It addresses Integrated Gas Spacer Cable (Type IGS). It's a factory
assembly of conductors, each individually insulated. The assembly is enclosed in
a loose-fit, nonmetallic flexible conduit as an integrated gas spacer cable. As
the name implies, it's gas-pressurized. Type IGS may be rated up to 600V
Type IGS for use underground, including direct burial. There are three
permissible applications: Service-entrance conductors, Feeder or branch-circuit
conductors, and Service-lateral conductors [326.10].
can't use it for interior wiring or where it would be exposed to contact with
trick question. Because it's buried, you do not support it in the normal NEC
sense. However, you need to follow normal procedures for proper cable burial
and, of course, use good workmanship in the installation.
terminations and splices identified as a type suitable for maintaining the gas
pressure within the conduit [326.40].