10 EIM Q2M1 TLE10 EIM Q2 Mod1 Wk1-5
Elec-Meter-Connection-and-Grounding v3
Education (University of Caloocan City)
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10
NOT
TECHNOLOGY AND
LIVELIHOOD EDUCATION
Industrial Arts-Electrical Installation
and Maintenance
Quarter 2 - Module 1
Electrical meter connection and
grounding
Department of Education ● Republic of the Philippines
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11
Technology and Livelihood Education Industrial Arts-Electrical Installation and
Maintenance Grade 10
Alternative Delivery Mode
Quarter 2 - Module 1: Electrical meter connection and grounding
First Edition, 2020
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Technology and
Livelihood Education
QUARTER 2- MODULE 1
Industrial Arts
Electrical Installation and
Maintenance
Service entrance and circuit breaker/safety switch
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Introductory Message
For the facilitator:
Welcome to the Electrical Installation and Maintenance 10 Alternative Delivery Mode
(ADM) Module on, Install Standard Electrical Protection System For Lighting And
Grounding: Electrical meter connection and grounding
This module was collaboratively designed, developed and reviewed by educators
from public to assist you, the teacher or facilitator in helping the learners meet the
standards set by the K to 12 Curriculum while overcoming their personal, social, and
economic constraints in schooling.
This learning resource hopes to engage the learners into guided and independent
learning activities at their own pace and time. Furthermore, this also aims to help
learners acquire the needed 21st century skills while taking into consideration their
needs and circumstances.
In addition to the material in the main text, you will also see this box in the body of
the module:
Notes to the Teacher
For the learner and for the Parents;
Welcome to the Electrical Installation and Maintenance 10 Alternative Delivery Mode
(ADM) Module on, Install Standard Electrical Protection System For Lighting And
Grounding.
The hand is one of the most symbolized part of the human body. It is often used to
depict skill, action and purpose. Through our hands we may learn, create and
accomplish. Hence, the hand in this learning resource signifies that you as a learner
is capable and empowered to successfully achieve the relevant competencies and
skills at your own pace and time. Your academic success lies in your own hands!
This module was designed to provide you with fun and meaningful opportunities for
guided and independent learning at your own pace and time. You will be enabled to
process the contents of the learning resource while being an active learner.
iii
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This module has the following parts and corresponding icons:
What I Need to
Know
What I Know
This will give you an idea of the skills or
competencies you are expected to learn in the
module.
This part includes an activity that aims to check
what you already know about the lesson to take.
If you get all the answers correct (100%), you
may decide to skip this module.
This is a brief drill or review to help you link
the current lesson with the previous one.
What’s In
What’s New
In this portion, the new lesson will be
introduced to you in various ways such as a
story, a song, a poem, a problem opener, an
activity or a situation.
This section provides a brief discussion of the
lesson. This aims to help you discover and
understand new concepts and skills.
What is It
What’s More
This comprises activities for independent
practice to solidify your understanding and
skills of the topic. You may check the answers
to the exercises using the Answer Key at the end
of the module.
What I Have
Learned
This
includes
questions
or
blank
sentence/paragraph to be filled in to process
what you learned from the lesson.
What I Can Do
This section provides an activity which will
help you transfer your new knowledge or skill
into real life situations or concerns.
Assessment
This is a task which aims to evaluate
your level of mastery in achieving the
learning competency.
iv
Additional
Activities
Answer Key
In this portion, another activity will be given to
you to enrich your knowledge or skill of the
lesson learned. This also tends retention of
learned concepts.
This contains answers to all activities in
the module.
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v
Table of Contents
Page
COVER PAGE
COPYRIGHT PAGE
TITLE PAGE
TABLE OF CONTENTS
Lesson 1: Electrical meter connection
What I Need to Know
What I Know
What’s In
What’s New
What Is It
What’s More
What I Have Learned
What I Can Do
Additional Activities
1
1
2
2
3
6
7
7
9
Lesson 2: Electrical grounding
What I Need to Know
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What I Know
What’s In
What’s New
What Is It
What’s More
What I Have Learned
What I Can Do
Additional Activities
10
11
11
12
16
17
17
19
Post-Test .................................................................................................................................. 20
Key to Answers ......................................................................................................................... 23
References .................................................................................................................................24
Vi
What I Need to Know
This module was designed and written to help you master the learning
competencies in TLE-EIM 10. The scope of this module permits it to be used on
different situations.
This module covers the knowledge, skills, and attitudes required in installing a
standard electrical protection system for lighting and grounding(EP)
After going through this module, you are expected to perform:
• Electrical meter connection and grounding
• Follow safety procedure
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vii
What I Know
Pre-Test
I- Multiple choice: Choose the letter of the best answer. Write the chosen letter on a
separate sheet of paper.
1.
A.
B.
C.
D.
2.
What does electric meter measures?
Amount of resistance
Amount of energy consumption
Amount of Power
Amount of Voltage
Which is the symbol of the standard unit of electricity supplied to the consumer,
which is equal to 1 kilowatt acting for 1 hour?
A. kWh
B. mAh
C. Mbp
D. Hz
3. How many dial/s are there in an analog electric meter?
A. 5
B. 6
C. 7
D. 8
4. Santos family has a record of 09877 for the previous electric bill, and the current
billing reads 09897 for the consumption in one month. Which is the total electric
consumption of the family?
A. 18 kWh B. 19 kWh C. 20 kWh
D. 21kWh
5. Meter box may be installed not less
in height.
A. 4 ft
B. 5 ft
C. 6 ft
D. 7 ft
6. How long is the grounding rod?
A. Less than .5 m B. 1.2 m to 2.5 m C. 3.5 m
D. more than 3.5 m
7. Electrical system is grounded in order to protect
from faults.
A. Electrical equipment
B. Humans
C. Both Electrical Equipment and Humans
D. Neither Electrical Equipment nor Humans
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8. High Resistance grounding typically limits ground fault current under to
A. 25A
B. 100A
C.
50A
D.
500A
9.
A.
B.
C.
D.
Which of the following grounding system, identification of fault is tedious?
Resistance grounding
Solid grounding
Reactance grounding
Ungrounding
A.
B.
C.
D.
The size of the earth or ground wire is based on the
maximum fault current carrying through the ground wire
rated current carrying capacity of the service line
depends on the soil resistance
both (A) and (C)
10.
:
viii
II-I dentification: Identify the labeled parts, choose your answer from the word box
A. Metering Connection
Meter ground, Ground rod, meter prongs, service lateral, meter base, breaker box,
service entrance, breaker, meter
1.
2.
3.
4.
5.
6.
7.
8.
9.
III-Matching Type: Match column A with column B
A
1. Electricity Flat-rate Meter
2. Electricity Interval Meter
B
a. With 3 types known as net meters, bidirectional and generation meter.
b. measure your energy digitally, and can
calculate not only the amount of electricit y
used, but when this energy was
consumed, no need for a meter reader to
come by your property
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3. Electricity Smart Meter
c. more advanced than traditional types
records energy use in half-hour intervals.
They often have a digital display.
4. Solar Meter
d.
Also known as an ‘accumulation meter,
these types of meters record your
electricity consumption since the meter
was first installed
x
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Lesson
1
Electrical Meter Connection
What I Need to Know
Metering installations are required to effectively register electrical power
delivered to consumers. As an electrician, you must have an ample knowledge
pertaining to metering connections.
OBJECTIVES
At the end of the lesson, you should be able to:
1. Identify parts of electric meter and its type.
2. Choose appropriate materials needed for metering connections.
3. Observe safety while working with electrical job.
What I Know
Figure 1, shows an example of electric meter connection,
1. What part of the connection where electric
meter is inserted? (select number from 1
through10)
2. Why do we need to connect the ground rod as
indicated by number 5 in figure 1?
Figure 1
1
What’s In
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In your past lessons, you have learned different symbols used in an electrical
plan as your bases for installation. As you go on, you must be an insightful viewer for
you to have the option to share experiences dependent on the thoughts introduced
in the materials you are going to see.
M
M
A
B
1. Which symbol is used to represent energy meter in an electrical plan?
2. Why do symbols were used instead of real picture in an electrical plan?
Symbol A is an electric motor, therefore Symbol B is basically used in
representing energy meter in an electrical plan. Using symbols makes representation
simpler and easy to understand.
What’s New
Take a look at the figure below, it shows different energy meter.
A
B
Figure 2
https://www.waterheatertimer.org/how to install electric meter
Which one is installed in your home? Where does the meter reader look for power
consumption?
2
What Is It
What is an Electricity Meter?
An electricity meter, electric meter,
electrical meter, or energy meter is a
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device that measures the amount of electric energy consumed by a residence, a
business, or electrically powered devices. It measures electricity consumption in
kilowatt-hours(kWh). Your billing will be based on the differences between two
consecutive readings, by subtracting the most recent with the previous one.
Typically a meter is installed at the point where the power lines enter your
building. It consists of prongs plugged into the meter base, a meter number which is
registered to a specific consumer, a register which record power consumption,
transparent cover that protects mechanism, a seal that serves as authentication to
prevent tampering, and a nameplate that bears the manufacturer.
6/13/2020 https://www.waterheatertimer.org/how to install electric meter
4 Types of Electric Meter
Currently, there are four types of electrical meter available in the market. Most
of us have a traditional type of reader, known as an accumulation meter or flat-rate
meter. Below, you can read more about each meter type, how they work, and what
they look like and decide what to install in your household.
Electricity Flat-rate Meter
Also known as an ‘accumulation meter’, these types of meters
record your electricity consumption since the meter was first
installed. If you have a flat-rate meter, you will need to read
your energy usage by checking how much energy your
household consumed since last checking it. A technician will
need to visit your property to physically check the meter and
record the data[2].
https://www.waterheatertimer.org/how to install electric meter
Figure 3
3
Electricity Interval Meter
Interval meters are more advanced than traditional types
such as flat-rate meters. Rather than measuring data
electromagnetically (that is, with a traditional spinning disc)
they record data electronically. They are called 'interval
meters' as they can record energy use in half-hour intervals.
They often have a digital display.
Figure 4
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Electricity Smart Meter
Figure 5.
Smart meters measure your energy digitally and can
calculate not only the amount of electricity used, but
when this energy was consumed, it contains a
communication chip that sends meter reading data by radio
signal to a mobile collector.
7/19/2020 https://commons.wikimedia.org/wiki/
Solar Meter
There are 3 meters available for solar
meter, these are net meters-shows the net
consumption, bi-directional meters-with 3
screens (first-test screen, second-shows
power coming into the grid and third-shows
power going out to the grid from your solar)
and dual meters-with two separate
meters( first is usage meter and the second
is production or generation meter).
https://electricityandgas.com.au/guide/electricity-meter/ 7/19/2020
Figure 6
4
Materials and devices used in meter installation
A meter box is a device used to house a building's electrical meter.
https://www.youtube.com/watch?v=_yxOG6GUWVA
Adapter/Locknut -Use to secure rigid and IMC conduit and
various threaded fittings to steel outlet boxes and other metal
enclosures. Zinc plated for corrosion resistance, these conduit
locknuts can be used for outdoor applications.
(RSC or EMT pipe 3/4″” dia)Conduit, usually fabricated of
steel, which encloses electrical wiring, thereby protecting the
wiring from outside damage.
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Clamps/Straps
conduit clamps or pipe clamps allow the pipes to be safely
attached to walls or ceilings, so wiring is kept out of harm’s
way.
Conduit fittings are connectors and fittings used to
connect one piece of conduit to another or to connect
conduit to an electrical box.
A circuit breaker is an automatically operated electrical switch
designed to protect an electrical circuit from damage caused by excess
current from an overload or short circuit.
7/19/2020 https://www.menards.com/main/electrical/circuit-protection-distribution/
the electrical box has to be attached outside the home, regulation
was imposed by the fire department, so they can quickly shut off all
the electricity to the house in case of fire.
7/19/2020 https://www.menards.com/main/electrical/circuit-protection-distribution/
Service Entrance wire minimum of 8.00mm2 size of
copper wire, color-coded with the protective ground is green
or green with a yellow stripe. The neutral is white, the hot
(live or active) single-phase wires are black, and red in the
case of a second hot wire.
6/12/2020 https://www.thespruce.com/
5
Meter Offset - use to connect between metallic conduit and electric meter
6/15/2020 https://www.thespruce.com
Electric Meter box/base installation (pole)
Figure 7 shows how a meter box is installed. The metallic box/base has to be
weatherproof if installed outdoors on a metallic pole. The meter box can't be less
than 4 feet high or not higher than 6 feet high from floor level. A conduit is
connected to the meter box(2) using an adapter/locknut
indicated by number 1(service entrance). Insulator of
neutral wire with standard color is removed and screwed
at the middle of the meter box indicated by number
9(metering ground). Likewise, a breaker box(3) is
grounded all the way to ground rod(5). A circuit
breaker(6) is installed with an amperage based on the
requirement. Another conduit is connected right after the
breaker box(4) as service lateral to the main panel. All
metallic meter boxes must be grounded. Energy
meter(7) installation is actually done by service provider
field electricians, simply by plugging-in the specific
prongs(8) to the socket of the meter box.
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Figure 7
What’s More
More on metering installation
Watch a video clip on connecting meter base to the breaker box.
https://www.youtube.com/watch?v=_yxOG6GUWVA
6
What I Have Learned
Answer in a separate sheet of paper or activity notebook.
1. All metallic meter boxes must be
to prevent fault current.
2. The metallic box has to be weather-proof if installed
3. Meter box may be installed not less than
or higher than
.
.
What can I do
Activity : Examine your electric meter and illustrate how it is connected, in your
drawing/activity notebook.
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7
Self-check
Write your answer in separate sheet of paper
I- Matching Type:Match column A with column B: write in separate sheet
A
a.
b.
c.
d.
e.
f.
g.
h.
i.
j.
II-
B
Service lateral
breaker box
ground rod
service entrance
electric meter
meter base
prongs
circuit breaker
meter ground
service cap
Multiple choice: choose the letter of the
correct answer
1. Which is the symbol of the standard unit of electricity supplied to the consumer,
which is equal to 1 kilowatt acting for 1 hour?
a) kWh
b) mAh
c) Mbp
d) Hz
2. Meter box may be installed not less
in height.
A. 4 ft
B. 5 ft
C. 6 ft
D. 7 ft
3. Santos family has a record of 09877 for the previous electric bill, and the current
billing reads 09897 for the consumption in one month. Which is the total electric
consumption of the family?
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a)
b)
c)
d)
4.
a)
b)
c)
d)
1.
a)
b)
c)
d)
18 kWh
19 kWh
20 kWh
21 kWh
What does electric meter measures?
Amount of resistance
Amount of energy consumption
Amount of Power
Amount of Voltage
How many dial/s are there in an analog electric meter?
5
6
7
8
8
Additional Activities
Meter base and breaker box installation
Electrical meter boxes can be installed outdoors or indoors. The PEC, or Philippine
Electrical Code, specifies that any electrical installation must comply with the
residential code of the country where the installation is taking place. All metallic
meter boxes must be grounded[12].
1. Determine the location for the electrical meter box, as well as the height of the
box. The metallic box has to be weatherproof if installed outdoors on a
metallic pole. The meter box can’t be less than 4 feet high or higher than 6
feet high from floor level. The recommended height of the meter box is 5 feet.
2. Open a knock out on top of the meter box to fit the riser pole width. Insert the
meter box into the riser pipe, then secure it with a connector and a locknut of
the same size as the pipe used. There are four screws on each of the box’s
corners, which is used in securing the box to the wall or metallic post.
https://www.youtube.com/watch?v=8m5CVTRmxVA
3. Open another knock out at the bottom of the meter box. This will carry the wires
going to the service panel or breaker box for outdoor installation. Secure the pipe
with a connector and a lock nut that fits the pipe. Now the electrical meter box
installation is complete. Cover the box and request inspection from the local utility
company(i.e. BUSECO).
Assessment Criteria
WORKMANSHIP
https://www.youtube.com/watch?v=F7HGvRvR-Hs
Your score
5 pts.
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ACCURACY OF TESTING
USE OF TOOLS AND
INSTRUMENTS
USE OF PPE
SPEED
HOUSEKEEPING
TOTAL
4 pts.
3 pts.
3 pts.
3 pts.
2 pts.
20 pts.
9
Lesson
Electrical Grounding
2
What I Need to Know
In this lesson, you will learn about the grounding system, installation procedure, and
its importance in the electrical system.
OBJECTIVES
At the end of the lesson, you should be able to:
1.
2.
3.
Install the grounding system.
Choose appropriate materials needed for grounding connections.
Observe safety while working with an electrical job.
What I Know
Answer the questions below in a separate sheet of paper or in your
activity notebook.
1. The symbols below are used for grounding, which one is suited in household wiring?
2. What is the standard length of a grounding rod?
A. 0.5 m
B. 1.2 m
C. 3 m
D. 5 m
3. How far should the grounding rod be installed from the building?
A. 0.5 ft
B. 2 ft
C. 3 ft
D. no specific distance
4. Ideally, how deep should the rod be hammered into the ground?
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A. 1 foot
B. 2.4 ft
C. 3 ft
5. The electrical system is grounded to protect
A. Electrical equipment
B. Humans
C. Both Electrical Equipment and Humans
D. Neither Electrical Equipment nor Humans
D. 8 ft
from faults.
10
What’s In
In your past lessons, you have learned basic meter installation
How far should the meter base install above the ground level?
.
Accordingly, the meter box may be installed not less than 4 feet
and not exceeding 6 feet above the ground level.
What’s New
Let’s talk about electrical grounding
Activity: What part of figure A (labeled 1 through 9) is represented by figure B?
Figure B is an actual picture of electrical
grounding, represented by number 5 in
figure A.
A
B
11
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What Is It
Ground, in electricity, a connection in an electrical circuit that
leads to the earth, or to a large conducting object that is at zero potential
concerning the rest of the circuit (Microsoft ® Encarta ® 2009).
Importance of Electrical Grounding
In an electrical circuit, there is what's known as an active wire, which supplies the
power, and a neutral wire, which carries that current back. An additional 'grounding
wire' can be attached to outlets and other electrical devices and also securely
connected to the ground at the breaker box. This ground wire is an additional path
for electrical current to return safely to the ground without danger to anyone in the
event of a short circuit. If a short circuit did occur, the current would flow through the
ground wire, causing a blown fuse or tripped circuit breaker – an outcome much
more preferable than the fatal shock that could result if the current was not
grounded[8].
1. Protection against electrical overload
One of the most important reasons for grounding electrical currents is that it
protects your appliances, your home and everyone
in it from surges in electricity. If lightning was to
strike or the power was to surge at your place for
whatever reason, this produces dangerously high
voltages of electricity in your system. If your
electrical system is grounded, all of that excess
electricity will go into the earth rather than frying
everything connected to your system.
Microsoft encarta 2009
2. Helps direct electricity
Having your electrical system grounded means you will be making it
easy for power to be directed straight to wherever you need it,
allowing electrical currents to safely and efficiently travel throughout
your electrical system.
3. Stabilizes voltage levels
A grounded electrical system also makes it easier for the right amount of power to be
distributed to all the right places, which can play a huge role in helping to ensure
circuits aren’t overloaded and blown. The earth provides a common reference point
for the many voltage sources in an electrical system.
12
4. Earth is the best conductor
One of the reasons why grounding helps to keep you safe is because the earth is
such a great conductor, and because excess electricity will always take the path of
least resistance. By grounding your electrical system, you are giving it somewhere to
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go other than into you possibly saving your life. Earth resistance is greatly affected
by soil moisture content as it gets lower as displayed in an instrument.
The real Earth (the planet you are probably standing on) is electrically neutral. This
means that it has the same number of electrons and protons, so their charges cancel
out overall. Scientifically, we describe this by saying that the Earth has an Electric
Potential of zero[10].
5. Prevents damage, injury and death
Without a properly grounded electrical system, you are risking any appliances you
have connected to your system being fried beyond repair. In the worst-case
scenario, an overload of power can even cause a fire to start, risking not just
extensive property and data loss but physical injury as well.
Types of Grounding
Grounding in the household electrical system is the same with transmission and
distribution lines, thus understanding its type is a must.
1. Ungrounded. Electrical power systems that are operated with no intentional
connection to an earth ground are described as ungrounded. Although these
systems were standard in the '40s and '50s, they're still in use today. The main
advantage of this type of grounding system is that it offers a low value of current flow
and reliability during a fault. The occurrence of a second fault will more likely be
decrease than the grounded system fault[9].
2. Solidly grounded. This type of grounding system is most commonly used in
industrial and commercial power systems, where grounding conductors are
connected to earth ground with no intentional added impedance in the circuit. A main
secondary circuit breaker is a vital component required in this system, although it
has no bearing in other grounding systems. The neutral of any grounded system will
permit the flow of current through the conductor when the unbalanced load is
connected[9].
3. High-resistance grounding. High-resistance grounding (HRG) systems are
commonly used in plants and mills where continued operation of processes is
paramount in the event of a fault. High-resistance grounding is normally
accomplished by connecting the high side of a single-phase distribution transformer
between the system neutral and ground.
13
https://www.eaton.com/Eaton/ 7/19/2020
How does Grounding Work?
In most homes, the wiring system is permanently grounded to a metal rod driven
into the ground or a metal pipe extending into the house from an underground water-
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supply system. A copper conductor connects the pipe or rod to a set of terminals for
ground connections in the service panel. For wiring systems that use electrical cable
covered in metal, the metal usually serves as the ground conductor between wall
outlets and the service panel.
In wiring systems that use plastic-sheathed cable, an extra wire is used for
grounding. Since electricity is always looking for the shortest path back to the earth,
if there is a problem where the neutral wire is broken or interrupted, the grounding
wire provides a direct path to the ground. Through this direct physical connection,
the earth acts as a path of least resistance, preventing a person from becoming the
shortest path, and suffering a serious electric shock.
Electrical Grounding Materials
Ground Rods- can be made with many different materials but the most
common is galvanized.
Grounding Terminal-accepts wire with a range of sizes.
Grounding Installation Procedure (wikihow.com)
1. Picking the location-install the rod in a location near
the electrical panel where they can be hammered into
the ground around 2 meters deep. No requirement for
how close or how far from the building as long as it is
convenient to use tools in driving bolt.
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2. If the ground rod is long, you can dig a hole and
burry. It can be hard to get leverage on the top of it.
You can also use a ladder or steep tool to get up high
in the top of the ground rod.
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Gradually drive the rod into the ground using a
hammer or driving tool in a vertical position.
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3. Connecting the rod: pull the grounding electrode conductor to the ground rod not
etremely tight and remove in insulator using an
electrician’s knife/wire stripper or any appropriate tool.
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4. Clamp the grounding electrode conductor to the ground rod. Put the end of the
conductor inside the clamp and turn the screw as shown to press them securely.
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5. Connect the grounding electrode conductor to the
ground bus. The ground bus is where all the ground
and neutral wires are attached in the electrical panel.
To make the connection, slide the end of the
grounding electrode conductor through one of the
holes in the bus and tighten.
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IS YOUR ELECTRICAL SYSTEM GROUNDED?
You can usually tell whether your electrical system is
grounded by checking your power outlets. If they
accept plugs with three prongs, your system should
have three wires, one of which is a grounding wire.
Similarly, an appliance designed to be grounded is equipped
with a three-wire cord and a three-pronged plug. The third wire
and prong provide the ground link between the metal frame of
the appliance and the grounding of the wiring system..
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https://www.platinumelectricians.com.au/blog/importance-grounding-electrical-currents/
When dealing with appliances, make sure you:
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Do not touch an appliance if its cord’s insulation has begun to wear away where it
enters the metal frame. In this situation, contact between the metal current conductor
and the metal frame could make the whole appliance live with electricity, and
touching the appliance could cause the current to surge through you. Inspect,
maintain, and organise repairs of wires where they enter a metal pipe, an appliance,
or where in-wall cables enter an electrical box. The best thing you can do to create a
safe electrical system is to ensure the whole system is grounded and the ground
circuit is electrically continuous.
Grounding your electrical system is a smart and easy way to make it a whole lot
safer, as well as to protect against the very real possibility of having to deal with
fluctuations in power supply. If you want to safeguard all of your important assets,
whether at home or at the office, as well as look out for the health and safety of
everyone around you, find out if your electrical system is grounded[8].
What’s More
More on Grounding
https://www.youtube.com/watch?v=TycWNfpgfH0
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What I Have Learned
Answer in a separate sheet of paper or activity notebook.
1. Moisture content in the soil
the earth soil resistance.
A. Increase
B. Decrease
C. Does not affect
2. In an ungrounded system the occurrence of second fault will more likely be
than grounded system fault.
More Severe
Less Severe
3. The neutral of any grounded system will permit the flow of current through the conductor
when unbalanced load is connected.
True
False
4. Our earth is a negatively charged body.
True
False
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5. In order to achieve Continuity of the operation even during fault condition which
type of the configuration is preferred.
Grounded System
Ungrounded system
What can I do
Activity : Examine your meter/panel connection and illustrate how it is grounded. In
your drawing/activity notebook.
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Lesson 2: Self-check
Write your answer in separate sheet of paper
I- Multiple choice: choose the letter of the correct answer
1. Electrical system is grounded in order to protect
from faults
A. Electrical equipment
B.
Humans
C.
Both Electrical Equipment and Humans
D.
Neither Electrical Equipment nor Humans
2. Which of the following system produces highest ground fault current when a fault to
ground occurs:
A. Solid grounding system
B. Ungrounded sytem
C. Resistance grounding system
D. Reactance grounding system
3. High Resistance grounding typically limits ground fault current under to
:
A. 25A
B. 100A
C. 50A
D. 500A
4. Which of the following type of grounding system has the highest probability for
escalation of ground fault to phase to phase and three phase arcing fault,
particularly for low voltage system:
A. Solid grounding
B. Resistance grounding
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C. Reactance grounding
D. All the options are correct
5. In which of the following system, identification of fault is tedious:
A. Resistance grounding
B. Solid grounding
C. Reactance grounding
D. Ungrounding
6. The ungrounded system, in reality is a
grounding system:
A. Capacitance
B. Inductance
C. Resistance
D. Combination of Inductance and Resistance
7. The objective of grounding or earthing is
A. to provide as low resistance possible to the ground
B. to provide as high resistance possible to the ground
C. to provide flow of positive, negative and zero sequence currents
D. none of the above
8. The size of the easth or ground wire is based on the
A.
maximum fault current carrying through the ground wire
B.
rated current carrying capacity of the service line
C.
depends on the soil resistance
D.
both (A) and (C)
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Additional Activities
Activity 1: Write two main reasons why grounding is necessary.
1.
2.
Activity 2: Assemble a miniature breaker box and panel grounding. Use recycled
material.
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Assessment Criteria
WORKMANSHIP
ACCURACY OF
CONNECTION
USE OF MATERIALS
SPEED (SUBMISSION)
TOTAL
Your score
5 pts.
5 pts.
5 pts.
5 pts.
20 pts.
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Post-Test:
DIRECTION: Answer in a separate sheet of paper or activity notebook.
I- MULTIPLE CHOICE: choose the letter of the correct answer
1.
Electrical system is grounded to protect
from faults
A. Electrical equipment
B. Humans
C. Both Electrical Equipment and Humans
D. Neither Electrical Equipment nor Humans
2.
Which is the symbol of the standard unit of electricity supplied to the consumer,
which is equal to 1 kilowatt acting for 1 hour?
A. kWh
B. mAh
C. Mbp
D. Hz
3.
What does electric meter measures?
A. Amount of resistance
B. Amount of energy consumption
C. Amount of Power
D. Amount of Voltage
4.
Santos family has a record of 09877 for the previous electric bill, and the current
billing reads 09897 for the consumption in one month. Which is the total electric
consumption of the family?
A. 18 kWh
B. 19 kWh
C. 20 kWh
D. 21 kWh
5.
How many dial/s are there in an analog electric meter?
A. 5
B. 6
C. 7
D. 8
6.
Meter box may be installed not more than
in height.
A. 4 ft
B. 5 ft
C. 6 ft
D. 7 ft
7.
How long is the grounding rod?
A. Less than .5 m
B. 1.2 m to 2.5 m C. 3.5 m
D. more than 3.5 m
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8.
High Resistance grounding typically limits ground fault current under to
A. 25A
B. 100A
C. 50A
D. 500A
9.
:
In which of the following system, identification of fault is tedious:
A. Resistance grounding
B. Solid grounding
C. Reactance grounding
D. Ungrounding
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10. The size of the easth or ground wire is based on the
A.
maximum fault current carrying through the ground wire
B.
rated current carrying capacity of the service line
C.
depends on the soil resistance
D.
both (A) and (C)
II-Identification: Identify the labeled parts, choose your answer from the word box
A. Metering Connection
Meter ground, Ground rod, meter prongs, service lateral, meter base, breaker box,
service entrance, circuit breaker, meter
1.
2.
3.
4.
5.
6.
7.
8.
9.
III- TRUE OR FALSE: Write T if the statement is correct, F if the statement is wrong.
1. Moisture content in the soil increases the earth soil resistance.
2. In an ungrounded system the occurrence of second fault will more likely be
more severe than grounded system fault.
3. The neutral of any grounded system will permit the flow of current through the
conductor when unbalanced load is connected.
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4. Our earth is a negatively charged body.
5. In order to achieve Continuity of the operation even during fault condition
ungrounded system type of the configuration is preferred.
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Key to Answers
23
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References
1- https://www.electricaltechnology.org/2015/02/gfci-ground-fault-circuit-interrupter-
types-working.html :(6/13/2020)
2- https://safeelectricity.org/ground-fault-circuit-interrupters-gfcis/ : (6/12/2020)
3-wikiHow-install grounding: (6/12/2020)
4-https://callmepower.com/useful-information/electricity-meter :(6/13/2020)
5-https://www.zoro.com/conduit-clamps-hangers/c/4873/ : (6/12/2020)
6- https://www.myphilippinelife.com : (6/10/2020)
7- https://www.waterheatertimer.org/How to install electric meter/ : (6/13/2020)
8- https://www.platinumelectricians.com.au/blog/importance-grounding-electrical-
currents/: (6/26/2020)
9- https://www.ecmweb.com/content/article/20890415/the-basics-of-grounding-
systems
10- https://www.examveda.com/electrical-engineering/practice-mcq-question-on-
earthing-or-grounding/?page=3
11- https://www.duquesnelight.com/working-with-us/construction-and-
renovation/meter-installation-process :(6/13/2020)
12- https://www.hunker.com/12453733/how-to-install-an-electric-meter-box
(6/13/2020)
13- https://electricityandgas.com.au/guide/electricity-meter/#Electricity_Flat-
rate_Meter
Google.com : (6/12/2020)
14_https://commons.wikimedia.org/wiki/ 7/19/2020
https://www.powerfromsunlight.com/types-electricity-meters-used-solar-panel-system/ 7/19/2020
https://electricityandgas.com.au/guide/electricity-meter/
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