An enclosure that contains a luminaire and is supported by entering raceways must be supported by how many conduit(s) threaded wrench-tight into the enclosure or hub(s)?

The requirement for how many conduits must be threaded wrench-tight into the enclosure or hub is rooted in ensuring adequate mechanical support and safety for the luminaire. When an enclosure containing a luminaire is supported by entering raceways, it is essential to use at least two conduits.

This ensures that the luminaire is stable and securely anchored, which is particularly important in installations subject to vibration or movement, such as in commercial or industrial environments. Using only one conduit may not provide sufficient support, increasing the risk of the luminaire becoming loose or detached over time due to stress or external forces.

By mandating a minimum of two conduits, the regulations ensure a higher safety standard by distributing the load more evenly and enhancing the structural integrity of the installation. This requirement helps prevent potential hazards associated with inadequate support in electrical installations.