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King County

King County is located in the U.S. state of Washington. The population was 2,269,675 in the 2020 census, making it the most populous county in Washington, and the 13th-most populous in the United States. The county seat is Seattle, also the state's most populous city. King County is one of three Washington counties that are included in the Seattle–Tacoma–Bellevue metropolitan statistical area. (The others are Snohomish County to the north, and Pierce County to the south.) About two-thirds of King County's population lives in Seattle's suburbs.


Services Delivered

Capabilities Deployed

Administration Building Electrical Upgrade

Low Voltage Systems Upgrade
24/7/365 Uptime Requirements
Large Complex Distribution Infrastructure
Multiple Stakeholders
Low Voltage System Inspection and Analysis

Project Description

The King County Administration Building, constructed in 1971, houses critical administrative, law enforcement, and emergency services for the county across 12 floors. The building's electrical system comprises original equipment from 1971.

Before engaging Casne Engineering, an energized TEGG test report and an arc flash risk assessment were conducted. Casne reviewed these reports and created an assessment report of the existing electrical system. In collaboration with an electrical contractor, Casne then prioritized panel inspections and oversaw field investigations to evaluate the electrical distribution system's baseline condition.

Upon completing the field investigation, Casne devised a replacement sequence for the electrical distribution system and provided a Rough Order of Magnitude (ROM) cost estimate for each equipment replacement. Due to budget constraints, the replacement process was designed to span over multiple years in a phased approach.

Casne developed design documents to address the over-dutied main switchgear lineup at the service entrance and to replace low-voltage transformers on various floors that were failing. This comprehensive approach helps ensure the King County Administration Building's electrical system functions efficiently and safely in the years to come.