Final answer:
The best practice when installing cables for ceiling-mounted projectors where there is no conduit is to use cable raceways, plan the installation carefully, and use appropriate cables for video and power signals.
Step-by-step explanation:
When installing cables for ceiling-mounted projectors where no conduit is present, the best practice is to use cable raceways. Cable raceways are plastic or metal channels that can be mounted to the ceiling or wall, providing a protective path for the cables. This helps to prevent damage to the cables and ensures a neat and organized installation.
Additionally, it is important to consider the type of cables being used. For video signals, HDMI cables are commonly used for projectors. For power cables, it is recommended to use plenum-rated cables, which are designed for use in air handling spaces to prevent fire hazards.
Lastly, it is crucial to plan the cable installation carefully to ensure that the cables are properly routed and secured. This involves measuring and marking the cable path, using appropriate fasteners and supports, and avoiding any sharp bends or excessive tension that could damage the cables.