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A customer requires THDi from the UPS not to exceed 3% and wants high efficiency.

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A customer requires THDi from the UPS not to exceed 3% and wants high efficiency. The UPS has a 6-pulse SCR/thyristor rectifier and is loaded ~80%. Many ICT changes are expected in the next 3 years. What should you recommend?

A.

Nothing; the UPS will keep THDi at the right levels

B.

Install a passive harmonic filter on the UPS

C.

Install an active harmonic filter on the UPS

D.

Install an isolation transformer rated K13 or K20

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