According to the standards, what must be included in the design of installations?

The correct answer highlights the importance of considering future expansions or upgrades as an integral part of the design of electrical installations. This principle is crucial for ensuring that any system can accommodate growth or changes in technology without requiring a complete redesign or incurring significant costs. By factoring in the potential for future enhancements during the initial design phase, installers can save time and resources, ultimately leading to a more efficient and adaptable installation.

This approach aligns with the NEC's emphasis on safety, reliability, and practicality in electrical systems. A forward-thinking design enables facilities to evolve with minimal disruptions, preserving the integrity of the installation and ensuring compliance with current and future codes.

In contrast, while local aesthetics may enhance the visual appeal of an installation, they do not necessarily contribute to its functionality or safety. Limitations on power consumption can be relevant as part of energy efficiency goals, but they do not directly impact the fundamental design requirements. Similarly, prioritizing low-cost materials might compromise the quality and longevity of the installation, which is not in line with the best practices established in the NEC.