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Senior Member
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Why wouldn't they be? Just get a fusible disconnect otherwise,

6-204 Fuse enclosure on service boxes
If a service box embodies one or more fuseholders, access to which may be had without opening the door, such fuseholders and their fuses shall be completely enclosed by a separate door, spring-closed, or with a substantial catch.
 

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Electrical Simpleton
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3,350 Posts
This would be in place of full rating/ series rating
You may find that the current limiting fuse will not protect MCCB's downstream.

Take a look at 240.86

Pete
 

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