GRADE 12- ELECTRICAL INSTALLATION AND MAINTENANCE
Name: ______________________________________
Date: ____________________
Grade: ______________________________________
Section: ___________________
Semester: 1st Week: 1 SSLM No. 1
ELC(s): Select the wiring devices used for
floor and ground fault current interrupter
Objectives:
●
●
Familiarize the different types of electrical diagrams;
Draw electrical symbols and signs according to job specifications for residential
electrical plan; and
● Interpret residential electrical plan
⮚ Topic: Interpret electrical plans and
drawings for the selection of wiring devices based on job requirements.
Let Us Discover
Common Electrical Symbols
Electrical Symbols are small drawings or pictograms used to represent various
electrical devices in a diagram or plan of an electrical circuit. These symbols are used in
sketching schematic diagrams and electrical plans for numerous types of electrical works.
Practically, any electrical fixture found in a house has a symbol that coincides with said fixture
on an electrical wiring diagram. These are very useful guides for an electrician or electrical
contractor, thus, making the wiring easier to install as well. The following are common
electrical symbols used in sketching wiring plans and diagrams.
Electrical Wiring Diagram
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The flow of current in a conductor or wire can be represented by a diagram.
There are two types of diagram: pictorial diagram and schematic diagram.
Pictorial diagram is a sketch of
electrical circuit that shows an external
appearance of each component. It is
much like a photograph of the circuit
and uses simple images of parts.
Schematic diagram is a sketch
showing the components of the circuit
using standard electrical symbols. It
shows
the
actual
number
of
components and how the wiring is
routed but not the actual location.
Circuit wiring diagram is the
presentation
of
interconnections
between circuit components in the
schematic diagram which does not
necessarily correspond to the physical
arrangements in the finished device.
Block diagram is a diagram of a
system in which the principal parts or
functions are represented by blocks
connected by lines that show the
relationships of the blocks
Electrical Plan
Electrical plan is a graphical presentation of electrical wiring connections to install in
a particular house or building. It indicates the position of electrical fixtures such as
convenience outlets, switches, lightings, door bells, and others to be installed.
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Let Us Try
Directions: Try to look at the diagrams below and the answers are jumbled next to it. Figure
out what word it is and write it on the blank line provided.
1.
_______________ O C B L K
2.
DIAAMGR
_______________EMASCHTIC A G D I R A M
3.
________________ L O C B K
RAM DIGA
4.
________________ R C U C I I T D G R A I A M
5.
________________TURIPICAL
IADGRAM
Let Us Do
Directions: Draw the symbols of the corresponding electrical descriptions.
1. Floor outlet
2. Duplex convenience outlet
3. Incandescent lamp
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4. Fluorescent lamp
5. Male plug
6. Single pole switch
7. Connected wires
8. Circuit breaker
Let Us Apply
Directions: Interpret the given circuit problem by drawing using the type of diagram
requirements on the box provided.
Circuit Problem: TWO BULBS CONNECTED IN PARALLEL CONTROLLED INTO
TWO LOCATIONS SWITCHES.
1. Schematic diagram
2. Pictorial diagram
3. Block diagram
4
4. Circuit diagram
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Rubrics
Rubric for “Let Us Apply” activity:
Criteria: Complete information 10- all information needed are stated, 7- one
information is lacking, 5- more than 1 information is lacking
40
ACCURACY OF
ALL ELEMENTS
20
NEATNESS
20
20
20
PROMPTNES
S OF
SUBMISSION
Submitted on
scheduled
Time of
retrieval
40
Correct diagrams,
Correct Squaring of
Connections,
Correct Symbols
20
30
Correct Diagrams,
Correct Squaring of
Connections,
Wrong Symbols
10
20
Correct Diagrams,
Wrong Squaring of
Connection,
Wrong Symbols
5
10
Wrong Diagrams
Wrong Squaring of
Connection
Wrong Symbols,
3
No Erasures,
No Markings,
Paper is not
crumpled,
Used ball pen in
wiring diagrams w/
diff. colors
No Erasures,
Paper is not
crumpled,
There are markings
using ballpen
but not in different
colors
There are erasures,
Paper is not
crumpled
There are markings
using pencil
There are many
erasers,
Paper is crumpled,
Pencil is used for
markings.
Accuracy of
Figures
20
All lines and
curves are
accurate
15
1 day late
15
Lines are
accurate but
curves and
circles are not
perfect
10
2 days late
10
There is a slight
inaccuracy in
lines and in
figures.
5
3 or more days
late
5
All the lines and
diagrams are
inaccurate.
References
TVL Self Learning Module Electrical Installation and Maintenance Grade 12.
Interpret electrical plans and drawings for the selection of wiring devices based on
job requirements. Alaman, E. A. et.al. pp.7-19
SSLM Development Team
Writer: Arbaya A. Lampatan
Content Editor: Emran A. Alaman Jr., RME
LR Evaluator: Emran A. Alaman Jr., RME
Illustrator: Emran A. Alaman Jr.,RME
Creative Arts Designer: Reggie D. Galindez
Education Program Supervisor: Amalia C. Caballes
Education Program Supervisor – Learning Resources: Sally A. Palomo
Curriculum Implementation Division Chief: Juliet F. Lastimosa
Asst. Schools Division Superintendent: Carlos G. Susarno, Ph. D.
Schools Division Superintendent: Romelito G. Flores, CESO V
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