A regulation or set of regulations.
Model codes in the United States are developed by private standards-making organizations and made available as “models” for adoption by jurisdictions. Model codes are typically developed through a consensus process.
As an example, the National Fire Protection Association has developed – and continues to refine – guidelines for the design and installation of flammable fuel handling facilities: tank spacing, venting requirements, minimum distances from adjoining property, etc. When published by the organization, these guidelines are referred to as a code.
Often, a government agency with rule-making authority will adopt all, or a portion, of a model code developed by a private organization. When this occurs, the codes so adopted take on the force and effect of law within that jurisdiction.