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Closed Door racking (CDR) units
Closed door racking units shall be provided to rack the disconnect stabs to and from the vertical bus while keeping the unit door closed.
CDR units shall meet/maintain the NEMA enclosure rating of the MCC they are installed within.
CDR units shall not increase the unit size.
Where CDR units are installed within an arc-resistant type MCC they shall meet/maintain the arc resistant rating of the MCC.