Energy meters shine light on power consumption

When MEP engineering firm Glumac set up a new office space on the ground floor of an existing high-rise in Irvine, CA, the company had an ambitious goal even before the move-in — to certify the new 8,762-sq-ft space Platinum under LEED for Commercial Interiors (CI).

Glumac electrical engineer Jennifer Berg, P.E., worked with Glumac’s lighting design studio to implement a lighting system that would make effective use of the wide-open fl oor plan and large concrete columns rising 21 ft to the top of an urban loft-like structure. The task lighting system is integrated with the furnishings to provide 50-ft-candle illumination at the work surface.

Berg placed a priority on achieving signifi cant savings over the California State Energy Code’s Title 24 allowance for lighting energy. With this emphasis on actual performance, she knew that Glumac would need to monitor the system’s power usage at different locations and in real time.

Berg was familiar with E-Mon from other projects and decided that using the meters at Glumac would be a good opportunity to see fi rsthand just how their data acquisition capabilities would pan out for Glumac’s unique needs. She contacted E-Mon’s local factory rep, Corey Bishop of Blanchard Associates, who coordinated the installation of three Class 3000 advanced kWh/kW meters.
Designed to install in new or retrofi t applications, E-Mon D-Mon revenue-grade meters gather energy consumption and demand data for tenant billing, cost allocation, load analysis and control, equipment diagnostics, and other useful functions of value to the facility’s energy savings and cost-cutting initiatives.

All three meters installed at Glumac were confi gured as 120/208- 240V three-phase wye; two were rated for 200A and the third at 100A. The meters track consumption patterns for up to 24 circuits.

Based on the electrical drawings provided by Berg, Bishop asked for a few alterations in the way the electrical panels were populated with circuit breakers in order to more effi ciently consolidate the loads that Glumac wanted to monitor. This also enabled the most effective implementation of the metering system design. During the installation phase, the E-Mon meter’s built-in self-diagnostic capability identifi ed a reverse-installed current transformer (CT) that was easily corrected.

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