Electrical Systems > Electrical Safety and Protection

Electrical Safety and Protection

Course Number: 725.2

The Electrical Safety and Protection textbook examines electrical hazards and stresses the importance of electrical safety. Covers the equipment and procedures necessary to work safely with electricity, including PPE, lockout/tagout, and first aid. Explains the importance of grounding. Describes many kinds of fuses, circuit breakers, and motor protection devices and their uses.

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Recommended Contact Hours – 11

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Table of Contents

Chapter 1: Electrical Hazards

Topics: Electrical safety, shock, arc; Hazardous electrical locations

Learning Objectives:

  • List the three main factors that determine the effect of electric current on the human body.
  • Explain what to do if a person is a victim of electric shock.
  • Name four precautions you can take to guard against electric shock.
  • Define the term qualified person.
  • Summarize the basic rules of electrical safety.

Chapter 2: Electrical Safety Equipment

Topics: Work clothes; PPE; Foot, head, eye, and face protection; Gloves; Respiratory protection; Lockout devices; Voltage testers

Learning Objectives:

  • Describe appropriate clothing and PPE to wear when working with electricity.
  • Explain first aid procedures for eyes.
  • Describe the devices used to lock out power.
  • Tell how to keep plant personnel out of an area where electrical work is being performed.
  • Explain the purpose of a voltage tester.

Chapter 3: Electrical Safety Procedures

Topics: Energy control; Lockout/tagout procedures; Using power tools safely; Power tool safety rules; Recognizing electric shock victims; First aid for shock victims

Learning Objectives:

  • Explain the concepts of energy control and zero energy state.
  • Summarize the OSHA lockout procedure.
  • Explain how portable power tools are grounded.
  • List some common symptoms of electric shock.
  • Summarize the steps involved in administering CPR.

Chapter 4: The National Electric Code

Topics: Overview of the NEC; Chapter 1: General NEC; Chapter 2: Wiring and Protection; Chapter 3: Wiring Methods and Materials; Chapter 4: Equipment for General Use; Chapter 5: Special Occupancies; Chapter 6: Special Equipment; Chapter 7: Special Conditions; Chapter 8: Communications Systems; Chapter 9: Tables; Annexes

Learning Objectives:

  • Understand the purpose and scope of the National Electrical Code.
  • Define key terms related to the National Electrical Code.
  • Determine requirements for electrical installations.
  • Locate and reference common National Electrical Code articles.
  • Identify common calculation tables.

Chapter 5: Grounding, Ground Faults, and Short Circuits

Topics: Grounding, Ground Faults, and Short Circuits - Equipment, circuit, and transformer grounding; Effects of impedance; Grounded conductor alarms; Detecting faults automatically; Static electricity

Learning Objectives:

  • State the reason why circuits should be grounded.
  • Explain how to test a circuit for proper grounding.
  • Explain how a ground-fault circuit interrupter works.
  • Contrast current electricity and static electricity and explain why each can be hazardous.
  • Identify the correct extinguisher to use on flammable liquid fires and on energized electrical equipment fires.

Chapter 6: Fuses and Circuit Breakers

Topics: Purpose of a fuse; Lead-wire, cartridge, power, plug, and glass-tube fuses; Thermal-magnetic and low-voltage power circuit breakers; Circuit breaker tripping

Learning Objectives:

  • Explain how a dual-element cartridge fuse works.
  • List the NEC rules on installing fuses.
  • Explain how a circuit breaker works.
  • Describe molded-case circuit breakers.
  • Explain the steps involved in fuse replacement and/or circuit breaker reset.

Chapter 7: Motor Protection

Topics: Feeder size; Branch circuits; Motor-running overcurrent protection; Inherent thermal protection; Temperature-sensing devices; Melting-alloy and bimetallic relays; Selecting motor protection; Single phasing; Overload relays

Learning Objectives:

  • List the steps in determining the correct rating of the motor feeder protection.
  • Explain how to select a thermal overload relay.
  • Explain how thermostatic, resistance, and thermocouple detectors work.
  • Contrast temperature-sensing devices and current-sensing devices.
  • Explain how various relays provide motor protection.
  • Define single phasing.

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Select Chapter(s):

  •    Chapter 1: Electrical Hazards
  •    Chapter 2: Electrical Safety Equipment
  •    Chapter 3: Electrical Safety Procedures
  •    Chapter 4: The National Electric Code
  •    Chapter 5: Grounding, Ground Faults, and Short Circuits
  •    Chapter 6: Fuses and Circuit Breakers
  •    Chapter 7: Motor Protection

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