When more than one cable is to be laid in the same trench, a horizontal or vertical inter-axial spacing of at least 30 cm is provided in order to reduce the effect of mutual heating and also to ensure that a fault occurring on one cable does not damage the adjacent cable. The Fiber Optic Association, Inc. (FOA) was founded in 1995 to help develop the workforce to build the fiber optic networks to support a rapid expansion in communications and the Internet. The charter of the FOA was to promote professionalism in fiber optics through education, certification, and. Laying Underground Cables can be done by the 3 methods namely: Direct Laying Draw in system Solid system This method of laying underground cables is simple and cheap and is much favored in modern practice. In this method, a trench of about 1·5 meters deep and 45 cm wide is dug. In extreme cold climates, cables may need to be buried at greater depths where there temperatures are colder and frost penetrates to.
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