in construction of commercial and industrial facilities, the quantity and rating of electrical circuits is usually designed by the ___.

In construction of commercial and industrial facilities, the quantity and rating of electrical circuits is usually designed by the electrical engineer, specifically a state registered professional electrical engineer known as the Engineer of Record for the Electrical Systems Design. This engineer develops the electrical system design criteria, performs the analysis, and is responsible for the overall design, specification, and preparation of electrical documents for the construction project, ensuring safety, efficiency, and code compliance.