Hospital meets critical power needs

Phoenix Children's Hospital's emergency power supply system must meet emergency standby requirements for both a healthcare facility and a high-rise building.


Phoenix Children’s Hospital in Phoenix is both a healthcare facility and a high-rise building. As such, the facility’s emergency power supply system (EPSS) must meet emergency standby requirements for both types of facilities. To meet these requirements the facility has a remote central energy plant housing most of its EPSS. The emergency power supply (EPS) consists of three 2 MW generators and medium-voltage paralleling gear and distribution. Unit substations are located throughout the facility with automatic transfer switches (ATS) located downstream of unit substation. Any of the three 2 MW generators can accommodate the requirements of NFPA 70 and NFPA 99 for the life safety branch and critical branch for the entire facility. There are also a variety of stored emergency power supply systems (SEPPSS).

With more than 1 million sq ft of space, the campus expansion will make Phoenix Children’s Hospital one of the largest freestanding children’s hospitals in the country. Courtesy: ccrd partners

The EPSS serves all of the required fire protection and life safety systems including voice communications, fire detection and alarm system, electric fire pump, emergency fire command center, exit signs, means of egress illumination, power operated doors, and mechanical stair shaft ventilation systems for smoke-proof enclosures. The EPSS also serves all other functions required under NFPA 70 Article 517.

There are a variety of SEPSS battery systems used throughout the facility. There is a central inverter to provided egress lighting in the main lobby, emergency battery ballast used in rooms where patients are anesthetized, and a centralized UPS for the data center.

This shows the paralleling gear in Phoenix Children’s Hospital emergency switchgear room. Courtesy: ccrd partners

Multiple system tests were performed to ensure that each of the required systems would operate correctly when different events occurred. A variety of different test were conducted including power outages, remote power transfer on ATS from the command center, smoke detector activation, pull station activation, duct detectors activation, and fire pump test to ensure the proper system function.

Grimm is associate principal and project manager with ccrd partners in the Phoenix office. He is the lead electrical engineer, and leads the electrical design of different projects including hospitals, institutional facilities, and office buildings.

No comments
The Engineers' Choice Awards highlight some of the best new control, instrumentation and automation products as chosen by...
The System Integrator Giants program lists the top 100 system integrators among companies listed in CFE Media's Global System Integrator Database.
The Engineering Leaders Under 40 program identifies and gives recognition to young engineers who...
Learn how to increase device reliability in harsh environments and decrease unplanned system downtime.
This eGuide contains a series of articles and videos that considers theoretical and practical; immediate needs and a look into the future.
Learn how to create value with re-use; gain productivity with lean automation and connectivity, and optimize panel design and construction.
Machine design tips: Pneumatic or electric; Software upgrades; Ethernet advantages; Additive manufacturing; Engineering Leaders; Product exclusives: PLC, HMI, IO
Industrial wireless cyber security: More complex than black and white; IIoT at the I/O level; Process modeling; Cyber security research
Robotic advances: Software, form factors; System-based ROI; Embedded control; MES and information integration; SCADA and cyber security; Position sensor; Controller, I/O module
Learn how Industry 4.0 adds supply chain efficiency, optimizes pricing, improves quality, and more.

Find and connect with the most suitable service provider for your unique application. Start searching the Global System Integrator Database Now!

Drilling for Big Data: Managing the flow of information; Big data drilldown series: Challenge and opportunity; OT to IT: Creating a circle of improvement; Industry loses best workers, again
Pipeline vulnerabilities? Securing hydrocarbon transit; Predictive analytics hit the mainstream; Dirty pipelines decrease flow, production—pig your line; Ensuring pipeline physical and cyber security
Cyber security attack: The threat is real; Hacking O&G control systems: Understanding the cyber risk; The active cyber defense cycle