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29 Electrical Plans Chapter Permission granted to reproduce for educational use only.© Goodheart-Willcox Co., Inc. Objectives Describe an electrical.

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Presentation on theme: "29 Electrical Plans Chapter Permission granted to reproduce for educational use only.© Goodheart-Willcox Co., Inc. Objectives Describe an electrical."— Presentation transcript:

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2 29 Electrical Plans Chapter

3 Permission granted to reproduce for educational use only.© Goodheart-Willcox Co., Inc. 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 Permission granted to reproduce for educational use only.© Goodheart-Willcox Co., Inc. Electrical Plan Electrical plan shows location and type of electrical equipment to be used –Plan view section –Usually traced from floor plan –Shows meter distribution panel, outlets, switches, and special features –Identifies number and types of circuits

5 Permission granted to reproduce for educational use only.© Goodheart-Willcox Co., Inc. Required Information Service entrance capacity Meter, distribution panel location Location, placement, type of switches Location, type of lighting fixtures Special electrical equipment Number, type of circuits

6 Permission granted to reproduce for educational use only.© Goodheart-Willcox Co., Inc. Required Information Electrical fixture schedule Symbols, legends, and notes Required amperage rating of service is shown beside distribution panel

7 Permission granted to reproduce for educational use only.© Goodheart-Willcox Co., Inc. Common Electrical Symbols

8 Permission granted to reproduce for educational use only.© Goodheart-Willcox Co., Inc. Service Entrance Locate service entrance equipment close to service drop Main breaker should be close to meter Locate service entrance close to largest energy users Larger loads require larger conductors Shorter runs reduce voltage drops

9 Permission granted to reproduce for educational use only.© Goodheart-Willcox Co., Inc. Employability Negotiation –Process of coming to agreement on an issue that requires all parties to give and take a little to achieve intended result –Begins with trying to understand the other persons interests –Together try to reach possible solutions that meet mutual concerns

10 Permission granted to reproduce for educational use only.© Goodheart-Willcox Co., Inc. Meters Outside location is preferred, but meter can be located inside or outside Smart meters can be read remotely by utility company

11 Permission granted to reproduce for educational use only.© Goodheart-Willcox Co., Inc. Switches Number and placement of switches is related to number of lighting fixtures, switched outlets, and equipment Select logical location for each switch Use proper symbols to show type of switch

12 Permission granted to reproduce for educational use only.© Goodheart-Willcox Co., Inc. Switches On electrical plan, switches are shown connected to fixtures, appliances, and outlets they operate Thin, curved hidden line or centerline shows connection –Lines do not represent actual wiring, but only elements connected Use SPLINE or POLYLINE in CADD

13 Permission granted to reproduce for educational use only.© Goodheart-Willcox Co., Inc. Receptacle Outlets Place outlets every 6' to 8' along all walls Outlets are usually 120-volt duplex Some duplex outlets may be split-wired Receptacle outlets should be grounded or GFCI to prevent shock

14 Permission granted to reproduce for educational use only.© Goodheart-Willcox Co., Inc. Receptacle Outlets Receptacle outlets may be switched or always hot Consider furniture arrangement when locating switches and outlets

15 Permission granted to reproduce for educational use only.© Goodheart-Willcox Co., Inc. Special-Purpose Outlets Special-purpose receptacle outlets may have one or several receptacles Unique symbols should be identified in a legend

16 Permission granted to reproduce for educational use only.© Goodheart-Willcox Co., Inc. Traditional Lighting Two types of lights have been commonly used Incandescent light –Screw-in bulb Fluorescent light –Tube

17 Permission granted to reproduce for educational use only.© Goodheart-Willcox Co., Inc. Energy-Efficient Alternatives Compact fluorescent lightbulbs (CFLs) –Contain mercury Light-emitting diode (LED) lights –Multiple colors; many uses Electronic-stimulated luminescence (ESL) lights –Up to 70% more energy-efficient than incandescent bulbs

18 Permission granted to reproduce for educational use only.© Goodheart-Willcox Co., Inc. Lighting Fixtures Trend is toward more freestanding lamps and fewer ceiling-mounted fixtures Recessed lighting fixtures for hallways, foyers, or special emphasis Track lighting is another option

19 Permission granted to reproduce for educational use only.© Goodheart-Willcox Co., Inc. Exterior Lighting Exterior light fixtures should be rated for exterior applications Plan adequate lighting for: –Walks –Drives –Porches –Patios –Other outside areas

20 Permission granted to reproduce for educational use only.© Goodheart-Willcox Co., Inc. Lighting Fixture Schedule Use proper symbol for each lighting fixture at actual location Include lighting fixture schedule in electrical plan

21 Permission granted to reproduce for educational use only.© Goodheart-Willcox Co., Inc. Architecture Phasing out the incandescent lightbulb –In United States, higher-energy bulbs were restricted first, with phase-out to be completed in 2014 –Some bulbs are exempt from restrictions, such as appliance lamps –Keep up-to-date with new technologies and incorporate them into designs when possible Green

22 Permission granted to reproduce for educational use only.© Goodheart-Willcox Co., Inc. Other Devices Telephone jacks Intercom system Home security devices TV antenna jack Cable or satellite TV jack Door chimes Audio outlets

23 Permission granted to reproduce for educational use only.© Goodheart-Willcox Co., Inc. Branch Circuits Electrical plan indicates number and type of branch circuits Circuit data is generally shown as note, chart, or diagram on electrical plan Number of lighting, small-appliance, and individual circuits should be listed

24 Permission granted to reproduce for educational use only.© Goodheart-Willcox Co., Inc. Manual Drafting: Electrical Plan 1.Trace exterior and interior walls and major appliances from floor plan. 2.Locate meter and distribution panel. Indicate voltage and amperage rating. Locate telephone junction box and home security or automation wiring enclosure. Check building code requirements.

25 Permission granted to reproduce for educational use only.© Goodheart-Willcox Co., Inc. Manual Drafting: Electrical Plan 3. Show all receptacle outlets using proper symbols. 4. Locate all ceiling and wall lighting outlets. Use standard lighting symbols. 5. Show all special-purpose outlets and fixtures. 6. Locate switches and connect them to outlets and lighting fixtures they operate.

26 Permission granted to reproduce for educational use only.© Goodheart-Willcox Co., Inc. Manual Drafting: Electrical Plan 7. Add lighting fixture schedule and symbol legend, if needed. 8. Note number and type of circuits required. 9. Letter all other notes and title, scale, and sheet number. 10. Check drawing for accuracy and completeness.

27 Permission granted to reproduce for educational use only.© Goodheart-Willcox Co., Inc. Residential Electrical Plan

28 Permission granted to reproduce for educational use only.© Goodheart-Willcox Co., Inc. CADD: Electrical Plan 1.If electrical plan is to be a separate file, open floor plan drawing and save it with new name. If combining electrical plan with floor plan, create set of layers specifically for electrical plan and lock or freeze all other layers.

29 Permission granted to reproduce for educational use only.© Goodheart-Willcox Co., Inc. CADD: Electrical Plan 2. Locate meter and distribution panel. Indicate voltage and amperage rating. Locate telephone junction box and home security or automation wiring enclosure. Double-check local building codes. 3. Insert symbols for receptacle outlets, placing them on electrical symbols layer. Indicate receptacle types.

30 Permission granted to reproduce for educational use only.© Goodheart-Willcox Co., Inc. CADD: Electrical Plan 4. Insert symbols for ceiling and wall lighting outlets on electrical symbols layer. 5. Insert symbols for special-purpose outlets and fixtures on the electrical symbols layer. 6. Insert symbols for switches on electrical symbols layer.

31 Permission granted to reproduce for educational use only.© Goodheart-Willcox Co., Inc. CADD: Electrical Plan 7.Connect switches to outlets and lighting fixtures they operate. Use hidden or centerline linetype with SPLINE command or Spline option of POLYLINE command. Place these lines on separate layer to achieve proper line width when plotting. 8.Add lighting fixture schedule and symbol legend, if needed.

32 Permission granted to reproduce for educational use only.© Goodheart-Willcox Co., Inc. CADD Drafting Procedure 9. Add note indicating number and type of required circuits. Create other notes and add title, scale, and sheet number. Place specific notes on their own layer. 10. Check drawing for accuracy and completeness.

33 Permission granted to reproduce for educational use only.© Goodheart-Willcox Co., Inc. Residential Electrical Plan Drawn Using CADD


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