[Dennis Alwon]

* Basically, if the bundled single conductors in the above loadcenter, are more than 3 current-carrying conductors & bundled longer than 24" the adjustment factors per table, will apply.

I disagree. Look at note 1 to the table. This table is for conductors in a raceway or cable, not in an enclosure

1Number of conductors is the total number of conductors in the
raceway or cable, including spare conductors. The count shall be
adjusted in accordance with 310.15(B)(5) and (6). The count shall not
include conductors that are connected to electrical components that
cannot be simultaneously energized.

 

[Dennis Alwon]

Good morning from West Coast Dennis.
(yawn) me just now rising.. True, it's not installed in raceway or cable assembly. But the way I'm interpreting is clear description, mid-way, first sentence denoting "single conductor" not installed in raceways.

310.15(C)(1) N
-or where single conductors or multiconductor cables not installed in raceways are installed without maintaining spacing for a continuous length longer than 600mm (24 in.).


Informational Note No.1 See Annex B for adjustment factors for more than three current carrying conductors in a raceway or cable with load diversity.

Informational Note No. 2.
366.23(A) Sheet Metal Auxiliary Gutters: The Adjustment factor 310.15(E) exceeds 30 @ cross-sectional area-
376.(22)(B)Metal Wireways The adjustment factors 310.15(C)(1) shall be applied where number exceeds 30 @ cross-sectional ar area -

* neither note is applying...
as stated in the above (single conductors) not install in raceway are installed without maintaining spacing- longer than 24 inches.

I hear you but IMO, that is talking about single conductors in a cable tray but I may be wrong. I have never seen anyone derate in a panelboard probably because there is so much space for the conductors to breathe.

 

[Dennis Alwon]

My personal opinion, No.. I wouldn't consider that "bundling" if breaking the 'ties' & forming the wires as you are suggesting. But my name doesn't appear anywhere, in front of that book either.
The NFPA70 is denoting in length @ 24 inches.
*There's not violation @ 23.5 inches....

You see that doesn't make sense. The tie wrap only gathers the wire in a bundle in one spot not the 24" required to qualify for de-rating. I see the group as bundling regardless of the tie wrap. I didn't realize the tie wrap was the issue.