Water Well Journal

May 2016

Water Well Journal

Issue link: http://read.dmtmag.com/i/668983

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Page 31 of 77

In other words, a motor's nameplated efficiency rating— known as the NEMA Nominal Rating—may not reflect its true efficiency in the pumping operation. Beginning in June, manufacturers will be required to stamp the NEMA Nominal Rating on their motors' nameplates, sig- nifying the motor operates at that efficiency under those stan- dard operating conditions. Because this rating does not necessarily reflect how a motor will perform in its intended application, motor manu- facturers will have to supply a second "full-load efficiency rating" that reflects the motor's actual efficiency given the actual site conditions. In most cases, this rating will be lower than the NEMA Nominal Rating (see Figure 1). Why it matters It is important for users to understand the difference be- tween a motor's NEMA Nominal Efficiency and its actual op- Figure 1. Know your motor's nameplate. While the NEMA Nominal Efficiency rating listed on this motor's nameplate is 95.8, its actual full-load efficiency is 95.3, due to efficiency losses caused by actual operating conditions. General purpose motors will continue to be regulated at NEMA Premium levels. DOE from page 27 waterwelljournal.com 28 May 2016 WWJ Is my motor covered by the new regs? The Department of Energy's new expanded electric motor stan- dards apply to any motor that has these nine characteristics: • Single-speed induction motors • Poly-phase, AC, 60 HZ • Squirrel-cage • Continuous duty (MG-1) or duty type S1 (IEC) • 2-, 4-, 6- or 8-pole configuration • Rated 600 volts or less • NEMA 56 frame size or IEC metric equivalent • Between 1 and 500 hp (or kW equivalent) • NEMA Design A, B or C or IEC design N or H

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