A non-jacketed flexible steel conduit has many universal wiring applications. It is often referred to as "greenfield" or "reduced wall flex".
In accordance with CEC rule 12-1002 (1) the flexible metal conduit is permitted in or on buildings of either combustible or non-combustible constructions.
Flexible metal conduit is also permitted for use on industrial machinery where temperatures exceed the limits of liquidtight flexible conduit. (ANSI/NFPA-79) section 16.3.4 (exception) and section 17.9.
