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What is the impact of Non Linear load on RMS current?

The presence of harmonic current will increase the total RMS current
supplied to the load . For example : If the fundamental current of particular
load is 100A, and the harmonic current is 30A in magnitude, then the total
RMS current of this load will be about 4% higher than the fundamental
Higher RMS current due to harmonic will have impact on the total capacity
of the feeder. This may call for over sizing of feeder, transformer, circuit
breaker, power source etc, impacting Capital investment.
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