Why only one neutral contactor kept on line during synchronizing condition of two or more gen sets?

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Distributed generator systems (gensets) are electric generating facilities that are close to the electric user's home or business.

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What is neutral contactor?  Phase synchronizing device?  Why only one neutral contactor kept online during synchronising?  Why only one neutral contactor kept on line during synchronizing condition of two or more gen sets Distributed generator?  Why only one neutral contactor kept online during synchronising while two or three dg?