Are electrical drawings identified with the letter E?

• A. No
• B. Sometimes
• C. Always
• D. Yes

Answer: (D)

Discipline prefixes on drawings show which trade is responsible for that sheet. Electrical drawings are identified with the letter E so you can quickly recognize a sheet belongs to electrical work, separate from mechanical, plumbing, or structural drawings. This prefix appears in the drawing number or title block, helping crews, estimators, and planners route information to the right team and keep changes organized. In typical multi-trade sets, using E to mark electrical content is the standard practice, even though a single-discipline or simplified project might omit prefixes. So, identifying electrical drawings with the letter E is the standard convention.