Electrical Safety and Protection

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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