locations they are to be found. A pole is typically made out of wood that has been treated with a preservative to prevent it from rotting or being attacked by natural decay elements. The preservatives are hardly ever good enough to maintain the poles for an eternity, but only for fifty years or so. There are several tree species that are used to make a pole, although the southern yellow pine is the most commonly used tree. Other poles are made using steel and fiberglass. The most common use of a pole is carrying wires and equipment used to distribute electricity across significant distances. On top of a pole is a special set of apparatus that ensure the wires remain at a safe distance from each other and from other power and communication lines. They often have an arm built across them horizontally at the top. In most countries, certainly in the United States, a pole may also act as a carrier of communication lines. The lines are placed below the power lines to ensure they do not touch or affect each other in any way. They are also spaced in a manner that prevents workers working on the communication lines not to be affected by the electricity lines. A utility pole may be used to carry some other equipment. They are commonly used to hose street lights and traffic lights. Some even accommodate cell phone network lines. In other parts of the country, they may be used to carry decorations during holidays like Christmas and Halloween. These poles are very important for the functioning of society. They are an integral part of modern existence today. If you're unhappy with the consistency of wood poles, but can't justify the cost of steel or concrete, McWane ductile iron utility poles are the perfect solution. Our durable, eco-friendly poles are a groundbreaking alternative to conventional distribution poles.(http://www.mcwanepoles.com)
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