410.64 Luminaires as Raceways. Luminaires shall not be
used as a raceway for circuit conductors unless they com-
ply with 410.64(A), (B), or (C).
(A) Listed. Luminaires listed and marked for use as a race-
way shall be permitted to be used as a raceway.
(B) Through-Wiring. Luminaires identified for through-
wiring, as permitted by 410.21, shall be permitted to be
used as a raceway.
(C) Luminaires Connected Together. Luminaires de-
signed for end-to-end connection to form a continuous as-
sembly, or luminaires connected together by recognized
wiring methods, shall be permitted to contain the conduc-
tors of a 2-wire branch circuit, or one multiwire branch
circuit, supplying the connected luminaires and shall not be
required to be listed as a raceway. One additional 2-wire
branch circuit separately supplying one or more of the con-
nected luminaires shall also be permitted