Which of the following signifies an exception in the NEC?

An alternate requirement signifies an exception in the National Electrical Code (NEC). In the context of the NEC, an alternate requirement is provided to address unique situations that may not fit the standard provisions outlined in the code. This allows for flexibility in application while still ensuring safety and compliance with the overall intent of the NEC.

Alternate requirements are often specified to accommodate particular types of installations or circumstances that may need special consideration due to various factors, including different technologies, materials, or environmental conditions. By having a clear alternate requirement, the code provides a pathway for compliance through different means, which can be critical in ensuring that electrical installations are safe and functional under various conditions.

The other options may resemble exceptions in some contexts but do not specifically carry the same implication or authority as an alternate requirement in the NEC framework. For example, a statement following a list may provide clarification or further detail but does not inherently signify an exception. Similarly, a special note in the margin can provide important information or guidance but is not an official basis for an exception. An additional section at the end may contain supplementary information but does not necessarily imply an exception within the provisions laid out in the code.