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Electrical Planning


Electrical plans include data on the type and location of all ... An outdoor weatherproof outlet should be provided on each side of a house ... – PowerPoint PPT presentation

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Title: Electrical Planning

Electrical Planning 5
Developing and Drawing Electrical Plans
Developing and Drawing Electrical Plans
  • Wiring methods are regulated by building codes
  • And wiring is approved and installed by licensed
  • However, wiring plans are prepared by designers

Developing and Drawing Electrical Plans
  • For large structures
  • a consulting electrical contractor may prepare
    the final detailed electrical plans

Developing and Drawing Electrical Plans
  • Electrical plans include data on the type and
    location of all
  • Fixtures
  • Devices
  • Switches
  • and outlets

Fixture and Device Selection
  • Before placing fixture locations on a floor plan
  • the number and type of fixtures needed for each
  • should be determined and listed

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Fixture and Device Selection
  • In addition to lighting fixtures
  • all electrical or electronic devices should also
    be listed
  • This list becomes the basis for developing an
    electrical fixture and device schedule

  • The number, type, and location of switches
    depends on the fixtures and devices
  • Switches control the flow of electricity to
    outlets and to individual devices

Types of Switches
  • Small-appliance circuits and individual circuits
    are usually "hot,"
  • meaning that electricity is available in the
    outlet at all times
  • Lighting circuits, however, may be  either hot or
    controlled by switches

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Types of Switches
  • Single-pole switches control one fixture, device
    or outlet
  • To control lights from two different switches a
    three-way switching circuit (three wires and two
    switches) is used

Types of Switches
  • A three-way switching circuit is often installed
    for the top and bottom of stairways
  • Many types of switch mechanisms are used to
    control circuits

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Switch Locations
  • Switch symbols are located on floor plans
  • Connections to the outlet, fixture, or device
    each controls are shown with a dotted line

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Guidelines for Switch Locations
  • Include a switch for all structural fixtures and
    devices that need to be turned on or off
  • Indicate the height of all switches (usually 4'
    above floor level)
  • Locate switches on the latch side of doors, no
    closer that 2 1/2" from the casing

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Guidelines for Switch Locations
  • Exceptions to the standard should be dimensioned
    on the plan or elevation drawing
  • Select the type of switch, switch mechanism,
    switch plate cover, and type of finish for each
  • Plan a switch to control at least one light in
    each room

Guidelines for Switch Locations
  • Use three-way switches to control lights at the
    ends of stairwells, halls, and garages
  • Locate garage door-closer switches at the house
    entry and within reach inside the garage door
  • Control bedroom lights with a three-way switch at
    the entry and at the bed

Guidelines for Switch Locations
  • Use time switches for garage general lighting,
    bathroom exhaust fans, and heat lights
  • Use three-way switches for all large rooms that
    have two exits. Use four-way switches for rooms
    with more than two exits
  • Use automatic switches on closet and storage
  • Specify timer switches for pool motors

Guidelines for Switch Locations
  • Locate safety alarm switches for a security
    system in the master control unit and in the
    master bedroom
  • Switches for outdoor security lighting (motion
    detector lights) should be installed on all
  • Locate switches in all rooms to ensure that a
    person need not enter or leave a room in the dark

Electrical Outlets and Receptacles
  • The terms outlet and receptacle are often used
  • The NEC defines an outlet as a point in a circuit
    where other devices can be connected
  • A receptacle is a device (at an outlet box) to
    which any plug-in extension line, appliance, or
    device can be connected

Types of Outlets and Receptacles
  • Different types of electrical receptacles and
  • Serve different functions
  • Convenience receptacles
  • Lighting outlets
  • Special-purpose receptacles

Convenience Receptacles
  • Convenience receptacles are used for small
    appliances and lamps
  • These are available in single, double, or

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Lighting Outlets
  • Lighting outlets are for the connection of
  • Lampholders
  • surface-mounted fixtures
  • flush or recessed fixtures
  • and all other types of lighting fixtures

  • Special purpose outlets and convenience outlets
    are connected to hot circuits
  • While lighting outlets are controlled with a
    switching device

  • Ground-fault circuit interrupters (GFCIs) are
    installed in all outlets and switches located
    near water sources

Outlet Locations
  • The positioning of outlets must be consistent
    with local codes
  • In addition to code requirements
  • the following guidelines shown on the next slides
  • should be used for locating outlets

Outlet Location Guidelines
  • Outlets (except in the kitchen) should average
    one every 6' (1.8m) of wall space
  • Kitchen appliance outlets should average one
    every 4' of wall space, be located over
    countertops, and include at least on countertop
    outlet between major appliances
  • Hall outlets should be placed every 15'

Outlet Location Guidelines
  • An outlet should be placed no further than 6'
    from each room corner, unless a door or built-in
    feature occupies this space
  • GFCI outlets should be placed as described
    earlier in this chapter
  • One switched (not hot) outlet should be provided
    in each room

Outlet Location Guidelines
  • Consider furniture placement and positioning of
    portable lamps when placing lighting outlets.
    Room-centered furniture may need floor outlets
  • An outlet should be placed on any wall between
    doors regardless of space

Outlet Location Guidelines
  • The height of all outlets should be noted on the
    electrical plan
  • Exceptions to standard dimensions should be noted
    at each outlet or referenced on an interior wall
  • Normal code height for wall outlets is 12" to 18"
    from the floor
  • Countertop heights are normally 4'-0" above the
    floor line

Outlet Location Guidelines
  • All individual outlets should be labeled with the
    appliance or device served
  • At least one outlet should be placed above each
    bathroom countertop or vanity table
  • A minimum of two outlets should be in each
  • Provide an outlet for each fixture, device, or
    appliance in the plan

Outlet Location Guidelines
  • An outdoor weatherproof outlet should be provided
    on each side of a house
  • Position a waterproof outlet for a patio, pool,
    and a grill
  • Position outside outlets for decorative lighting
    and entry doors, garage, and security lights
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