# The Ecodesign for Energy-Related Products and Energy Information Regulations 2021, Paragraph 5: Energy efficiency requirements for motors


The minimum efficiency of 60 Hz motors at a rated power not provided in Tables 24 to 26 must be determined as follows—
(a) the efficiency of a rated power at, or above, the midpoint between two consecutive values in the tables is the highest of the two efficiencies;
(b) the efficiency of a rated power below the midpoint between two consecutive values in the tables is the lowest of the two efficiencies.
Table 27
Interpolation coefficients for motors with rated power output P from 0.12 kW up to 0.55 kW
IE code
Coefficients
2 poles
4 poles
6 poles
8 poles
IE2
A
22.4864
17.2751
-15.9218
6.4855
B
27.7603
23.978
-30.258
9.4748
C
37.8091
35.5822
16.6861
36.852
D
82.458
84.9935
79.1838
70.762
IE3
A
6.8532
7.6356
-17.361
-0.5896
B
6.2006
4.8236
-44.538
-25.526
C
25.1317
21.0903
-3,0554
4.2884
D
84.0392
86.0998
79.1318
75.831
IE4
A
-8.8538
8.432
-13.0355
-4.9735
B
-20.3352
2.6888
-36.9497
-21.453
C
8.9002
14.6236
-4.3621
2.6653
D
85.0641
87.6153
82.0009
79.055
Table 28
Interpolation coefficients for motors with rated power output P from 0.75 kW up to 200 kW
IE code
Coefficients
2 poles
4 poles
6 poles
8 poles
IE2
A
0.2972
0.0278
0.0148
2.1311
B
-3.3454
-1.9247
-2.4978
-12.029
C
13.0651
10.4395
13.247
26.719
D
79.077
80.9761
77.5603
69.735
IE3
A
0.3569
0.0773
0.1252
0.7189
B
-3.3076
-1.8951
-2.613
-5.1678
C
11.6108
9.2984
11.9963
15.705
D
82.2503
83.7025
80.4769
77.074
IE4
A
0.34
0.2412
0.3598
0.6556
B
-3.0479
-2.3608
-3.2107
-4.7229
C
10.293
8.446
10.7933
13.977
D
84.8208
86,8321
84.107
80.247

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Source: https://www.legislation.gov.uk/ukdsi/2021/9780348222920/schedule/16/paragraph/5 (the official version)
Page: https://openlegislation.uk/draft-ecodesign-for-energy-related-products-and-energy-information-regulations-2021/schedule-16/paragraph-5
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.