Power Point Presentation Publisher The GoodheartWillcox Co Inc
Power. Point Presentation Publisher The Goodheart-Willcox Co. , Inc. Tinley Park, Illinois © Goodheart-Willcox Co. , Inc. 1 Permission granted to reproduce for educational use only
Chapter 23 The Electrical Plan 2 © Goodheart-Willcox Co. , Inc. Permission granted to reproduce for educational use only
Chapter 23 Overview • Introduction • Required Information • Procedure for Drawing an Electrical Plan—Manual Drafting • Procedure for Drawing an Electrical Plan—CADD 3 © Goodheart-Willcox Co. , Inc. Permission granted to reproduce for educational use only
Learning Objectives • Describe an electrical plan and identify its features. • Identify typical electrical symbols found on a residential electrical plan. • Draw an electrical plan for a residential structure using manual drafting techniques. • Draw an electrical plan for a residential structure using CADD. 4 © Goodheart-Willcox Co. , Inc. Permission granted to reproduce for educational use only
Introduction • The purpose of the electrical plan is to show the location and type of electrical equipment to be used. – A plan view in section. – Usually traced from the floor plan. – Shows the meter, distribution panel, outlets, switches, and special features. – Identifies number and types of circuits. 5 © Goodheart-Willcox Co. , Inc. Permission granted to reproduce for educational use only
Required Information • The electrical plans shows: – The service entrance capacity. – Meter and distribution panel. – Location, placement, and type of switches. – Location and type of lighting fixtures. – Special electrical equipment. – Number and type of circuits. – Electrical fixture schedule. 6 © Goodheart-Willcox Co. , Inc. Permission granted to reproduce for educational use only
Required Information • The electrical plan also includes the symbols, a legend (if needed), and notes to describe the systems. • The required amperage rating of the service is shown beside the distribution panel. 7 © Goodheart-Willcox Co. , Inc. (continued) Permission granted to reproduce for educational use only
Common Electrical Symbols 8 © Goodheart-Willcox Co. , Inc. Permission granted to reproduce for educational use only
Service Entrance • Locate service entrance equipment close to the service drop. • The closer the main breaker is to the meter, the better. • Locate close to largest energy users. • Larger loads require larger conductors. • Shorter runs reduce voltage drops. • Locating the meter outside is desired. 9 © Goodheart-Willcox Co. , Inc. Permission granted to reproduce for educational use only
Switches • The number and placement of switches is related to the number of lighting fixtures, switched outlets, equipment. • Select logical location for each switch. • Switches may be toggle, quiet switch, silent mercury switch, or dimmers. • Use proper symbols to show the type of switch. 10 © Goodheart-Willcox Co. , Inc. (continued) Permission granted to reproduce for educational use only
Switches • Switches are shown on the electrical plan connected to the fixtures, appliances, and outlets they operate. • A thin, curved hidden line or centerline is used to show the connection. • These lines do not represent actual wiring, but only the elements connected. • Use SPLINE or POLYLINE in CADD. 11 © Goodheart-Willcox Co. , Inc. Permission granted to reproduce for educational use only
Convenience Outlets • Place outlets every 6' to 8' along all walls. • Outlets are usually 120 volt duplex. • Some duplex outlets may be split-wired to enable one outlet to be switched or each outlet on separate circuits. • They are many types of special purpose outlets. 12 © Goodheart-Willcox Co. , Inc. (continued) Permission granted to reproduce for educational use only
Convenience Outlets • All convenience outlets should be grounded or GFCI to prevent shock. • Convenience outlets may be switched or always “hot. ” • Consider furniture arrangement when locating switches and outlets. • If a symbol is unique, identify it in a legend. 13 © Goodheart-Willcox Co. , Inc. Permission granted to reproduce for educational use only
Lighting • The level, or brightness, of lighting is measured in foot-candles. • Sufficient light should be provided for the expected activity. • Two types of lights are generally used— incandescent light and fluorescent light. – An incandescent light is the traditional screw-in “lightbulb. ” – A fluorescent light has a tube and is popular in kitchens and workshops. 14 © Goodheart-Willcox Co. , Inc. (continued) Permission granted to reproduce for educational use only
Lighting • This reading niche requires special lighting. (Georgia-Pacific Corporation) © Goodheart-Willcox Co. , Inc. 15 (continued) Permission granted to reproduce for educational use only
Lighting • Fluorescent lights are also available to replace screw-in incandescent bulbs. • Glare should be minimized except in closets and storage areas. • Lighting fixtures may be permanently attached to the ceiling or wall. 16 © Goodheart-Willcox Co. , Inc. (continued) Permission granted to reproduce for educational use only
Lighting • The trend is toward more freestanding lamps and fewer ceiling-mounted fixtures. • Consider recessed lighting fixtures for hallways, foyers, or special emphasis. • Track lighting is another option. • Exterior light fixtures should be rated for exterior applications. 17 © Goodheart-Willcox Co. , Inc. (continued) Permission granted to reproduce for educational use only
Lighting • Exterior lighting increases safety. • Plan adequate lighting for walks, drives, porches, patios, and other outside areas. • Use the proper symbol for each lighting fixture at the actual location. • Include a lighting fixture schedule. 18 © Goodheart-Willcox Co. , Inc. Permission granted to reproduce for educational use only
Lighting Fixture Schedule • A typical lighting fixture schedule that includes the necessary information about each fixture. 19 © Goodheart-Willcox Co. , Inc. Permission granted to reproduce for educational use only
Other Devices • Several other electrical devices should be shown on the electrical plan: – Permanent telephone and jacks. – Intercom system. – Home security devices. – TV antenna jack. – Cable or satellite TV jack. – Door chimes. – Audio outlets. 20 © Goodheart-Willcox Co. , Inc. Permission granted to reproduce for educational use only
Branch Circuits • The number and type of branch circuits should be indicated. • Circuit data is generally shown as a note, chart, or diagram on the electrical plan. • It is not necessary to specify the exact circuit for each outlet, but the number of each type should be specified. 21 © Goodheart-Willcox Co. , Inc. Permission granted to reproduce for educational use only
Manual Drafting Procedure • Sequential steps for drawing an electrical plan: 1. Trace all walls and appliances from the floor plan. 2. Locate the meter and distribution panel and indicate voltage and amperage rating. 3. Show all convenience outlets using proper symbols. 22 © Goodheart-Willcox Co. , Inc. (continued) Permission granted to reproduce for educational use only
Manual Drafting Procedure • This part of a residential electrical plan shows the meter, panel box, and other electrical features. (continued) 23 © Goodheart-Willcox Co. , Inc. Permission granted to reproduce for educational use only
Manual Drafting Procedure • Sequential Steps 4. Locate all ceiling and wall lighting outlets using proper symbols. 5. Show all special outlets and fixtures such as telephone, chimes, intercom, security sensors, smoke alarms, data jacks, etc. 6. Locate the switches and connect them to the devices they operate. 24 © Goodheart-Willcox Co. , Inc. (continued) Permission granted to reproduce for educational use only
Manual Drafting Procedure • Part of a residential electrical plan showing special symbols. (continued) 25 © Goodheart-Willcox Co. , Inc. Permission granted to reproduce for educational use only
Manual Drafting Procedure • Sequential Steps 7. Add the lighting fixture schedule and symbol legend, if necessary. 8. List the number and type of circuits required. 9. Letter all other notes, title, scale, sheet number. 10. Check over the drawing. 26 © Goodheart-Willcox Co. , Inc. (continued) Permission granted to reproduce for educational use only
Manual Drafting Procedure • Circuit data can be placed in a chart, such as this one, and included on the electrical plan. 27 © Goodheart-Willcox Co. , Inc. Permission granted to reproduce for educational use only
CADD Drafting Procedure • This electrical plan was drawn using CADD. 28 © Goodheart-Willcox Co. , Inc. (continued) Permission granted to reproduce for educational use only
CADD Drafting Procedure • Sequential steps for drawing an electrical plan: 1. Copy all walls and major appliances from the floor plan to the electrical plan layer. 2. Locate the meter, distribution panel, and telephone junction box. 3. Insert the proper symbols for all convenience outlets. 29 © Goodheart-Willcox Co. , Inc. (continued) Permission granted to reproduce for educational use only
CADD Drafting Procedure • Sequential Steps 4. Insert the proper symbols for all ceiling and wall lighting outlets on the symbols layer. 5. Insert symbols for all special outlets and fixtures—telephone, chimes, security sensors, smoke alarms, data jacks, etc. 6. Insert the proper symbols for all switches on the symbols layer. 30 © Goodheart-Willcox Co. , Inc. (continued) Permission granted to reproduce for educational use only
CADD Drafting Procedure • Sequential Steps 7. Connect switches to the devices they operate—use the POLYLINE command. 8. Add the lighting fixture schedule and symbol legend, if necessary. 9. Add number and type of circuits, notes, title, scale, and sheet number. 10. Check over the drawing. 31 © Goodheart-Willcox Co. , Inc. (continued) Permission granted to reproduce for educational use only
CADD Drafting Procedure • Notice the slight difference in style in this CADD-drawn electrical plan. A rendered view of the building it represents is also shown. (ART, Inc. ) © Goodheart-Willcox Co. , Inc. 32 Permission granted to reproduce for educational use only
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