Which types of cables are suitable for general-purpose use, with exceptions for risers and plenums?

The correct choice, which includes OFNG and OFCG, is suitable for general-purpose use due to their construction and installation characteristics. OFNG, or Optical Fiber Non-Conductive (general), is specifically designed for use in general applications where there is no risk of fire propagation. It is suitable for general-purpose installations but does not meet the stricter requirements for spaces like risers or plenums where fire safety is a primary concern.

OFCG, or Optical Fiber General Use with a fire-resistant rating, is designed for general use while providing a higher level of flame resistance compared to other general-purpose cables. While appropriate for many environments, it still doesn't meet the specific standards for risers or plenums where more stringent fire safety protocols are necessary.

This means that both OFNG and OFCG can effectively be utilized in a variety of settings without the fire risk found in more sensitive installations, making them a preferred choice for general-purpose applications.