Typical common efficiencies of electric motor ODP and TEFC

Typical common efficiencies of electric motor ODP and TEFC
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NEMA Design B Electrical Motors Efficiency

Electrical motors constructed according NEMA Design B must meet the efficiencies below.

Power
(hp)
Minimum Nominal Efficiency1)
1 – 478.8
5 – 984.0
10 – 1985.5
20 – 4988.5
50 – 9990.2
100 – 12491.7
> 12592.4

1) NEMA Design B, Single Speed 1200, 1800, 3600 RPM. Open Drip Proof (ODP) or Totally Enclosed Fan Cooled (TEFC) motors 1 hp and larger that operate more than 500 hours per year.

Efficiencies for 900 rpm, Standard Efficiency Motors
Motor SizeLoad Level In Percent
ODPTEFC
100%75%50%25%100%75%50%25%
1087,287,686,378,386,887,686,877,3
1587,888,888,279,687,588,788,179,1
2088,289,288,081,889,289,989,282,6
2588,689,288,083,089,790,389,178,6
3089,990,790,284,589,690,586,584,1
4091,091,891,786,290,591,485,585,0
5090,891,991,187,190,291,090,284,9
7591,792,492,186,591,691,891,087,0
10092,292,291,885,892,492,592,083,6
12592,992,391,786,993,093,192,187,9
15093,393,192,689,593,093,492,5NA
20092,893,593,1NA93,794,193,4NA
25093,193,593,0NA91,794,894,5NA
30093,193,792,992,794,494,293,7NA
Efficiencies for 1200 rpm, Standard Efficiency Motors
Motor SizeLoad Level In Percent
ODPTEFC
100%75%50%25%100%75%50%25%
1087,386,985,778,587,187,786,480,3
1587,487,586,880,888,288,187,380,7
2088,589,288,884,189,189,789,482,8
2589,489,789,385,089,890,589,883,5
3089,290,189,887,690,191,390,784,6
4090,190,490,085,890,390,189,385,3
5090,791,290,986,991,692,091,586,7
7592,092,592,388,691,991,691,087,2
10092,392,792,287,492,892,791,986,5
12592,692,992,887,993,093,092,688,7
15093,193,392,989,793,393,893,491,1
20094,194,693,591,594,094,393,6NA
25093,594,494,091,994,694,594,0NA
30093,894,494,392,994,794,894,0NA
Efficiencies for 1800 rpm, Standard Efficiency Motors
Motor SizeLoad Level In Percent
ODPTEFC
100%75%50%25%100%75%50%25%
1086,386,885,980,087,088,487,780,0
1588,089,088,582,688,289,388,480,7
2088,689,288,983,389,690,890,083,4
2589,590,690,086,690,090,990,383,4
3089,791,090,987,390,691,691,085,6
4090,190,089,086,390,790,589,284,2
5090,490,890,388,191,691,891,186,3
7591,792,492,087,792,292,591,387,1
10092,292,892,389,292,392,191,485,5
12592,893,292,790,792,692,391,384,0
15093,393,393,089,293,393,192,286,7
20093,493,893,390,794,294,093,187,8
25093,994,494,092,693,894,293,589,4
30094,094,594,293,494,594,493,389,9
Efficiencies for 3600 rpm, Standard Efficiency Motors
Motor SizeLoad Level In Percent
ODPTEFC
100%75%50%25%100%75%50%25%
1086,387,786,479,286,187,285,777,8
1587,988,087,382,886,887,885,979,5
2089,189,588,785,287,889,688,379,7
2589,089,989,184,488,689,687,979,3
3089,289,388,384,889,290,088,781,0
4090,090,489,986,989,088,486,879,7
5090,190,388,785,889,389,287,382,0
7590,791,090,185,791,290,588,782,5
10091,992,191,589,091,290,489,383,8
12591,691,891,188,891,790,889,282,6
15092,092,392,089,292,391,790,185,6
20093,093,092,187,992,892,290,584,9
25092,793,192,487,192,792,591,290,3
30093,994,393,890,493,292,891,189,9

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