
Report No: 094061R-ITCEP07V06
Page: 71 of 123
(b) 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 that is the limit of Class A multiplied by a factor of 1.5.
(c) Limits of Class C Harmonics Currents
Harmonics Order
n
Maximum Permissible harmonic current
Expressed as a percentage of the input
current at the fundamental frequency
%
2 2
3
30.λ
*
5 10
7 7
9 5
11 n 39
(odd harmonics only)
3
*λ is the circuit power factor
(d) Limits of Class D Harmonics Currents
Harmonics Order
n
Maximum Permissible
harmonic current per watt
mA/W
Maximum Permissible
harmonic current
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
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