1. Chapter 19
Electrical Plans

2. Introduction Electrical plans: Electrical installation phases
Display all circuits and systems used by the electrical contractor during installation
May be placed on floor plan or separate
Electrical installation phases
Temporary
Rough-in electrical
Finish electrical

3. Electric Terms and Definitions
Common terms:
Ampere, volt, watt
Box
Breaker
Circuit
Conductor, conduit
Distribution panel
Electrical work
Ground
Junction box
Lighting outlet
Meter and meter base
Outlet
Switch leg
Temporary electric service

4. Electrical Circuit Design
Discuss anticipated electrical needs
Intended use of rooms
Potential furniture placement
Costs and budgets
Electrical code requirements
State size of some circuits and placement of certain outlets and switches

5. Basic Electrical Design Recommendations
Electrical systems
Should be designed for convenience of use and to meet minimum code requirements
Refer to the text for common codes and convenience applications to consider when designing electrical circuits

6. Home Automation Automation:
Controlling and operating mechanical devices other than human power
Types of systems:
Entertainment centers
Computerized programming of house functions
Security systems
Radio frequency systems
Structured wiring systems

7. Electrical Design Considerations
Basic considerations:
Entry and entry foyer
Patios and porches
Living area
Dining room and kitchen
Bedrooms and bathrooms
Laundry/utility room
Office or hobby room
Hallways and stairs
Garage
Outdoor outlets
Crawl spaces
Smoke detectors
Electronics

8. Smoke Detectors
Provide safe exit opportunity through early detection of fire and smoke
UL 217 (Underwriters Laboratories)
NFPA 72 (National Fire Protection Association)
Installed in each sleeping room, and centrally located in a corridor providing access to bedrooms

9. Carbon Monoxide Alarms
Required in new residential construction with fuel-fired appliances or attached garage
UL 2034
Placed outside of each separate sleeping area in immediate vicinity of bedrooms in dwelling units
Installed in accordance with manufacturer’s instructions

10. Universal Electrical Installations
Design accommodating all ages and possible disabilities should be considered
Switch locations
Convenience outlets
Lighting
Communications

11. Electrical Symbols

14. Light Fixture Design and Placement
Lighting options:
General lighting
Uniform down-lighting
Non-uniform down-lighting
Task lighting
Accent lighting
Light scallop
Recessed lighting

15. Reflected Ceiling Plans
Shows features located on ceiling
View if reflected onto a mirror on the floor
Same orientation as related to floor plan
Found in set of construction drawings
Often drawn by interior designers
Typically contains ceiling construction and finish sections, details, and specifications
Also shows special features

16. Electrical Schedules

17. Electrical Wiring Specifications
Service entrance and meter base installation considerations:
What is the service capacity to be installed?
Where is the service entrance to be located?
Where will the meter base be located?
Where will the distribution panel be located?

18. Metrics in Electrical Installations
Electrical conduit designations are expressed in millimeters
Conduit is a metal pipe, fiber pipe, or tube used to enclose a electrical conductors
Produced in decimal inch dimensions
Identified in nominal inch sizes
Nominal size is referred to as conventional size
Actual size remains in inches but labeled in metric

19. Steps in Drawing the Electrical Plan
Draw all light fixtures
Place all electrical outlets
Draw all additional electrical symbols
Letter all switch locations and provide characteristics

20. Steps in Drawing the Electrical Plan (cont’d.)
Draw electrical circuits or switch legs from switches to fixtures using a dashed arc line
Letter all notes, drawing title, and scale
Add general electrical notes, fixture schedules, and symbol legends

21. Drawing the Upper Floor Electrical Plan
Use the same steps to draw upper floor plan electrical layout
Refer to Figure 19-22
Not all offices display an electrical symbol legend, because standard symbols are typically used
Good location for electrical fixture schedules or electrical-related schedules
There are no electrical schedules for the model house

22. Electrical Plan Drawing Checklist
Refer to the text for a electrical plan drawing checklist
Check off items while working on an electrical plan
Ensures everything necessary is included