Electrician's Calculations Manual, Second Edition

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Electrician's Calculations Manual, Second Edition

Electrician's Calculations Manual, Second Edition

Authors: Nick Fowler

Published: August 2011

eISBN: 9780071770170 0071770178 | ISBN: 9780071770163

Contents

Preface

Electricity—An Overview

1 Direct Current Calculations

1-1 Ohm’s Law

1-2 Series Circuits

1-3 Parallel Circuits

1-4 Combination Circuits

Chapter 1 Test

2 Alternating Current Calculations

2-1 Single Phase

2-2 Three-Phase Power

2-3 Power Factor

2-4 Voltage Drop

2-5 Combining Loads, Single Phase and Three Phase

Chapter 2 Test

3 Transformers

3-1 Transformer Basics

3-2 Delta and Wye Characteristics

3-3 Delta Connection

3-4 Wye Connection

3-5 Grounded Delta

3-6 Open Delta

3-7 Motor Control Transformer

3-8 Series and Parallel Windings

3-9 Transformer Polarity

3-10 Buck and Boost Transformers

Chapter 3 Test

4 Miscellaneous Calculations

4-1 Conduit Size—Two or More Conductors of the Same Size

4-2 Different-Size Conductors

4-3 Sizing Junction Boxes for #6 and Smaller Conductors

4-4 Junction Boxes for #4 and Larger Conductors

4-5 Over 600 Volts

4-6 Shielded Cable

4-7 Grounding Electrode Conductor

4-8 Equipment Grounding Conductor

4-9 Sizing Neutral Conductors

Open Neutral

4-10 Overcurrent Protection

Air Conditioning and Refrigeration Equipment

Welders

Transformers

4-11 Phase Identification

Tape Measure Method

Chapter 4 Test

5 Motors

5-1 Introduction

5-2 Branch Circuit Conductors

5-3 Running Overload Protection

5-4 Branch Circuit Short Circuit and Ground-Fault Protection

5-5 Control Circuits

5-6 Controllers

5-7 Disconnecting Means

5-8 Fire Pumps, Controllers, and Motors

5-9 Common Motor Connections

Three-Lead Three-Phase Motors

Six-Lead and 12-Lead Motors

Nine-Lead Motors

Two-Speed Motors

5-10 Load Classification

Chapter 5 Test

6 Single-Dwelling Load Calculations

6-1 General Lighting and Receptacles

6-2 Ovens and Cooktops

6-3 Heating and Air Conditioning

6-4 Electric Clothes Dryer

6-5 Fixed Appliances

6-6 Load Calculation for a Single-Family Dwelling

6-7 Addition to Existing Dwelling

6-8 Optional Calculation for Single-Family Dwelling

6-9 Optional Calculation for a Two-Dwelling Unit

Chapter 6 Test

7 Multifamily Load Calculations

7-1 Standard Calculations

7-2 Ovens of Unequal Rating

7-3 House Loads for Multifamily Dwellings

7-4 Optional Calculation for Multifamily Dwelling

7-5 Laundry in Each Unit

7-6 Optional Calculation without Electric Cooking Equipment

Chapter 7 Test

8 Commercial Calculations

8-1 General

8-2 Single-Phase Small Commercial Calculation

8-3 Three-Phase Small Commercial Calculation

8-4 Three-Phase, Medium-Size Commercial Building

8-5 Convenience Store

8-6 Adding to Existing Service

8-7 Restaurant Calculations Standard

8-8 Restaurant Calculations, Optional

Chapter 8 Test

9 Miscellaneous Service Entrance Calculations

9-1 School Calculation

9-2 Computing Farm Loads

9-3 Computing Mobile Homes and Mobile Home Parks

9-4 Recreational Vehicles and Parks

9-5 High-Rise Hotel

9-6 Machine Shop

Chapter 9 Test

10 Conduit Bending

10-1 Offsets

Method 1

Method 2

Method 3

10-2 Multiple Offsets

10-3 Kicks

10-4 Three-Point Saddle

10-5 Four-Point Saddles

10-6 Ninety Degree Bends

Back-to-Back 90 Degree Bends

10-7 Segment Bending

10-8 Circular Bends on Large Vessels

10-9 Concentric 90 Degree Bends, Fast and Easy

Chapter 10 Test

11 Math Review

11-1 Fractions

11-2 Percentage

11-3 Decimals

11-4 Basic Algebra

11-5 Angles

11-6 Square Roots

11-7 Metric Measurements

Temperature Conversions

Linear Measurement

Weight Measurements

Liquid Measurement

Chapter 11 Test

Final Test

Answers to End-of-Chapter Tests and Final Test

Index