What term describes a model or set of rules recommended for use?

The term that best describes a model or set of rules recommended for use is "Standard." Standards are established guidelines or criteria that provide specifications and benchmarks for processes, materials, or systems applicable across various industries, including fire safety. They serve to ensure consistency, safety, and reliability in products and services.

In the context of fire alarm systems, standards play a crucial role in specifying the minimum requirements for design, installation, and maintenance practices. These guidelines are typically developed by recognized organizations that engage industry professionals and stakeholders to establish best practices.

Although "Code," "Regulation," and "Protocol" each have specific meanings, they do not encapsulate the general framework intended by the term 'Standard.' Codes often refer to legal or statutory requirements, whereas regulations are more formalized rules enacted by government authorities. Protocols typically denote established procedures or systems for conducting specialized tasks and may not imply the broad applicability or recommendation that a standard signifies.