Wiring the Desklamp

1
Wiring the Desklamp

• Basics of Wiring

2
Types of Wire

• For this project we will be using two types of
  wire 3 wire and standard lamp wire.
• 3 wire
• The wire is rated in gauges,
• Has an outside insulation,
• May or may not have
• Internal Insulation, such as the fiberglass
• shown in the diagram.

3 wire
3
Types of Wire

• Lamp wire
• Usually a 16 - 18 gauge wire,
• Has a ribbed edge on one side,
• This edge identifies the neutral wire,
• Neutral wire attaches to the silver connector.

Lamp wire
4
Types of Wire

• Each circuit has two to three conductors
• Black wire is hot,
• White wire is neutral,
• Green wire is ground

5
Wiring Basics

• Let's look at what the holes in an outlet do.
• When you look at a normal 120-volt outlet in the
  United States, there are two vertical slots and
  then a round hole centered below them.
• The left slot is slightly larger than the right.
• The left slot is called "neutral, (white)
• the right slot is called "hot" (black) and
• the hole below them is called "ground (green)."
• The prongs on a plug fit into these slots in the
  outlet.

6
Wiring Basics (Activity 1)

• Lets test our wires and plugs.
• Do not AT ANY TIME, Plug in your cable to the
  electrical connections in the classroom,
• In this activity
• The Instructor will instruct you how to correctly
  use a digital multimeter (DMM) to check for
  continuity,
• Then the instructor will provide you with a
  grounded 3 wire cable and a multimeter.
• Using the multimeter check your cable to
  determine
• Which color wire connects to each of the prongs
  on the plug.
• Fill in the blank on the handout for each prong
  and wire.

7
Wiring the Switch
8
Wiring Basics

• Lets identify the parts of our switch
• Grounding Screw,
• Screw Terminals,
• Lever.

9
Wiring Basics

• Wiring the single pole switch.
• In wiring our circuit we will place the switch
  into the black wire of the circuit.
• Our white (or neutral) wire will not be broken,
• Our green (or ground) will be attached to the
  conduit box.

10
Wiring Basics (Activity 2)

• Once the ground wire is connected to the conduit
  box complete the following test
• Do not AT ANY TIME, Plug in your cable to the
  electrical connections in the classroom,
• With the digital multimeter (DMM) check for
• Continuity on each piece of the Desklamp
  skeleton,
• If your Desklamp skeleton does not show
  continuity on each piece, ask the instructor to
  check your wiring for errors.

11
Wiring the lamp

• Next, we will need to wire the lamp socket to the
  switch,
• To do this you will need to modify the lamp
  socket to make it the correct size to slide in
  the conduit.
• Follow the directions provided to you during the
  instructors demonstration to modify the lamp
  socket.
• Once the lamp socket is modified,
• Pull the lamp cord through the Desklamp skeleton,

12
Wiring the lamp socket

• Following the directions previously covered in
  the basic wiring portion of this lesson
• Attach the lamp wire to the lamp socket,
• Make sure that the ridged wire on the lamp cord
  is connected to the silver terminal of the lamp
  socket,
• Make sure that the smooth wire on the lamp cord
  is connected to the brass terminal of the lamp
  socket,
• Attach the lamp wire to the switch,
• Make sure that the smooth wire on the lamp cord
  is attached to the other terminal on the switch
  (opposite the black wire from the 3 wire cable).
• Attach the neutral wires,
• Make sure that the other end of the lamp cord
  ridged wire (from the lamp socket) is attached
  to the white wire from the grounded 3 wire cable.
  Use a wire nut to secure these two wires.

13
Checking your wiring

• Once all the wiring connections have been made,
  conduct the following tests with a digital
  multimeter (DMM)
• Conduct a continuity check with the digital
  multimeter
• Place one probe from the DMM to the wide terminal
  on the end of the 3 wire cable. Place the other
  probe on the lamp socket terminal that has the
  ridged lamp cord wire connected to it. (The DMM
  should buzz)
• Place the probe from the DMM to the narrow
  terminal on the end of the 3 wire cable. Place
  the other probe on the lamp socket terminal that
  has the smooth lamp cord wire connected to it.
  (The DMM should buzz)
• Place the probe from the DMM to the round
  terminal (ground) on the end of the 3 wire cable.
  Place the other probe on each piece of conduit
  that makes up the skeleton of the Desklamp.
  (The DMM should buzz when each piece of the
  Desklamp is touched by the probe. )

14
Final Testing of the Desklamp

• Once you have run all the continuity tests with
  the DMM, take your Desklamp to the instructor for
  one final check.
• The instructor will then plug in your Desklamp
  into the wall outlet.
• Do Not plug your Desklamp into the wall socket
  without first receiving permission from the
  instructor.