What must be done to conductors to ensure compliance with NEC standards regarding future expansions?

To ensure compliance with NEC standards regarding future expansions, conductors must be arranged for accessibility. This requirement is integral to maintaining the ability to modify or expand electrical systems without significant difficulty. When conductors are accessible, it allows for easier inspection, maintenance, and potential upgrades without the need for extensive modifications to the existing infrastructure. This ensures that any future changes to the electrical system can be implemented effectively and safely.

The other options, while they may address certain characteristics of electrical installations, do not specifically promote the ease of future expansions in the same way that arranging conductors for accessibility does. Proper organization and accessibility facilitate straightforward and efficient work on the electrical system, thus aligning with the NEC's emphasis on safety and practicality in electrical design and installation.