Final answer:
In buildings, plenum-rated or riser-rated Cat5e cables should be used depending on whether the installation is in air handling spaces or runs vertically between floors, complying with local building codes and safety requirements.
Step-by-step explanation:
The type of fire rated Cat5e cable to be used inside buildings is typically classified as plenum or riser rated. Plenum-rated cables, identified by 'CMP' marking, are designed to prevent the spread of flames and limit the amount of toxic smoke released during a fire. They are to be used in air handling spaces such as above ceilings or below floors that are used for air circulation. Riser-rated cables, marked as 'CMR', are engineered for use between floors in non-plenum areas. They are fire-resistant and prevent the fire from traveling up a building.
It is critical to follow local building codes and standards when selecting a Cat5e cable for use in any construction or renovation project. Authorities often require plenum-rated cabling in all areas that handle environmental airflow because it has stricter safety requirements. Whenever cabling is expected to run vertically between floors, riser-rated cabling is generally acceptable unless local codes specify otherwise.