Q3-LessonCopy.pptx

What is Circuit
Breaker?
-is an electrical safety
device, a switch that
automatically
the current of an
overloaded electric
circuit, ground faults,

Circuit breakers are not usually
damaged so they can be reset
as opposed to being replaced.
Circuit breakers are used in
residential and in industrial
applications.

Difference between a Circuit Breaker
and a Fuse
A breaker can
be reused until
it wears out.
A fuse can only
be used once.
Fuses are glass cylinders
containing a thin filament, and when
tripped, the filament will burn off or
melt.
01 02
03

Circuit Breaker
vs Fuse
Circuit Breakers
Once an overcurrent event has
been stopped, it can be reset.
They have a higher initial cost.
They require maintenance.
They have optional protective
features such as ground fault

Circuit Breaker
vs Fuse
Fuse
 After interrupting an overcurrent
event, fuses need to be replaced.
 They have a lower initial cost.
 They do not require maintenance.
 The fuse only opens on
overcurrent events.
 They have no capability for
optional protective features.

Parts of a circuit
breaker
Trip Unit or Protective Mechanism
– Also known as the trip unit, this
triggers the operating mechanism
once an electrical fault happens.
Operating Mechanism – Opens or
shuts the breaker to fulfill its
protective role.
Molded Frame – Outer protective
and supportive case of most
breakers. It shelters the other
component of the breaker providing
insulation.

Parts of a circuit
breaker
Arc Chutes/Extinguisher –
Located near the contacts, chutes
prevent damage and mostly heat
from intervening with the circuit
breaker’s functionality and move
apart when a fault occurs
Contacts– There are three types
of contacts: arcing, auxiliary or
main contacts that are used to
ensure optimal airflow inside the
breaker.

Types of Circuit Breakers
1. Standard Circuit
Breakers
The standard circuit breaker works by
cutting off power if the system
reaches a temperature threshold.
Standard circuit breakers cut off power
by using heat-sensitive materials.
When the temperature limit is reached,
it will cause the metal inside to bend,
thus physically cutting off the flow of
electricity. This safety feature helps
ensure that your wire temperature
won’t get too high, making it melt and
causing a fire.
2. GFCI Circuit
Breakers
The GFCI circuit breaker senses an imbalance
in current flow. It is immediately tripped
when it detects such irregularity, like a
grounded wire before someone gets
electrocuted.
-This GFCI circuit breaker is usually
installed in outlets near water sources.
This is because these can be easily
grounded by moisture and cause electric
shock. It can detect even small currents of
four or five milliamps and respond in as
quickly as a tenth of a second.

Types of Standard Circuit Breakers
1. Single Pole
Circuit Breaker
A single-pole circuit
breaker protects 1 wire.
It also has a power
supply of 120/240 volts
and is usually rated
between 15-20 amps. It
is mainly used for non-
heating and low
amperage household
use.
2. Double Pole Circuit
Breakers
A double-pole circuit breaker
has 2 single-pole breakers
and protects 2 wires. It can
handle a power source of
up to 240 volts and is often
rated for 15 to 60 amps. It’s
primarily used for
household circuits requiring
higher voltage or
amperes—like HVAC units
and electric ranges

Wiring a Circuit Breaker
1. Single Pole
Circuit Breaker
2. Double Pole Circuit
Breakers
L
G
L
G
L
G L
G

Troubleshooting Guidelines:
Undervoltage
“When voltage in a ciruit branch
breaker/receptacle outlet is lower than what’s on
the input/main breaker”
 Turn OFF C.O. breaker branch, or it is much safer to turn OFF the
main breaker.***Do not work on panels on a barefoot/wet hands.
 Remove panel cover, check for leakage voltage on covers/screws
before handling it using a tester screw or multimeter.***After
removing cover, turn ON breakers that you have turned OFF. –
Careful not to touch bus bars and terminals.
 Recheck voltage on C.O. breakers.***Set to AC voltage range
1000v/250v
 If it is confirmed that the reading is actually lower on C.O breaker,
turn OFF C.O. breaker and main breaker for safety.
 Popped up or removed the circuit breaker that needed
maintenance/repair/replacement. ***Replace if the problem was
not rectified.
01
What to do when you experience the following?

Troubleshooting Guidelines:
Flickering/Arcing
“When voltage supply is intermittent or lights are
flickering but all receptacles are in good
condition/breakers have an arcing sound”
 Turn OFF C.O./light breaker branch, or it is much safer to turn OFF the
main breaker.***Do not work on panels on a barefoot/wet hands.
 Remove panel cover, check for leakage voltage on covers/screws before
handling it using a tester screw or multimeter.***After removing cover, turn
ON breakers that you have turned OFF. –Careful not to touch bus bars and
terminals.
 Recheck voltage on C.O./light circuit breakers.***Set to AC voltage range
1000v/250v
 If it is confirmed that the reading is intermittent on C.O/light circuit breaker,
turn OFF C.O./light circuit breaker and main breaker for safety.
 Popped up or removed the circuit breaker that needed
maintenance/repair/replacement. ***Replace if the problem was not
rectified.
02
What to do when you experience the following?

Types of Circuit Breakers
2. GFCI Circuit
Breakers
electrocuted.

Circuit Breaker Safety Tips
 For branch circuit-never overload branch
circuit by operating more appliances than
the circuit were design to handle.
 Use correct sixe for breakers, size refers to
amperage rating.

 Disconnect immediately if an
appliances trips a breakers or emits
spark/sizzling sound.
 Never operate an electrical appliance
with bare feet or operate breaker with
wet hands or feet.
 When carrying out any type of repair,
make sure to disconnect electrical

 Try not to use as much as possible an outlet
for each application, not T-taps to avoid
electrical surge.
 If you plan to manipulate installation, turn
OFF circuit breaker and re-check the
absence of voltage.

 Never to use a damage electrical wires which
can cause shocks, accidents/fire.
 Anything unusual like loud noise, humming,
heat, sparking, arcing around the panel is not
common. Inspection should be done.

 Always keep a flashlight with batteries
stationed at circuit breakers panel.
 Keep access to circuit breaker panel
clear.
 Write the number of circuit breaker on
the side of each outlet and switch face
plate with a marker. This way, when
preparing to perform electrical work,
you can be sure to turn OFF the right

What is Electrocution?
-the injury or killing of someone
by electric shock.
-is death or severe injury caused
by electric shock from electric
current passing through the
body.

Its effects can range from pain, muscular
contractions, and difficulty in breathing, to
burns, cardiac arrest, respiratory failure or
death. The severity of injury is primarily
based on three things:
1. the amount of current,
2. the duration of current and
3. the path of current through the body.

Two Points of Contact Electricity requires a complete path
or circuit for current to flow. Two points of contact on the
human body are required for current to enter and exit. In
order for electrical current to flow there must be a voltage
difference between these two points. Without two points of
contact at different voltage levels, no shock will occur.
This is why birds can safely rest on high-voltage utility
wire without getting shocked. They make contact with the
circuit at only one point; both feet are touching the same
wire at the same voltage, so no shock occurs.

There are shoes specifically made for
dangerous electrical work, as well as thick
rubber mats made to stand on while working
on live circuits, but these special pieces of
gear must be in the absolutely clean, dry
condition in order to be effective. Suffice it to
say, normal footwear is not enough to
guarantee protection against electric shock
from a power system.

Research conducted on contact resistance
between parts of the human body and points of
contact (such as the ground) shows a wide range
of figures:
1. Hand or foot contact, insulated with rubber: 20 MΩ typical.
2. Foot contact through leather shoe sole (dry): 100 kΩ to 500 kΩ
3. Foot contact through leather shoe sole (wet): 5 kΩ to 20 kΩ
As you can see, not only is rubber a far better insulating material
than leather, but the presence of water in a porous substance
such as leather greatly reduces electrical resistance.

Ground Fault Circuit Interrupter
GFCI Circuit
Breakers
electrocuted.

Other forms of GFCI
GFCI Outlet- Hotels/Lavatories/any
place inside a residential or
commercial places wherein water
or wet conditions are present.
Universal floor receptacle outlet
(pop-up).

Other forms of GFCI
Portable GFCI

How it Works?
A ground fault is an accidental connection
between a circuit conductor and the earth
(ground).
Causes of ground faults:
•Damaged cords
•Wrong wiring
•Faulty appliances
•Electrical appliances and outlets come in
contact with water.

How it Works?
A ground fault is an accidental connection
between a circuit conductor and the earth
(ground).
A Classic Example of the GFCI at Work. Your toaster is old and has
a loose bare wire inside it touching the outer metal housing. If the
toaster is plugged in, the housing is charged with electricity. You are
cleaning the kitchen and moving counter top items around. When
you touch the toaster housing with one hand while the other hand is
touching a grounded metal object, like a kitchen faucet, you will
receive a life threatening shock! If the toaster was plugged into a
GFCI protected outlet, the power will be turning off before a fatal
shock is delivered through your body.

What are wiring
devices?
A device, based from the
National Electrical Code
(NEC) definition, is a unit
of an electrical system
that is intended to carry,
but not to utilize electric
energy.
“Wiring Devices-
pathways of
electrical current
(AC/DC)”

What are wiring
devices?
This covers a wide assortment
of system components that
include, however not limited to
the following:
Switch Relays
Contactors Receptacles
Conductors
“Wiring Devices-
pathways of
electrical current
(AC/DC)”

How to select wiring devices?
Brand
Select a known industry
manufacturer
Warranty
Look for a multi- year
product warranty
Manual
Always ask for
manufacturer’s manual
Quality
Select wiring devices
which are well-made and
durable
Support
there is an easy and clear
way to contact the
manufacturers support.
Specification
Select wiring devices
according to the job
requirements
04 05 06
01 02 03

SWITCHES
An electrical switch is any
device used to interrupt
the flow of electrons in a
circuit. Switches are
essentially binary devices:
they are either completely
ON (“closed”) or
completely OFF (“open”).

Different Types of Switches
Toggle
Switch
Toggle switches are actuated by a
lever angled in one of two or more
positions. The common light switch
used in household wiring is an
example of a toggle switch
The simplest type of switch is one where two electrical conductors are
brought in contact with each other by the motion of an actuating
mechanism.
Pushbutton
Switch
two-position devices actuated with a button that is
pressed and released. Most pushbutton switches
have an internal spring mechanism returning the
button to its “out,” or “unpressed,” position, for
momentary operation. Some pushbutton switches will
latch alternately on or off with every push of the
button. Other pushbutton switches will stay in their
“in,” or “pressed,” position until the button is pulled
back out.

Selector
Switch
Selector switches are actuated with a
rotary knob or lever of some sort to
select one of two or more positions.
Like the toggle switch, selector
switches can either rest in any of their
positions or contain spring-return
mechanisms for momentary operation.
mechanism.
Dimmer
Switch
A dimmer provides more flexibility with your lighting,
allowing you to change the brightness level of the
bulbs. A rotary dimmer switch, for example, involves
a knob that you rotate to increase or decrease the
brightness. You press the knob to fully turn off (or on)
the light. A sliding dimmer typically includes a toggle
switch that turns on and off the light, along with a
sliding control that turns up or down the brightness

Temperature
Switch
Selector switches are actuated with a
rotary knob or lever of some sort to
select one of two or more positions.
Like the toggle switch, selector
switches can either rest in any of their
positions or contain spring-return
mechanisms for momentary operation.
mechanism.
Floater
Switch
A floating object can be used to actuate a switch
mechanism when the liquid level in a tank rises past a
certain point. If the liquid is electrically conductive, the
liquid itself can be used as a conductor to bridge
between two metal probes inserted into the tank at
the required depth.

Smart Switch
Controlling a light fixture or appliance automatically or remotely.
The term smart switch refers to a new type of wall switch with internal circuitry that allows
light fixtures or appliances to be controlled through one of several non-traditional means—
such as by a voice assistant (such as Alexa) or by an internet app. Many modern smart
switches, for example, can allow you to check on lights and turn them on or off with a
smartphone app from anywhere you have an internet connection. Or they can be
programmed to automatically turn lights or appliances on or off when you choose.
mechanism.

Common Switches, Outlets and other
Electrical Devices or parts.

Now
Venus has a beautiful name and is the second
planet from the Sun. It’s terribly hot—even
hotter than Mercury—and its atmosphere is
extremely poisonous

Ground Fault Circuit Interrupter
Mars
Despite being red,
Mars is a cold place
Jupiter
Jupiter is the biggest
planet of them all
Saturn
It’s composed of
hydrogen and helium
Venus
Venus is the second
planet from the Sun

Major Needs
02
You can enter a subtitle
here if you need it

Predicted Results
25 K 50 K 75 K
Venus Mars Saturn
Follow the link in the graph to modify its data and then paste the new one here. For more info, click here

Sneak Peek
Venus has a beautiful name and is
the second planet from the Sun. It’s
terribly hot—even hotter than
Mercury—and its atmosphere is
extremely poisonous

Our projects
Jupiter
Jupiter is a gas giant and the
fourth planet from the Sun
Saturn
It’s a gas giant composed of
hydrogen and helium

Project Stages
Mars
Despite being red, Mars is
actually a cold place 25%
Jupiter
Jupiter is a gas giant and the
fourth planet from the Sun
Saturn
It’s a gas giant composed of
hydrogen and helium
50%
75%

Our partners
Mercury Venus
Venus has a beautiful name
and is the second planet from
the Sun
Mercury is the closest planet to
the Sun and the smallest one
in the Solar System

Our Team
Mark Doe
John James
You can talk a bit about
this person here
Helen Barry
this person here
this person here

1,050,000
Big numbers catch your audience’s attention

9h 55m 23s
Is Jupiter's rotation period
333,000.000
Earths is the Sun’s mass
386,000 km
The distance between Earth and the Moon
59,000.000
Big numbers are helpful

Mars is actually a very cold place
It’s the farthest planet from the Sun
Mars
Neptune
Know ours projects
Mercury It’s the closest planet to the Sun
Venus Is the second planet from the Sun
Jupiter Jupiter is the biggest planet of them all
Saturn It’s composed of hydrogen and helium
01
02
03
04
05
06

A picture is
worth a
thousand words

Electrical tools
Drill Sander Hammer
Watts
Mercury is a really
small planet
Mars is actually a
very cold place
Venus is the second
planet from the Sun
Joules
Jupiter is the biggest
planet of them all
Saturn is a gas giant
and has rings
Neptune is far away
from Earth

Mobile web
You can replace the image on the
screen with your own work. Just
right-click on it and select
“Replace image”

This is a map
Jupiter
It’s the biggest planet
of them all
Saturn
Saturn is a gas giant
and has several rings
Neptune
Neptune is far away
from Earth
1
1
2
3
2
3

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