1.1 ​Motor Nameplate 2 HP, 60 HZ, 1800 rpm, 4 pole, 3ph 400V, TEFC, DOL, NEMA nom. eff. 85.5, min. 82.5 Is this motor considered NEMA Premium Efficient?

1.2 Are IE3 and NEMA Premium efficiency levels equivalent to each other? ​

1.3 If 25HP 60Hz 8 POLE motor's calculated efficiency is 89%, this motor can be determined "Energy efficiency motor"?by the NEMA MG1 Table 12-11, 25HP 60Hz 8 POLE motor nominal efficiency is 89.5%, and minimum is 87.5%

1.4 Do you have any information regarding what type of motors are specifically not included in the NEMA Premium™ program? I’m mainly interested in explosion-proof motors, but would like a full list, if possible.

1.5 I am presently searching for a list of pre-1952 motor efficiencies from 1hp to 100hp. This will aid in assisting a customer garner the concept of savings when switching his old motors over to new premium efficient levels. Premium and EPAct levels are easy to find, however, any efficiency levels that were used prior to 1997 are obscure. Please assist in helping me find the industry standard efficiencies prior to 1997, and if possible, as far back as 1960/70. My customer has 40-year-old motors to replace. I thank you for your assistance.

1.6 I am in need of your assistance. I was wondering if the efficiency levels between NEMA and EPAct are the same for the following motor types (ODP), rpms, and Hp sizes listed below. They appear to have the same efficiency level for standard and high efficiency. Please apprise. ODP 1200 250 ODP 1200 300 ODP 1200 350 ODP 1200 400 ODP 1200 450 ODP 1200 500 ODP 3600 450 ODP 3600 500

1.7 I have been asked to find the correct documentation that legislates the efficiencies required for NEMA Premium™ standards and the deadlines to achieve this. I have been reading some of the documents available on the NEMA website indicating that integral gear motors do not need to meet these standards, however, we want to get ahead of the curve and place these types of motors on our gearboxes. Can you please help me locate this documentation?

1.8 The NEMA Premium™ Efficiency Tables list NEMA nominal efficiencies and minimum efficiencies for each motor type. It is my understanding that a motor nameplate that lists efficiency is generally the nominal efficiency. In short, the nameplate rating should conform to the NEMA tabulated nominal efficiency, not the tabulated minimum efficiency. Can you confirm this and advise as to the difference between the minimum and nominal tabulated efficiencies?

1.9 I would like to know what the differences are between “high efficiency” and “premium efficiency” motors, in terms of construction, pricing, efficiency, reliability, etc.

1.10 Table 12-12 is confusing. We have 125 Hp motors at 6-poles and 480 volts. Nameplate says "NEMA Nominal Eff. 94.1%". Table 12-12 indicates nominal of 95% and minimum of 94.1%. Is this considered premium efficiency motor or not? If not, why does Table 12-12, which is titled “Premium Efficiency Motors,” indicate a minimum efficiency of 94.1%? Would it be less confusing if the minimum efficiency figures were left off the table?

1.11 Will the following motors need to meet NEMA Premium™ efficiency levels after December 19, 2010 Explosion-Proof Motors, Vertical Hollow Shaft Motors, Oil Well Pump Motors (Design D)?

1.12 A customer that bought a motor from my company is claiming that they don't believe the motor is "high efficiency," as was specified before the purchase of the motor. What I would like to know is what standards does NEMA define for HVAC motor efficiencies? Is there a minimum efficiency? Are there levels like low, medium, high, and premium efficiency? I thought these questions might depend on the specific motor, so I've provided a pdf file with the motor and its specs. Any information you could provide would be very helpful.

1.13 Must inverter-duty motors be NEMA Premium™?

1.14 Can you please clarify for me what are the "7 types of low voltage polyphase, integral-horsepower induction motors not currently covered under federal law"?

1.15 Is there a way to estimate efficiency of polyphase motors 30-50Hp before the NEMA standard of 1977? Can I assume ac motors from 1965-1975 were already close to the NEMA table?

1.16 Does NEMA certify or recognize Explosion Proof Motors with NEMA Premium™ Efficiencies?

1.17 We are a manufacturer of industrial bulk material silo unloaders for the energy industry. We had a customer request Premium Efficiency motors that are to be used in a classified environment (Class 2, Division 2). We would typically use explosion proof motors in this classification; however, we did not find Premium Efficiency ratings for explosion proof motors. I do see them for TEFC and drip proof. Is there such a thing as Premium Efficiency Explosion proof motors? Maybe the need for explosion proof motors in Class 2, Division 2 environment should be revisited; TEFC may be sufficient.