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Before any overhead power line can be implemented a thorough investigation and study must be carried out to ensure that the most practical route is selected. The overhead line equipment plays a vital part in the selection of route, both pole mounted transformers and high voltage insulators are all determining factors.  Maps are developed in order to identify the avoidance and exclusion areas and other requirements before the project can begin. Once final route  selection has been agreed the utility poles have to be selected.