ELECTRICAL

Overview
The existing buildings at the Williams Campus are provided with separate electrical services. The 12.47 kV overhead primary distribution system was originally owned and operated by Williams Air Force Base. When the facility was turned over, Salt River Project took responsibility for the system and has been upgrading it over the last few years to their standards.

As discussed with District personnel, CGCC has identified a power supply deficiency for the electrical distribution systems in the Mortuary Science (MSB), Fire Science (FSC), and General Science Buildings (GSB). These buildings should be considered for new electrical services as discussed below.

Basis for Estimated Electrical Loads
The estimated electrical loads are based on the recently completed Maricopa Community College projects including the Red Mountain Campus of Mesa Community College Project. The electrical loads for various building types are based on the following:

Building Type Total Load @ 480/277V Load @ 120/208V
Classroom/Administration 20 VA/GSF 10 VA/GSF
Classroom/Multipurpose 21 VA/GSF 11 VA/GSF

Existing Building Systems

• Building 470 (PEC), Gymnasium & Related Facilities (23,118 SF): As discussed in the Mechanical section, a new central plant will be built adjacent to Building 470 sized to supply buildings 470, 480, 481 and the proposed 6,000 square foot expansion between buildings 480 and 481. This work is not included in the Master Plan as it was addressed in a separate report. Associated electrical work will be covered under the scope of that project.
  
• Building 480 (FSC), Fire Sciences (10,024 SF): Building 480 has been identified as having insufficient capacity. Some spare capacity will become available when cooling is supplied from the new central plant, but the distribution equipment in the building is relatively old and should be considered for replacement.
  
• Building 481 (GSB), General Studies (8,353 SF): Building 481 has been identified as having insufficient capacity. Some spare capacity will become available when cooling is supplied from the new central plant, but the distribution equipment in the building is relatively old and should be considered for replacement.
  
• Building 477 (SLB), Science Lab (10,280 SF): This building was renovated within the last four years. Therefore, there is no work to be considered for building master planning.
  
• Building 426 (MSB), Mortuary Science (6,383 SF): The existing electrical service has been identified as having insufficient capacity. A new service should be provided.
  
• Building 410 (ATC), Aviation, Aerospace Technology (92,866 SF): A new electrical service and distribution system were provided for this building when the air-cooled chillers were installed in 1998. The electrical distribution system is adequately sized and no modifications are necessary.
  

12.47 kV Electrical Distribution System
Salt River Project (SRP) provides power to the Williams Complex. A network of overhead lines and utility poles provides 12.47 kV power throughout the complex. The new services for the Science Lab expansion and the new Classroom/Office Building will be supplied from this overhead system. SRP typically provides the conductors, manholes and 12.47 kV terminations. The District will provide the trenching and conduit from the nearest utility pole and equipment pads.

Fire Alarm Systems
Each of the buildings on the Williams Campus is provided with a stand-alone fire alarm system. These systems do not currently communicate through the Facility Management System, to a common security desk for monitoring on campus, as is the case with the other campuses. A communication link from the fire alarm panel in each building should be tied into the EMS system for that building and then they can each be monitored onsite (or off-site) by security. Currently the fire alarm systems are monitored off site by a contracted monitoring firm.

Scope of Work & Related Costs
Note: Cost estimates do not include professional services fees.

• Existing Buildings:
  

  Building 480 (FSC), Fire Sciences (10,024 SF) - Replacement of the existing service $ 30,000
  Building 481 (GSB), General Studies (8,353 SF) - Replacement of the existing service $ 30,000
  Building 426 (MSB), Mortuary Science (6,383 SF) - Replacement of the existing service $ 30,000

• New Buildings: As stated above, new buildings will be provided with new 277/480V service entrance sections supplied directly from the SRP 12.47 kV distribution system. Lighting and mechanical equipment will be supplied from the 480V distribution system and 120/208V loads will be supplied through a system of 480-120/208V transformers and panel boards.