In which situation would additional supports be required according to NEC standards?

The situation that necessitates additional supports according to NEC standards is when using Type AC cable. Type AC cable, also known as armored cable, has specific installation requirements to ensure safety and reliability. The armor provides some protection, but the cable itself must be supported and secured at certain intervals to prevent excessive strain or damage. The NEC typically stipulates that Type AC cable should be supported at intervals not exceeding 4.5 feet, and it must also be supported within 12 inches of every outlet box, junction box, or fitting. This requirement is crucial for maintaining the integrity of the electrical installation, especially as improper support can lead to wear and tear, increased risk of damage, and potential safety hazards.

In contrast, other options suggesting length criteria or specific orientations do not consider the specific requirements associated with the type of cable in use, which underscores the importance of understanding the nuances of NEC regulations.