Abstract
When designing power transmission systems, electric utility companies are expected to follow a set of standard specifications that are briefly described in this research. The idea to be kept in mind is that during the planning and construction phases of transmission lines, natural elements, such as trees for example, there will be less of a chance of fault occurrences and therefore more power system reliability. Faults in transmission lines are one of the elements that will affect the reliability of the system. The more fault occurrences, the lesser the system reliability, since this causes outages in the power system that may result in the interruption of service. The electric utility companies are expected to provide the consumer a continuous and also a high quality of service at a competitive and reasonable cost. This means that they have to insure the reliability of the system to provide the consumer with a service that is consistent with the safety of personnel and equipment and meet their demands within not only the specifications of voltage and frequency but with a high degree of reliability and within reasonable cost to the consumer