In which locations is the installation of flexible metal conduit permitted?

The installation of flexible metal conduit (FMC) is permitted in concealed locations because FMC is designed to provide protection for wiring while allowing for flexibility, which is beneficial in areas where rigid conduits cannot be used. When installed in concealed spaces, such as within walls or ceilings, it must still adhere to specific codes and standards that govern the safe use of conduit. This typically involves considerations for moisture, physical damage, and conductor fill.

In contrast, while FMC can be used in exposed locations, outdoor areas, and accessible locations, there are stricter guidelines governing its use in these scenarios, and in many cases, other types of conduits may be preferred. Therefore, the general acceptance of concealed installations provides a clear choice for its usage in environments requiring flexibility and protection combined with a concealed appearance.