Trying to understand the 25 foot rule.

[Bugman1400]

NEC seems to show examples using AC, does the rule apply to DC as well. Would the rule apply to multiple taps off the same smaller wire? For example, if a 60A MCCB is protecting #6 (75deg) wire, can you tap off with #10 (75deg) conductor and wire to the non-protected side of six fuse-blocks? The load side of the fuse-blocks will be below 30A.

 

[Bugman1400]

 

[JoeStillman]

If the power block and the fuse block are in the enclosure in the picture and the #10's are less than 25', then you're installation is ok.

The #10 tap conductors upstream of the 30A fuses are not protected from overload by the 60A breaker, but are protected from short-circuit. Their overload protection is the 30A fuse. Since there is no other tap between the power block and fuse block, all the load on that wire is seen by the fuse. An overload in the tap conductor is impossible, only a short and you have the 60A CB for that.