Electrical Detail Drawing.pdf

This is an electrical service wiring and assembly detail drawing from the Montana Department of Transportation for an Overhead Service and Underground Service Assembly, specifically related to AWG No. 8 to RWIS (Roadway Information Systems). The technical schematic provides front and side view diagrams detailing electrical service installation components, including main disconnect switches, circuit breakers, lightning arrestors, service-rated mains, conduit specifications, and grounding requirements for what appears to be a roadside infrastructure electrical system.

The drawing includes precise technical specifications for electrical infrastructure, including 120/240 volt underground service, 3" rigid steel conduit details, NEMA Type 3R cabinet configurations, and specific mounting and spacing requirements for meter bases and associated electrical equipment. While the accompanying contract description mentions the Missoula District and suggests a Roadway Information Systems installation, the drawing itself provides the technical engineering blueprint for the electrical service components necessary for the project's implementation, focusing on standardized electrical installation practices for transportation infrastructure.