B08_Attach_02_North_Rim_Final_CDs_Volume_05_20261012_Part13.pdf

This is an Electrical Site Plan drawing for the North Rim of Grand Canyon National Park. The document is a technical schematic prepared by HDR Engineering, Inc., with the prime contractor located in Denver, CO 80202, dated June 2026.

The plan illustrates electrical infrastructure improvements at the North Rim facility, including the installation of three-phase medium voltage underground power cables from existing rooming springs to new distribution points, replacement of a 500kVA transformer with a 277V transformer (T-67), installation of secondary power distribution systems with new cable and conduit routing, installation of 150V (1/2) I/O and aluminum armored power cables, installation of 150V (1/2) AIC URD cable with concentric neutral, routing of power to RS Cave in the mini power zone, installation of armored 24-strand singlemode fiber cable in 2-inch conduit underground, and installation of 144-strand SM fiber in 2-inch conduit underground. The drawing includes detailed key notes numbered 1 through 10 specifying technical requirements for cable installations, transformer specifications, grounding procedures, and conduit details. The plan references Volume 10 for continuation of overhead power and fiber routing and includes boreholes A and B exit locations. The drawing is Sheet 051 (E101) with Drawing Number 182752.