Troubleshooting and Repairing Commercial Electrical Equipment

by David Herres

Overview

A PRACTICAL GUIDE that shows maintenance and construction electricians how to successfully repair commercial and industrial electrical equipment

Troubleshooting and Repairing Commercial Electrical Equipment is the first work that offers a practical approach to diagnosing and repairing commercial/industrial electrical equipment – covering everything from motors, computers, elevators, and fire alarm systems to heavy-duty ovens and audio equipment. If you are a licensed construction or maintenance electrician who repairs malfunctioning industrial electrical equipment, this one-of-a-kind guide can help you become more competent in your profession.

Inside you'll find ways to become faster, more efficient, and able to achieve a much higher success rate in restoring large electrical equipment without damaging it, introducing an additional defect, or creating a hazard. This invaluable resource also includes information for those seeking licensing and certification, as well as different measures that should be taken to ensure that a UL or other agency listing is not voided.

• Presents a new system of diagnostics based on the difficulty of each procedure and the probability of its success
• Emphasizes a practical approach to ensure that equipment is fixed properly
• Uses a blend of basic electrical theory and sophisticated mathematical equations that both experienced technicians and apprentices can learn from
• Includes separate chapters on elevators, fire alarm systems, motors, largescale stereo equipment, and industrial appliances
• Discusses related licensing and certification as they pertain to troubleshooting and repair
• Written by a Master Electrician with more than 35 years of experience

Product Details

ISBN-13:	9780071810326
Publisher:	McGraw Hill LLC
Publication date:	07/13/2013
Sold by:	Barnes & Noble
Format:	eBook
Pages:	272
File size:	6 MB

About the Author

David Herres (Clarksville, NH) is the owner and operator of a residential and commercial construction company. He obtained a Journeyman Electrician’s License in 1975, and has certificates in welding and wetland delineation, along with experience with elevators. Beginning in 2001, Mr. Herres has focused primarily on electrical work, upgrading his license to Master status. The author of a 2006 article for Electrical, Construction, and Maintenance on complimentary wiring methods, he has written nearly 70 articles on electrical and telecom wiring. Herres is the author of 2 books for McGraw-Hill: The 2011 National Electrical Code: Chapter-by-Chapter (August, 2011), and Troubleshooting and Repairing Commercial Electrical Equipment, to be published in July, 2013.

Table of Contents

Preface ix

1 Troubleshooting Techniques 1

Entering the Field 3

Getting Started 5

Electronic Components 7

What's the Significance? 8

Frequency Is All-Important 12

Multiple Circuit Elements 15

Looking at Transformers 17

What Is an Autotransformer? 17

Inside a Diode 19

Testing a Diode 23

Transistors Have Multiple Uses 24

Using the Diode Check Function 27

What Is a MOSFET? 30

Varieties of Test Equipment 34

More Advanced Testing 38

More PCB Repair Techniques 38

An Essential Skill 41

2 Electric Motors 47

Easy Motor Repairs 47

Two Parts of All Motors 48

Slip in an Induction Motor 52

A Common Fault 55

Going Deeper 57

Other Motor Test Procedures 61

Additional Considerations 65

NEC and the Motor 67

The Relevance of Article 725 72

Types of Motor Controllers 75

3 Residential Wiring 77

Problem Solving 78

A Hazardous Situation 79

A Thought Experiment 84

Nuisance Tripping 87

An Easy Job 89

4 Commercial and Industrial Wiring 91

Using Type NM 91

Simple Conduit Bends 93

Identifying Wires 96

PLC Anatomy 97

5 Electrical Power Distribution Systems Including Transformers 101

Problem Solving 102

SCADA and Remote Monitoring 105

Wye and Delta 106

Code Navigation 107

Solar Difficulties 108

6 Telephone Systems 111

PBX and Multiplexing 112

Phone Diagnosis and Repair 114

Dead Phone Syndrome 115

Why Use Cat 5e? 116

7 Audio and Video Equipment 119

Optimum Sound 120

Audio Fundamentals 122

TV Repair Procedures 124

8 Computer Troubleshooting and Repair 127

BIOS Start-Up 128

Hardware versus Software 129

More Mac Subsystems 131

HTML Coding 133

Principle HTML Tags 134

9 Understanding Ethernet and Learning to Create a Simple Network 137

Ethernet Terminations 138

Mitigating Fire Hazards 140

Building Ethernet Cables 142

10 Satellite Dishes for Communication Systems 145

Waveguide Technology 145

What Is Characteristic Impedance? 149

Dish System Inner Workings 153

Troubleshooting Dish Systems 155

11 Elevators 157

Elevator Wiring Protection 158

Specialized Requirements 160

The Next Step 163

Fire Service Mode 165

12 Fire Alarm Systems 167

Fire Alarm System Fundamentals 169

Altered States 172

Sprinkler Varieties 174

Easy Remedies 176

Drastic Measures 179

13 Troubleshooting Refrigeration Equipment 181

Refrigerant Circuit 183

Refrigeration Repairs 184

Compressor Fault Modes 186

Back to NEC 189

14 Healthcare Facilities 191

Know Your Definitions 192

When You Need Redundant Grounding 194

How Many Receptacles? 195

Systems within Systems 198

15 Solar and Wind Power 203

Joining the Grid 205

Batteries (When Needed) 207

Mandatory Disconnects 211

When Output Declines 217

Big Machines 221

16 Oscilloscopes Revisited 223

Further Developments 224

Improved Scopes 225

Probes 227

Acquiring a Good Display 229

17 What Lies Ahead? 233

Probing the Universe 234

Leaving Earth 237

Coherent Light 239

Disorganized Light 240

Finding the Fault 245

Index 249