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Chapter 19

Chapter 19. Electrical Plans. Introduction. Electrical plans: 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.

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Chapter 19

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  1. Chapter 19 Electrical Plans

  2. Introduction • Electrical plans: • 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

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

  13. 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

  14. Electrical Schedules

  15. 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?

  16. 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

  17. 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

  18. 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

  19. 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

  20. 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

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