"A technical standard is an established norm or requirement about technical systems. It is usually a formal document that establishes uniform engineering or technical criteria, methods, processes and practices. In contrast, a custom, convention, company product, corporate standard, etc. which becomes generally accepted and dominant is often called a de facto standard."
"A standard specification is an explicit set of requirements for an item, material, component, system or service. It is often used to formalize the technical aspects of a procurement agreement or contract. For example, there may be a specification for a turbine blade for a jet engine which defines the exact material and performance requirements."
Building codes and knowledge-based solutions with guidelines to meet codes. Cross-referenced collection of building, electrical, mechanical, plumbing, fire, and maintenance codes from BOCA, SBCCI, ICBO, ICC, and NFPA, as well as state and local codes.
National Electrical Code, 2020 by 
National Electrical Code 2020 Handbook, 15th ed. by