Data center is solidly grounded
Syska Hennessy Group designed a data center that required solidly grounded underground duct banks.
Recently, Syska Hennessy Group led the design of a large data center that required a 25 kV utility service, solidly grounded, in underground duct banks. The service was 25 kV, 100% insulation level, copper conductors with ethylene propylene rubber (EPR) insulation.
The facility has an on-site 25 kV/13.2 kV substation to supply a 13.2 kV distribution system in underground duct banks. The system is impedance grounded and can be operated with one phase grounded for an unlimited time. When design engineers couldn’t find a cataloged 15 kV class cable with 173% insulation level, Syska used a 25 kV-class cable with 100% insulation level, copper conductors, and EPR insulation. The data center’s electrical infrastructure 600 V class facility distribution system was designed solidly grounded in overhead conduits and includes the following:
- 600 V class copper conductors with thermoplastic high heat nylon (THHN) insulation
- 600 V class facility distribution system, solidly grounded, in underground duct banks
- 600 V class copper conductors with rubber high heat waterproof (RHHW-2) insulation
- 600 V class plug-in bus ducts with copper conductors for distribution to IT equipment cabinets
- 600 V class feeder bus duct with copper conductors for maintenance bypass and load bank circuits that are only occasionally used
- 600 V class cable bus with copper conductors for large capacity feeders in the critical distribution system.
Christopher M. Johnston is a senior vice president and the chief engineer for Syska Hennessy Group's critical facilities team. Johnston specializes in the planning, design, construction, testing, and commissioning of mission critical 7x24 facilities, and leads team research and development efforts to address current and impending technical issues in critical and hypercritical facilities. With more than 40 years of engineering experience, he has served as quality assurance officer and supervising engineer on many projects.
- Events & Awards
- Magazine Archives
- Oil & Gas Engineering
- Salary Survey
- Digital Reports
Annual Salary Survey
Before the calendar turned, 2016 already had the makings of a pivotal year for manufacturing, and for the world.
There were the big events for the year, including the United States as Partner Country at Hannover Messe in April and the 2016 International Manufacturing Technology Show in Chicago in September. There's also the matter of the U.S. presidential elections in November, which promise to shape policy in manufacturing for years to come.
But the year started with global economic turmoil, as a slowdown in Chinese manufacturing triggered a worldwide stock hiccup that sent values plummeting. The continued plunge in world oil prices has resulted in a slowdown in exploration and, by extension, the manufacture of exploration equipment.
Read more: 2015 Salary Survey