Motor Minimum Efficiency (DOE)

The nominal full-load efficiency that general-purpose motors sold in the US must meet, by horsepower, pole count and enclosure.

From June 1, 2016 — Table 5 percent — enclosed = TEFC, open = ODP

hp	kW	2-pole enclosed	2-pole open	4-pole enclosed	4-pole open	6-pole enclosed	6-pole open	8-pole enclosed	8-pole open
1	0.75	77.0	77.0	85.5	85.5	82.5	82.5	75.5	75.5
1.5	1.1	84.0	84.0	86.5	86.5	87.5	86.5	78.5	77.0
2	1.5	85.5	85.5	86.5	86.5	88.5	87.5	84.0	86.5
3	2.2	86.5	85.5	89.5	89.5	89.5	88.5	85.5	87.5
5	3.7	88.5	86.5	89.5	89.5	89.5	89.5	86.5	88.5
7.5	5.5	89.5	88.5	91.7	91.0	91.0	90.2	86.5	89.5
10	7.5	90.2	89.5	91.7	91.7	91.0	91.7	89.5	90.2
15	11	91.0	90.2	92.4	93.0	91.7	91.7	89.5	90.2
20	15	91.0	91.0	93.0	93.0	91.7	92.4	90.2	91.0
25	18.5	91.7	91.7	93.6	93.6	93.0	93.0	90.2	91.0
30	22	91.7	91.7	93.6	94.1	93.0	93.6	91.7	91.7
40	30	92.4	92.4	94.1	94.1	94.1	94.1	91.7	91.7
50	37	93.0	93.0	94.5	94.5	94.1	94.1	92.4	92.4
60	45	93.6	93.6	95.0	95.0	94.5	94.5	92.4	93.0
75	55	93.6	93.6	95.4	95.0	94.5	94.5	93.6	94.1
100	75	94.1	93.6	95.4	95.4	95.0	95.0	93.6	94.1
125	90	95.0	94.1	95.4	95.4	95.0	95.0	94.1	94.1
150	110	95.0	94.1	95.8	95.8	95.8	95.4	94.1	94.1
200	150	95.4	95.0	96.2	95.8	95.8	95.4	94.5	94.1
250	186	95.8	95.0	96.2	95.8	95.8	95.8	95.0	95.0
300	224	95.8	95.4	96.2	95.8	95.8	95.8	—	—
350	261	95.8	95.4	96.2	95.8	95.8	95.8	—	—
400	298	95.8	95.8	96.2	95.8	—	—	—	—
450	336	95.8	96.2	96.2	96.2	—	—	—	—
500	373	95.8	96.2	96.2	96.2	—	—	—	—

From June 1, 2027 — Table 8 percent — bold = higher than 2016; excludes fire pump and air-over motors

hp	kW	2-pole enclosed	2-pole open	4-pole enclosed	4-pole open	6-pole enclosed	6-pole open	8-pole enclosed	8-pole open
1	0.75	77.0	77.0	85.5	85.5	82.5	82.5	75.5	75.5
1.5	1.1	84.0	84.0	86.5	86.5	87.5	86.5	78.5	77.0
2	1.5	85.5	85.5	86.5	86.5	88.5	87.5	84.0	86.5
3	2.2	86.5	85.5	89.5	89.5	89.5	88.5	85.5	87.5
5	3.7	88.5	86.5	89.5	89.5	89.5	89.5	86.5	88.5
7.5	5.5	89.5	88.5	91.7	91.0	91.0	90.2	86.5	89.5
10	7.5	90.2	89.5	91.7	91.7	91.0	91.7	89.5	90.2
15	11	91.0	90.2	92.4	93.0	91.7	91.7	89.5	90.2
20	15	91.0	91.0	93.0	93.0	91.7	92.4	90.2	91.0
25	18.5	91.7	91.7	93.6	93.6	93.0	93.0	90.2	91.0
30	22	91.7	91.7	93.6	94.1	93.0	93.6	91.7	91.7
40	30	92.4	92.4	94.1	94.1	94.1	94.1	91.7	91.7
50	37	93.0	93.0	94.5	94.5	94.1	94.1	92.4	92.4
60	45	93.6	93.6	95.0	95.0	94.5	94.5	92.4	93.0
75	55	93.6	93.6	95.4	95.0	94.5	94.5	93.6	94.1
100	75	95.0	94.5	96.2	96.2	95.8	95.8	94.5	95.0
125	90	95.4	94.5	96.2	96.2	95.8	95.8	95.0	95.0
150	110	95.4	94.5	96.2	96.2	96.2	95.8	95.0	95.0
200	150	95.8	95.4	96.5	96.2	96.2	95.8	95.4	95.0
250	186	96.2	95.4	96.5	96.2	96.2	96.2	95.4	95.4
300	224	95.8	95.4	96.2	95.8	95.8	95.8	—	—
350	261	95.8	95.4	96.2	95.8	95.8	95.8	—	—
400	298	95.8	95.8	96.2	95.8	—	—	—	—
450	336	95.8	96.2	96.2	96.2	—	—	—	—
500	373	95.8	96.2	96.2	96.2	—	—	—	—
550	410	95.8	96.2	96.2	96.2	—	—	—	—
600	447	95.8	96.2	96.2	96.2	—	—	—	—
650	485	95.8	96.2	96.2	96.2	—	—	—	—
700	522	95.8	96.2	96.2	96.2	—	—	—	—
750	559	95.8	96.2	96.2	96.2	—	—	—	—

Sources: 10 CFR 431.25(h), Table 5 — NEMA Design A and B and IEC Design N general-purpose motors, compliance from June 1, 2016; 10 CFR 431.25(n), Table 8 — NEMA Design A and B and IEC Design N motors (excluding fire pump and air-over motors), compliance from June 1, 2027. © RokBench.