Armored Cable (Type AC).
five: for feeders and branch circuits in concealed or exposed installations, in
cable trays, in dry locations, embedded in plaster or brick or other masonry but
not in wet or damp locations, in the air voids of masonry where dry [320.10].
five: where subject to physical damage, in damp or wet locations, in voids
subject to moisture, where exposed to corrosive conditions, embedded in plaster
or brick or other masonry if in wet or damp locations [320.12].
It can't be
less than five times the diameter of the cable [320.24]. However, this doesn't
mean the "final" bending radius. It means that you do not exceed this at any
time during the installation process. Once this radius is exceeded, the AC Cable
is irreparably damaged.
a huge issue. Support requirements are not reduced by dint of using Type AC
Cable. Subsection 320.30, which provides the support requirements for Type AC
Cable, is the largest subsection in Article 320. Type AC cable isn't
indestructible. It may help to think of is as a flexible version of wire that's
been run in EMT or rigid. The walls of the raceway (the metal jacket is really
an integrated raceway, making the wire and jacket a wiring system) are thinner,
in this case. So the need for support and damage protection are, if anything,
greater than for tubing or conduit.