What is the Bus material for the distribution in ALL the Square D Combination Service Entrance Devices(CSED), meter mains or All-In-Ones and do any have copper bus?

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What is the bus material for the distribution in ALL the combination service entrance devices (CSEDs), meter mains, and all-in-ones?

Issue:
Product design features

Product Line:
Combination Service Entrance Devices

Resolution:
ALL the CSEDs that use a Homeline interior have tin-plated aluminum bus.
ALL the CSEDs that use a QO interior have tin-plated copper bus.

NOTES:
1)Even though a CSED has a QO interior, ONLY the bus portion where the branch breakers would plug onto would be copper. Any other bus parts internal to the device would be aluminum. There is no option for an entire copper bus CSED.