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Why do neutral conductors need to be oversized?

April 26, 2017conductors Neutral oversized

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Why do neutral conductors need to be oversized?

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Single phase nonlinear loads carry a high amount of 3rd harmonic. The 3rd harmonic is in phase in all three phases so they add into the neutral. This can result in neutral current with a higher value than the phase current. The large conductor is designed to carry the additional expected current.