Raceway Chapter 9, Table 4
Nipple ≤ 24 in. — 60% fill permitted (Ch. 9 Note 4)
Conductors Chapter 9, Table 5 — include the EGC (Note 3)
Equipment grounding and bonding conductors count toward fill (Ch. 9, Note 3). THHN/THWN/THWN-2 share one column; XHHW insulation is thicker — pick the type printed on the jacket.