021_E-6_0005.pdf

This is a technical drawing/blueprint for electrical distribution system manhole and intercept box details, prepared by the Department of the Interior Bureau of Indian Affairs Division of Plant Design and Construction for the Sherman School Facilities in Riverside, California.

The drawing, designated as E-6 sheet 21 of 22, provides comprehensive specifications for telephone manhole and intercept box components. The document includes multiple cross-sectional views (Section A-A and Section B-B), plan views of the manhole structure, and detailed exploded views showing the telephone manhole "PB," telephone intercept box, manhole ring, cone, and cover assemblies. The drawing contains specific dimensional notations, material specifications, and construction details for underground utility infrastructure. A general notes section outlines installation requirements, including specifications for casting materials, structural reinforcement, and proper setting procedures for manhole covers. The technical specifications address the physical construction and assembly of these utility access structures for electrical and telecommunications distribution systems serving the school facility.