Electrical Planning

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Electrical Planning 6
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Electrical Working Drawings
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Electrical Working Drawings

• Complete electrical plans ensure that electrical
  equipment and wiring are installed exactly as
  planned
  
• If electrical plans are incomplete and sketchy,
  the installation depends upon the judgment of the
  electricians

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Electrical Working Drawings

• Designers should not rely upon electricians to
  design the electrical system, only to install it
  
• Conversely, designers do not plan the position of
  every wire,
  
• only the position and relationship of all
  fixtures, devices, switches, and controls

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Electrical Working Drawings

• This is done with the use of electrical symbols

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Electrical Symbols

• Hundreds of electrical symbols are used on floor
  plans
  
• to describe what and where electrical elements
  will be installed
  
• About sixty symbols apply to residential or light
  construction

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Electrical Symbols

• Although the wiring diagrams detail how a fixture
  is wired to a switch,
  
• these diagrams are abbreviated on architectural
  plans

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Electrical Symbols

• Some floor plans are so filled with dimensions,
  labels, and notes
  
• that there is little space for electrical
  symbols
  
• For this reason,
• only the wall outlines are traced as an outline
  for preparing electrical plans
  

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Electrical Symbols

• On computer-generated floor plans,
• this may involve deleting all but
• the basic wall outline layer

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To draw an electrical plan
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To draw an electrical plan

• 1
• Draw all electrical symbols on an abbreviated
  floor plan
  
• This will prevent interfering with other lines,
  letters, and numbers on a complete floor plan
  
• Electrical symbols are added to the plan in their
  appropriate location
  
• If an exact location is required, this should be
  dimensioned or shown on a separate elevation or
  detail

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To draw an electrical plan

• 2
• After all symbols are located on a plan,
• connect the switches to fixtures
• or devices by drawing a dashed and curved line
• from each switch to the outlet, fixture, or
  device
  
• that the switch controls

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To draw an electrical plan

• 2 Contd
• This line does not represent the actual wiring,
  only the control link
  

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Room Wiring Drawings
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Room Wiring Drawings

• Typical architect5ural wiring diagrams identify
  the various electrical fixtures and devices and
  trace the control of each fixture to a switch
  
• Wiring plans for various rooms and areas in a
  house are shown in Fig. 31-27 a-j

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Room Wiring Drawings

• Because many kitchen appliances are
  heat-producing and therefore require high
  wattages, kitchen outlets are divided among
  several circuits
• Otherwise, two or more appliances could overload
  a circuit when used at maximum load

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Room Wiring Drawings

• Utility rooms also require heavy-duty outlets for
  motor-driven and heat-producing appliances
  
• Bedrooms, bathrooms, and closets require
  comparatively low wattage levels

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Room Wiring Drawings

• Stairs and halls present special problems in
  electrical planning
  
• Three-way switches must be carefully located
• to provide control at many locations
• and thus eliminate unnecessary backtracking

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Room Wiring Drawings

• In drawing electrical plans on a CAD system,
  symbols can be called up from a symbol library
  and copied into the correct position
  
• Electrical symbols are often added by using the
  layering function
  
• This enables the symbols to be plotted in a
  different color or omitted totally from the floor
  plan