Industrial Electrical Blueprint Reading

Course Number: 710

This course focuses on principles that can be applied in many kinds of circumstances to ensure the personal safety of oneself and others. Lesson Two covers the requirements of OSHA and other government agencies. The course then provides a thorough explanation of how blueprints are structured and the conventions that are used in making them and reading them. These principles are then applied to electrical drawings. After introducing the concepts of what symbols mean and how they are used in conveying technical information, this course shows how the general principles are applied for specific purposes. The following lessons then focus on how to read and troubleshoot with electrical diagrams.

Recommended Contact Hours - 16

Chapter 1: Introduction to Safety

Topics: Responsibility for safety; Your company’s safety program; Unsafe acts and unsafe conditions; Recognizing hazards; Health hazards; Types of accidents; Accident investigation; Handling emergencies; Safety off the job

Learning Objectives:

• Define the terms accident and hazard.
• Name and define the four main types of hazards.
• List and define various types of accidents.
• Compare meanings of the terms unsafe act and unsafe condition.
• Name the three ways in which a toxic substance can enter your body.
• List ways in which a company must plan for emergencies.
• Tell the main reason for prompt accident investigation.

Chapter 2: Safety Laws

Topics: Occupational safety and health administration; The rights of employees and employers; OSHA standards; Inspections by OSHA; Taking immediate action; Records and reports; OSHA and your job; OSHA’s hazard communication standard; Sections of the MSDS; NIOSH; EPA and OSHA

Learning Objectives:

• State the purpose of the OSHA Act.
• List the specific rights of employees under the Act.
• Explain what to do in a dangerous work situation.
• List things that you can do to help keep your workplace in compliance with OSHA standards.
• Explain the function of each of the following agencies: NIOSH, EPA.
• List the four main objectives of OSHA’s Hazard Communication Standard.
• Tell what information can be found on an MSDS.

Chapter 3: Electrical Safety

Topics: Electricity; The electric circuit; Injuries from electricity; First aid for shock victims; National electrical code; Static electricity

Learning Objectives:

• Define the following terms: electric current, circuit, potential difference, ampere, watt, ohm, and volt.
• State Ohm’s Law.
• Explain the function of each wire in a simple electric circuit and tell the color(s) used to identify each.
• List the three factors that affect the severity of an electric shock.
• Describe the effects of electric current on the human body.
• Tell the three most important points about first aid for shock victims.
• Explain how static electricity is generated, why its accumulation can be dangerous, and how it can be avoided.

Chapter 4: Electrical Protection

Topics: Grounding; Protection against ground faults; Fuses and circuit breakers; Circuit breaker reset and fuse replacement; Portable power tools; Hazardous electrical locations; Basic rules of electrical safety

Learning Objectives:

• Explain the importance of proper grounding.
• Define the term “ground fault” and explain how ground faults occur.
• Explain the purpose and operation of the following devices: GFCI, fuse, circuit breaker.
• Identify typical hazardous electrical locations.
• Explain the purpose of explosion-proof and intrinsically safe electrical equipment.
• List at least two electrical safety rules in each of the following areas: clothing, equipment, water, lockout/tagout.

Chapter 5: Introduction to Blueprints

Topics: Importance of blueprints; Purpose of blueprints; Types of information on blueprints; Supplementary spaces; Detail drawings; Interpreting a detail drawing; Assembly drawings; Orthographic projections; Auxiliary views; Sections; Pictorial drawings

Learning Objectives:

• Identify details, markings, and machine parts from an assembly drawing.
• Identify an object from an orthographic drawing.
• Identify elements located within the title block of a detail drawing.
• Explain why more than one orthographic projection is needed to show an object on a blueprint.

Chapter 6: Electrical Drawings

Topics: Importance of electrical drawings; Electric power; Controlling electricity; Electrical drawings; Electrical wiring; Using electrical drawings

Learning Objectives:

• Identify different electrical symbols on a drawing.
• Identify the power distribution panels in your plant.
• Identify different types of conduit and cable.
• Select the best electrical drawing to use when looking for a faulty circuit between the basement and the first floor.
• Select the best electrical drawing to use when looking for a faulty circuit between the basement and the first floor.
• Explain how electricity at 480 V is reduced by a transformer to 120/240 V.
• Define the terms voltage, current, and power.

Chapter 7: Introduction to Technical Diagrams

Topics: Symbols in schematics; Using schematics; Electrical schematics; Pneumatic and hydraulic schematics; Piping schematics; Value of schematics; Looking for flow; Electric current; Fluid flow

Learning Objectives:

• State the definition of a schematic.
• List some characteristics of schematics.
• Identify a schematic among other kinds of technical drawings and diagrams.
• Explain how flow is indicated on a schematic.

Chapter 8: Symbols on Schematics

Topics: Common features of schematics; Differences in schematics; Using the schematic; Understanding symbols; Identifying symbols; Identifying connections; Reading diagrams

Learning Objectives:

• Identify various types of lines on schematics.
• Identify the following schematics by their symbols: electrical, fluid-power, and piping.
• Give the purpose of legends and other tables of symbols
• Describe a set-by-step approach to troubleshooting when using a schematic.

Chapter 9: Electrical Symbols

Topics: Wires and connections; Switches; Power supply; Electrical loads; Coils and transformers; Fuses and circuit breakers; Grounding; Contacts; Resistors; Symbols in a diagram

Learning Objectives:

• State the meaning of symbols and lines on an electrical schematic.
• Explain the difference between a fuse and a circuit breaker.
• Explain how to trace an electrical circuit.

Chapter 10: Electrical Diagrams

Topics: Kinds of electrical drawings; Schematic diagrams; Series and parallel circuits; Wiring diagrams; Reading electrical diagrams; Reading industrial schematics; Practice exercises

Learning Objectives:

• Explain the difference in current flow between a series circuit and a parallel circuit.
• Explain the purpose of a wiring diagram.
• Demonstrate how to read an electrical schematic.
• Identify the objects represented by the symbols on an industrial schematic.

Chapter 11: Troubleshooting with Electrical Schematics

Topics: Standard symbols and diagram identification; Elementary diagrams; Reading the schematic diagram; Power circuit; Control circuit; Motor-starting circuit; Identifying conductors; Numbering components; Locating relay contacts; Control-panel layouts; Sequence of operation; Related schematic information

Learning Objectives:

• Identify a control relay on an electrical schematic.
• State the NEC requirements for fuses in ungrounded conductors.
• Explain component numbering on electrical schematics.