NATIONAL CAD STANDARD FOR ELECTRICAL DRAWINGS

1. Layering

Layer Names: The NCS uses a hierarchical system for layer names, such as E-POWR for power systems, E-LITE for lighting systems, and so forth.

Layer Filters: Helps in managing complex drawings by filtering layers based on their purpose.

2. Symbols

Standard Symbols: Symbols for various electrical components like switches, outlets, lights, and junction boxes are standardized.

Symbol Libraries: CAD software often comes with libraries that include these standardized symbols, ensuring consistency.

3. Annotations

Text Styles: Typically, a simple, legible sans-serif font like Arial or Helvetica is used.

Annotation Blocks: Predefined blocks for common annotations help maintain uniformity.

4. Drawing Set Organization

Title Blocks: Standard title block formats including project information, sheet number, and drawing title.

Sheet Order: General to specific order (e.g., general notes, plans, details, schedules).

5. Sheet Identification

Sheet Numbering: A systematic approach like E101 for the first electrical plan, E102 for the second, etc.

Discipline Designators: Using E for electrical, P for plumbing, etc., helps in quickly identifying the type of drawing.

6. Dimensioning and Notation

Dimension Styles: Consistent styles for dimension lines, extension lines, and arrows.

Units: Typically, dimensions are given in feet and inches in the US, or in metric units elsewhere.

7. File Naming

Standardized Conventions: A file naming system like ProjName_Discipline_SheetNumber.dwg helps in easily managing and sharing files.