1. Electrical Plans

2. Electrical Plans
Displays all of the circuits and systems to be used by the electrical contractor during installation
Items to show on plans
all outlets
all light fixtures connected to switches
all switches connected to light fixtures
all miscellaneous and low voltage items
no connection necessary with low voltage items
power panel and electrical meter

3. Electrical Plans Methods used to show electrical systems on drawings
1 Add-on existing plans along with all other symbols, information, and dimensions
common practice on simple floor plans
eliminates extra sheets and simplifies working drawings
sometimes makes drawings difficult to read
2 Separate sheets for electrical information
common practice on complex floor plans
separates electrical information from other drawing data
requires time to duplicate floor plans unless CAD dwgs
adds more blueprints to set of working drawings
Use for class

4. Electrical Plans Example

5. Size and Drafting the Symbols
As noted on handout (units given below are full size units taken from the 16 scale)
Size of outlet symbol = 1/8” diameter circle
Size of light fixture symbol = 1/4” diameter circle
Size of fluorescent symbol = 1/8” x 1” (6”x48” real size)
Size of switch symbol = 1/8” lettering
Size of push button symbol = 3/16” square
Size of electrical panel = 3/8”long and fill 1/2 of wall
Size of meter base, etc. = 1/4” square

6. Outlets Symbol Wall View Description as shown on plan finished state
explanation

7. Duplex Outlet with Switch

8. Appliance vs. Voltage and Symbol
Refrigerator 120 volts
Stove volts
Hood volts
Oven volts
Garbage Disposal 120 volts
Dishwasher 120/240 volts R H GD O

9. Appliance vs. Voltage and Symbol
Clothes washer 120 volts
Clothes dryer 240 volts
Air Conditioner 120/240 volts
Water heater 240 volts
Furnace 120/240 volts AC WH F

10. Light Fixtures Ceiling/Wall fixtures Fan (exhaust) Junction box
surface
recessed
Fan (exhaust)
Junction box
Fluorescent fixtures

11. Switches Single Switch 3-way Switch 4-way Switch Dimmer Switch
Timer Switch

12. Electrical Symbols - Miscellaneous

13. Electrical Code/Drafting Practice
Duplex convenience outlets (wall plugs) should be a maximum of 12’ apart. Closer spacing is desirable, although economy is a factor. Code reads: “no point along a wall is further than 6’ from an outlet.”
Duplex convenience outlets should be no more than 6’ from a corner
There should be a duplex outlet in any usable wall space over 2’ long
Place a (one) duplex outlet in a hallway

14. Outlet Placement Example

15. Electrical Code/Drafting Practice
Kitchen /Bathroom areas
usable counter space of 12” & greater require an outlet
outlets are required every 48” of counter space (with new code text is in error)
note mounting height for outlets above counter (+44”)
special purpose outlets for garbage disposal, dishwasher, separate oven, and hood
range outlet for electric range
GFI or GFCI protection for any outlets in rooms with a water source.

16. Switch/Outlets Examples

17. Switching Examples

18. Switching
Switch symbol and fixture are connected with a dashed line using a irregular curve
Single Switching
3-Way Switching
4-Way Switching

19. Switching an Outlet

20. Switching a Porch Light
+(MOUNTING HEIGHT)

21. Electrical Plan Example

22. Special Project Elect Plans (50 Points)
Add electrical symbols and all electrical information to your plans:
Foundation plan (3 light +switch, one outlet and special purpose outlet for water heater)
First level floor plan (two exterior WP outlets, lights at all entrances, elect range w/ hood above, garbage disposal, dishwasher outlet, and washer/dryer outlets)
Second level floor plan (exhaust fans in bathrooms, 3-way switch to 1st floor for stair light)
Complete an electrical schedule (10 points) for all the symbols used similar to one shown in Handout

23. Electrical Symbol Schedule
Purpose of schedule is to identify and describe electrical symbols used in the set of working drawings
Categories
Symbols
Descriptions