Electrical mains not grouped

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Hello,
I am designing two townhouses. Under what conditions do the electrical mains not have to be grouped? What is the NEC article?
Thank you

In addition to what GoldDigger said, there is also 230.40 exception #1 which allows different occupancies in the same building to have non grouped disconnects. The nec does not define "occupancy" so this can be a little sticky. Here in upstate ny, I can put a service disconnect in each apartment of a building.
 

don_resqcapt19

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retired electrician
Each set of service entrance conductors can have their own disconnect(s) and are not required to be grouped with the service disconnect(s) for other sets of service entrance conductors.
 
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