Specifications

4.3. Harmonics Current Measurement
4.3.1. Limit
Limits of Class A Harmonics Currents
Harmonics Order
Maximum Permissible
harmonic current
Harmonics Order
Maximum Permissible
harmonic
current
n (A) n (A)
Odd harmonics Even harmonics
3 2.30 2 1.08
5 1.14 4 0.43
7 0.77 6 0.30
9 0.40 8 ≤ n ≤ 40 0.23 * 8/n
11 0.33
13 0.21
15 ≤ n ≤ 39 0.15 * 15/n
Limits of Class B Harmonics Currents
For Class B equipment, the harmonic of the input current shall not exceed the maximum permissible
values given in table which is the limit of Class A multiplied by a factor of 1.5.
Limits of Class C Harmonics Currents
Harmonics Order
Maximum Permissible harmonic current
Expressed as a percentage of the input current at the fundamental frequency
n (%)
2 2
3 30．λ
＊
5 10
7 7
9 5
11 ≤ n ≤ 39
(odd harmonics only)
3
＊λ is the circuit power factor
Limits of Class D Harmonics Currents
Harmonics Order
Maximum Permissible harmonic
current per watt
Maximum Permissible
harmonic current
n (mA/W) (A)
3 3.4 2.30
5 1.9 1.14
7 1.0 0.77
9 0.5 0.40
11 0.35 0.33
11 ≤ n ≤ 39
(odd harmonics only)
3.85/n See limit of Class A
A Test Lab Techno Corp.
Report Number: 1402CE13-01
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