Can luminaires that require adjusting or aiming after installation be cord connected without an attachment plug?

Luminaires designed to be adjusted or aimed after installation can indeed be cord-connected without an attachment plug, provided certain conditions are met. The primary consideration is that the cord used must be suitable for the specific application and its length must not exceed the limitations set by the National Electrical Code (NEC). Using a suitable cord ensures that the luminaire can handle the electrical load and environmental conditions it may encounter while in use.

Additionally, the installation practices must not interfere with the safe operation of the luminaire or create hazards. Therefore, as long as these criteria are satisfied, it is permissible to connect these types of luminaires with a cord, allowing for flexibility in positioning and adjustment post-installation. This approach fosters practicality in scenarios where the optimum lighting angle is subject to change.

The other options do not align with the NEC's allowances for cord connections in certain installation scenarios. For example, requiring a permanent connection may apply to fixed installations that do not need adjustment, while restricting this flexibility to temporary installations or outright prohibiting them would not take into account the specific needs of adjustable luminaires.