The document outlines a simple presentation on electrical lighting controls, specifically focusing on 3-way switches which can control a light fixture from two different locations. It explains the operating principles, wiring steps for connecting two 3-way switches, and includes activities for understanding experiences with lighting controls. The presentation aims to enhance appreciation for the usefulness of 3-way switches in building wiring installations.

1. PREPARED BY:
MR. BERNABE C. BONTILAO, RME
A SIMPLE
PRESENTATION
ABOUT ELECTRICAL
LIGHTING
CONTROLS

2. EYE OPENER ACTIVITY
GUESSING A 4 PICTURES IN
ONE WORD

3. _____ _____ _____ _____ _____

5. _____ _____ _____ _____ _____ _____

6. 3-WAY SWITCH

7. Activity
Make a group of 5 members
and list down your
experiences relating to
switching “on” and “off” a
light bulb inside your
household dwellings.

8. Objectives.
At the end of the lesson, you are able
to:
Explain SPDT or 3-way switch;
Describe its operating principle;
Wire two 3-way switches; and
Appreciate the usefulness of 3-way
switches in building wiring
installation.

9. Three-Way Switches
It is a lighting control that can turn
“OFF” or turn “ON” a lighting
fixture in two different locations.
It is called a 3-way switch because
there are 3 conductors connecting
the switches.

10. Parts (terminals) of a 3-way switch
1
traveler
common
0
3
traveler

11. Operating Principle of 3-Way
Switches
Toggling two 3-way switches
will cause a closed path to
open, or an open path to
close.

12. Closed path

13. Open path

14. Toggling Two 3-Way Switches
When the contacts of both
switches are up, the
circuit is complete
1st stage(“on” state)
L1
L2

15. 2nd stage (“on”state)
When the contacts of both
switches are down, the
circuit is complete.
L1
L2

16. 3rd stage (“off” state)
When one contact of the switch is
up and one is down, the current
reaches a dead end, no current
flows, and the bulb is off.
L1
L2
L2
L1
4rth stage (“off” state)

17. 3-way switch application
L2
L1

18. Steps in connecting two 3-way
switches
C
TR3
TR1 TR1
TR3
C
L2
L1
T1
T2
1. Connect the common terminal of the
first 3-way switch to the power source
L1.

19. Steps in connecting two 3-way
switches
C
TR3
TR1 TR1
TR3
C
L2
L1
T1
T2
2. Connect the pair of travelers of the first 3-way
switch to the pair of travelers of the second 3-way
switch.

20. Steps in connecting two 3-way
switches
C
TR3
TR1 TR1
TR3
C
L2
L1
T1
T2
3. Connect the common wire of the second 3-way
switch to one of the terminals of the bulb.

21. Steps in connecting two 3-way
switches
C
TR3
TR1 TR1
TR3
C
L2
L1
T1
T2
4. Connect the second terminal of the bulb to the
source L2.

22. THE END
THANK YOU FOR
LISTENING…

23. Summary
A three-way switch is a lighting control
that can turn “OFF” or turn “ON” a
lighting fixture in two different
locations.
It is called a 3-way switch because
there are 3 conductors connecting the
switches.
Parts (terminals) of a 3-way switch.
Toggling two 3-way switches will cause
a closed path to open, or an open path
to close.

24. Short Quiz. In a ½ sheet of paper,
answer the following.
Describe briefly a 3-way switch.
How does a 3-way switch
operate?
Draw a typical circuit showing
the 4 possible states or stages of
a 3-way switch.

25. Assignment.
Write in a ½ sheet of paper.
1. What is a 4-way switch?
2. How 4-way switches operate?

26. Practice Task
Look for your partner and
perform the actual wiring of two
3-way switches using the
demonstrator to familiarize the
wiring connection.