336.10 (7) Between a cable tray and the utilization equipment or
device(s), provided all of the following apply:
a. The cable is Type TC-ER.
b. The cable is installed in industrial establishments
where the conditions of maintenance and supervision
ensure that only qualified persons service the
installation.
c. The cable is continuously supported and protected
against physical damage using mechanical protection
such as struts, angles, or channels.
d. The cable that complies with the crush and impact
requirements of Type MC cable and is identified with
the marking “TC–ER.”
e. The cable is secured at intervals not exceeding 1.8 m
(6 ft).
f. Equipment grounding for the utilization equipment
is provided by an equipment grounding conductor
within the cable. In cables containing conductors
sized 6 AWG or smaller, the equipment grounding
conductor must be provided within the cable or, at
the time of installation, one or more insulated
conductors must be permanently identified as an
equipment grounding conductor in accordance with
250.119(B).