045-5 Wyo. Code R. § 5-13
(a) Additional facilities by the same utility may be attached to or located immediately adjacent to an existing licensed facility, provided the existing facility is in compliance with the provisions of this regulation and the additional facility can be installed likewise.
(b) At the discretion of the District such additional facilities may be authorized for construction upon submittal of an amended exhibit showing the location of the additional line.
(c) In case of an aerial facility that is being upgraded to a larger capacity, or in case of an underbuilt by the utility holding the existing license, the revised exhibit should show the increased capacity and revised low sag vertical clearance above the high point of the paved portion of the road, which shall be no less than eighteen (18) feet and/or otherwise in compliance with the National Electric Safety Code.
045-5 Wyo. Code R. § 5-13