📝 Learning Competencies: Explain Signs and Symbols for Electrical Services
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🎯Objectives
At the end of the lesson, you should able to:
Identify and explain common signs and symbols used in electrical services, including their meanings and functions.
Interpret and use electrical service signs and symbols when reading diagrams, manuals, or equipment labels.
Demonstrate awareness and appreciation of the importance of correctly understanding electrical signs and symbols to promote safety.
✏️ PRE-TEST
Instruction: Read each question carefully and select the one best answer for all 10 multiple-choice questions in the Google Form before submitting.
📑 Lesson 1: Working Drawings, Signs and Symbols in Electrical Services
📑 Lesson 1.1 Electrical Symbols
What is Electrical Symbols?
What is Electrical Symbols?
Electrical symbols are used to simplify the drafting and to understand the drawing.
In order to achieve the ability to interpret the drawings and and their related symbol meanings, we must learn the basic form of various symbols.
ELECTRICAL SYMBOLS FOR WIRE
Wire
Wire
Conducts electricity
Connected Wires
Connected Wires
Wires are connected
Not Connected Wires
Not Connected Wires
Wires are not connected
ELECTRICAL SYMBOLS FOR GROUND
Earth Ground
Earth Ground
A direct, physical connection to the soil.
Chassis Ground
Chassis Ground
A connection to the metal frame or outer enclosure of a device.
Common Ground
Common Ground
A shared reference point for all signals in a low-voltage electronic circuit.
POWER SUPPLY SYMBOLS
Voltage Source
Constant Voltage Source
Current Source
Constant Current Source
AC Voltage Source
Source of AC Voltage
Battery
Constant Voltage Source
Battery Cell
Constant Voltage Source
Generator
Mechanical Voltage Source
LIGHT AND LAMP BULB SYMBOLS
SWITCH AND RELAY SYMBOLS
SPST Toggle Switch
Disconnect Current when Open
SPDT Toggle Switch
Select between two connections
Push Button Switch NO
Switch Momentary, Generally Open
Push Button Switch NC
Switch Momentary, Generally Closed
DIP Switch
Onboard Configuration
SPST Relay
Single Pole Single Throw
SPDT Relay
Single Pole Double Throw
Jumper
Jumper to close connection
Solder Bridge
Solder Connection
OTHER IMPORTANT ELECTRICAL WIRING SYMBOLS
📝 Activity 1: Guess What?
Instruction: Choose the correct electrical symbols. Don't forget to screenshot or take a photo of your assessment results. Goodluck and enjoy!
📑 Lesson 1.2: Electrical Signs
1.2 What is Electrical Signs?
1.2 What is Electrical Signs?
These are stylized with bold backgrounds and electrical safety signs to warn people that serious injuries can occur from burn, electric shocks, and hazards.
It can also be found around workplaces - particularly construction sites, factories, and farms where the use of high voltage electrical equipment or cables is common.
What is Hazard?
A hazard is anything that can cause harm, injury, or damage to people, property, or the environment.
TRY THIS! SPOT THE HAZARD 🔎
Instruction: Click the link below to proceed with the activity game HUNTING THE HAZARD.
COMMON ELECTRICAL SAFETY SYMBOLS
CAUTION
indicates some precautionary measures against potential hazardous situation which, if not avoided, may result to a minor or moderate injury.
SAFETY ALERT
indicates that a person should observe extra awareness.
PROHIBITION
means that any activity is not allowed as stated by the symbol.
DANGER
specifies hazardous situation which, if not avoided, will result to a serious injury or even death.
WARNING
specifies a potentially hazardous situation which, if not avoided, could result to serios injury or even death.
READ AND UNDERSTAND INSTRUCTION MANUALS
means that a person should make some reading before doing any activity.
WEAR EYE PROTECTION
indicates that a person should wear safety goggles or any related protection for the eyes.
📑Activity 2: MATCH AND PAIRS!
Instruction: Drag and drop each keyword next to its correct definition. Do not forget to take a screenshot of your scores.
📽️ Watch the video below to learn more about different safety signs found in a work place.
✏️ POST TEST
Instruction: Read each question carefully and select the one best answer for all 10 multiple-choice questions in the Google Form before submitting.
✏️ WHAT I HAVE LEARNED?
Instruction: On a separate sheet of paper, answer the following questions. Your answers will be evaluated using the scoring rubrics.
What can happen if someone does not understand electrical signs and symbols correctly? (5 points)
How do electrical symbols help keep people safe when working with electricity? (5 points)
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