3Objectives 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.
4Electrical PlanElectrical plan shows location and type of electrical equipment to be usedPlan view sectionUsually traced from floor planShows meter distribution panel, outlets, switches, and special featuresIdentifies number and types of circuits
5Required Information Number, type of circuits Service entrance capacityMeter, distribution panel locationLocation, placement, type of switchesLocation, type of lighting fixturesSpecial electrical equipmentNumber, type of circuits
6Required Information Electrical fixture schedule Symbols, legends, and notesRequired amperage rating of service is shown beside distribution panel
8Service EntranceLocate service entrance equipment close to service dropMain breaker should be close to meterLocate service entrance close to largest energy usersLarger loads require larger conductorsShorter runs reduce voltage drops
9Employability Negotiation Process of coming to agreement on an issue that requires all parties to give and take a little to achieve intended resultBegins with trying to understand the other person’s interestsTogether try to reach possible solutions that meet mutual concerns
10MetersOutside location is preferred, but meter can be located inside or outsideSmart meters can be read remotely by utility company
11SwitchesNumber and placement of switches is related to number of lighting fixtures, switched outlets, and equipmentSelect logical location for each switchUse proper symbols to show type of switch
12SwitchesOn electrical plan, switches are shown connected to fixtures, appliances, and outlets they operateThin, curved hidden line or centerline shows connectionLines do not represent actual wiring, but only elements connectedUse SPLINE or POLYLINE in CADD
13Receptacle Outlets Place outlets every 6' to 8' along all walls Outlets are usually 120-volt duplexSome duplex outlets may be split-wiredReceptacle outlets should be grounded or GFCI to prevent shock
14Receptacle Outlets Receptacle outlets may be switched or always “hot” Consider furniture arrangement when locating switches and outlets
15Special-Purpose Outlets Special-purpose receptacle outlets may have one or several receptaclesUnique symbols should be identified in a legend
16Traditional Lighting Two types of lights have been commonly used Incandescent lightScrew-in bulbFluorescent lightTube
17Energy-Efficient Alternatives Compact fluorescent lightbulbs (CFLs)Contain mercuryLight-emitting diode (LED) lightsMultiple colors; many usesElectronic-stimulated luminescence (ESL) lightsUp to 70% more energy-efficient than incandescent bulbs
18Lighting FixturesTrend is toward more freestanding lamps and fewer ceiling-mounted fixturesRecessed lighting fixtures for hallways, foyers, or special emphasisTrack lighting is another option
19Exterior LightingExterior light fixtures should be rated for exterior applicationsPlan adequate lighting for:WalksDrivesPorchesPatiosOther outside areas
20Lighting Fixture Schedule Use proper symbol for each lighting fixture at actual locationInclude lighting fixture schedule in electrical plan
21Green Architecture Phasing out the incandescent lightbulb In United States, higher-energy bulbs were restricted first, with phase-out to be completed in 2014Some bulbs are exempt from restrictions, such as appliance lampsKeep up-to-date with new technologies and incorporate them into designs when possible
22Other Devices Telephone jacks Intercom system Home security devices TV antenna jackCable or satellite TV jackDoor chimesAudio outlets
23Branch CircuitsElectrical plan indicates number and type of branch circuitsCircuit data is generally shown as note, chart, or diagram on electrical planNumber of lighting, small-appliance, and individual circuits should be listed
24Manual Drafting: Electrical Plan Trace exterior and interior walls and major appliances from floor plan.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.
25Manual 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.
26Manual 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.
28CADD: Electrical PlanIf 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.
29CADD: Electrical Plan2. 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.
30CADD: Electrical Plan4. 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.
31CADD: Electrical PlanConnect 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.Add lighting fixture schedule and symbol legend, if needed.
32CADD 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.