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Can a second 200 ampere main service disconnect be added to the QU12L400CL?

Addition of 2nd main disconnect

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Misunderstanding of the wiring diagram

Yes, it can. Additional space is provided for the field installation of a second QDL main service disconnect, 200A maximum. Further additional space is provided for the field installation of up to four QOH main service disconnects, 125A maximum. The total ampacity of the combination of QOH breakers cannot exceed 200A.
When field installing the second main disconnect, the installer will add their own appropriately sized wires from the double lugs as shown in the wiring diagram to the new breaker.
A cut sheet for the device is here.

More information on our Combination Service Entrance Devices here.
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