Which term indicates a mandatory requirement according to NFPA definitions?

The term that indicates a mandatory requirement according to NFPA definitions is "Shall." In the context of NFPA (National Fire Protection Association) standards and codes, the use of "Shall" denotes a requirement that is not optional; it signifies that an action must be taken or a condition must be met to comply with the standard. This creates a legal obligation, ensuring that safety practices and procedures are followed consistently in fire protection and related systems.

On the other hand, terms like "Will" imply a future action but do not convey mandatory compliance; "May" suggests a permissible action, indicating that it is optional; and "Should" denotes a recommendation rather than a requirement, allowing for discretion in application. Understanding these nuances is critical for professionals in the field, as adherence to the specified language ensures effective safety measures and compliance with established codes.