Requirement for free cable
I'm not sure of a specific requirement, I imagine there is one, I always like to leave about 6 inches or so, but not too much as to make the box too crowded. I also like to leave some slack outside the box (before I split it, of course) so that in the event the box needs to be moved, or a wire is accidentally cut inside the box, there is some slack that can be used. Though I only really do this in places where I have access behind the box such as if it's a junction box in the basement.
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