Residential Electrical Wiring Methods

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Residential Electrical Wiring Methods

• Construction Electrical
• Preston High School
• TCJ 3CW
• Feb-07

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Parts of a Circuit

• Source provides electrical energy to the circuit
• Load device that utilizes electrical energy
• Control device used to control the flow of
  electrical energy from the source to the load
• Conductors wires or other materials used as a
  path for electrical energy

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Residential Wiring Types of Conductors

• Neutral Always runs between the load and the
  source
• Live Always runs between the Source and the
  control device
• Control Always runs between the control device
  and the load
• Travelers Always run between two control devices
  in pairs

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Types of Electrical DrawingsOne Line

• One line Drawing shows the type of device and its
  order in the circuit relative to other devices
  and the arrangement in building.
• Are used by electricians to determine cable, box,
  and conduit layouts and sizing
• Do not show how the circuit functions
  electrically

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One line drawing
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Types of Electrical Drawings Schematic / Ladder

• Show the electrical operation of the circuit
• Show the types of devices and the electrical
  connections between them
• Do not show physical layout of materials
• Can be in many formats, we will use a ladder
  format

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Schematic / Ladder
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Types of Electrical DrawingsPictorial Drawings

• Show devices and connections in a pictorial form
• Include the most information and are easy to
  understand, but take time to draw.

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Pictorial Drawings
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Guide lines for Electrical drawings

• All drawings must have a title
• All drawings must have a legend
• All drawings must use colour
• All lines must be made with a straight edge
• All circles must be made with a template or
  compass

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Drawing a ladder diagram

• Make a legend and title for you drawing
• include colours for neutral, live, control, and
  travelers
• Draw a vertical line down the left side of the
  page in the live colour.
• Draw a vertical line down the right side of the
  page in the neutral colour.

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Drawing a ladder diagram 2

• Draw a symbol for each load in the circuit down
  the right side of the page in a column just to
  the left of the neutral line
• Connect each load the neutral with a neutral
  coloured line.

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Drawing a ladder diagram 3

• For each load not controlled by a switch connect
  it to the live with a live coloured line.
• For each load controlled by a switch draw a
  switch on the left side of the page opposite the
  load connect the switch to the live with a live
  coloured line.

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Drawing a ladder diagram 4

• Connect each switch to the load that it controls
  with a control coloured line.

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Drawing a ladder diagram 5

• Travelers are used when one load is controlled by
  2 or more switches.
• The wires that run between the switches are the
  travelers.

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Drawing Pictorial Diagrams

• Pictorial diagrams are drawn in the same manner
  that you would connect the circuit.
• Draw the boxes arranged in a similar way to what
  they will be in the real circuit.

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Drawing Pictorial Diagrams 2

• Draw connecting cables between the boxes in the
  same way you would connect the actual circuit.

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Drawing Pictorial Diagrams 3

• Draw in the devices as they would appear when you
  wire them.
• Following the order neutral, live, control,
  travelers draw in wires between the devices and
  the cables entering each box as they appear in
  you ladder diagram.