Which term indicates a mandatory requirement according to NFPA definitions?

The term that indicates a mandatory requirement according to NFPA definitions is "Shall." In NFPA documents, "Shall" is used to denote actions or conditions that are required and must be followed to comply with the standard. This implies that if a provision states that something "shall" be done, it is not optional; it must be adhered to in order to meet safety and regulatory standards.

The use of "Shall" establishes clear legal requirements and is critical for ensuring consistency in fire protection and safety practices. Understanding this terminology is essential for professionals working with NFPA standards, as it determines the obligations that must be fulfilled in the design, installation, and maintenance of fire protection systems.