Which of the following is not a class of working drawings?

• A. Detail drawings
• B. Assembly drawings
• C. Installation drawings
• D. Electrical drawings

Answer: (D)

Working drawings are the set of drawings used to manufacture, assemble, and install a product. A detail drawing provides the exact size, shape, tolerances, and finishes for one part. An assembly drawing shows how those parts fit together and often includes an exploded view and a bill of materials. An installation drawing describes how the finished assembly is placed and connected in its operating environment, including mounting locations and service connections. Electrical drawings belong to electrical engineering and depict circuits, wiring, and control diagrams, using electrical symbols and conventions. They follow different conventions and are not part of the mechanical set of working drawings. Therefore, electrical drawings are not a class of working drawings in this context.