Save this PDF as:

Size: px
Start display at page:

## Transcription

1 CHAPTER 1 ElECTRiCAl THEoRY... 1 UniT 1 electrician s MaTH and BasiC electrical formulas... 3 Introduction to Unit Part A Electrician s Math... 3 Introduction Whole Numbers Decimals Fractions Percentages Multiplier Percent Increase Reciprocals Squaring a Number Parentheses Square Root Volume Kilo Rounding Off Testing Your Answer for Reasonableness... 9 Part B Basic Electrical Formulas...10 Introduction Electrical Circuit Power Source Conductance Circuit Resistance Ohm s Law Ohm s Law and Alternating Current Ohm s Law Formula Circle PIE Formula Circle Formula Wheel Using the Formula Wheel Power Losses of Conductors Cost of Power Power Changes with the Square of the Voltage...18 Conclusion to Unit Unit 1 Practice Questions...21 Unit 1 Challenge Questions...26 UniT 2 electrical CiRCUiTs...28 Introduction to Unit Part A Series Circuits Practical Uses of the Series Circuit Understanding Series Calculations Series Circuit Calculations Power Calculations Variations Series Circuit Notes Series-Connected Power Supplies...34 Part B Parallel Circuits...34 Introduction Practical Uses of the Parallel Circuit Understanding Parallel Calculations Circuit Resistance Parallel Circuit Notes Parallel-Connected Power Supplies...40 Part C Series-Parallel Circuits...40 Introduction Review of Series and Parallel Circuits Working With Series-Parallel Circuits Voltage...42 Part D Multiwire Branch Circuits...42 Introduction Neutral Conductor Grounded Conductor Current Flow on the Neutral Conductor Balanced Systems Unbalanced Current Multiwire Branch Circuits Dangers of Multiwire Branch Circuits NEC Requirements...48 Conclusion to Unit Unit 2 Practice Questions...50 Unit 2 Challenge Questions...55 UniT 3 UndeRsTanding alternating CURRenT...59 Introduction to Unit Part A Understanding Alternating Current...59 Introduction Current Flow Why Alternating Current is Used How Alternating Current is Produced AC Generator Waveform Sine Wave Frequency Phase Degrees Lead or Lag Values of Alternating Current...64 Part B Capacitance...64 Introduction Charged Capacitor Electrical Field Discharging a Capacitor...66 Mike Holt enterprises, inc neC.Code ( ) v

2 3.15 Determining Capacitance Uses of Capacitors Phase Relationship...67 Part C Induction...68 Introduction Self-Induction Induced Voltage and Applied Current Conductor AC Resistance Conductor Shape Magnetic Cores Self-Induced and Applied Voltage Inductive Reactance Phase Relationship Uses of Induction...73 Part D Power Factor...73 Introduction Apparent Power (Volt-Amperes) True Power (Watts) Power Factor Unity Power Factor Power Factor Formulas Cost of True Power Effects of Power Factor...77 Part E Efficiency...78 Introduction Efficiency Formulas...79 Conclusion to Unit Unit 3 Practice Questions...81 Unit 3 Challenge Questions...88 Unit 4 Motors and Transformers...92 Introduction to Unit Part A Motor Basics...92 Introduction Motor Principles Dual-Voltage AC Motors Motor Horsepower Ratings Motor Current Ratings Calculating Motor FLA Motor-Starting Current Motor-Running Current Motor Locked-Rotor Current (LRC) Motor Overload Protection Direct-Current Motor Principles Direct-Current Motor Types Reversing the Rotation of a DC Motor AC Induction Motor Alternating-Current Motor Types Reversing the Rotation of an AC Motor...99 Part B Transformers...99 Introduction Transformer Basics Secondary Induced Voltage Efficiency Transformer Turns Ratio Autotransformers Power Losses Transformer kva Rating Current Flow Current Rating Conclusion to Unit Unit 4 Practice Questions Unit 4 Challenge Questions CHAPTER 2 NEC CalcuLations Unit 5 Raceway and Box Calculations Introduction to Unit Part A Raceway Fill Introduction Understanding the NEC, Chapter 9 Tables Raceway Calculations Wireways Tips for Raceway Calculations Part B Outlet Box Fill Calculations [314.16] Introduction Sizing Box Conductors All the Same Size [Table (A)] Conductor Equivalents Outlet Box Sizing [314.16(B)] Part C Pull Boxes, Junction Boxes, and Conduit Bodies Introduction Pull/Junction Box Sizing Requirements Pull/Junction Box Sizing Tips Pull Box Examples Summary Conclusion to Unit Unit 5 Practice Questions Unit 5 Challenge Questions Unit 6 Conductor Sizing and Protection Calculations Introduction to Unit Part A General Conductor Requirements Introduction Conductor Insulation [Table ] Conductor Sizing [110.6] Smallest Conductor Size [310.5] Conductor Size Terminal Temperature Rating [110.14(C)] Conductors in Parallel NEC Requirements for Conductors in Parallel [310.4] Overcurrent Protection [Article 240] Overcurrent Protection of Conductors General Requirements [240.4] Overcurrent Protection of Conductors Specific Requirements vi Mike Holt s Illustrated Guide to NEC Exam Preparation

3 Part B Conductor Ampacity Introduction Conductor Ampacity Ambient Temperature Correction Factor [Table ] Conductor Bundling Ampacity Adjustment Factor [Table (B)(2)(a)] Ambient and Conductor Bundling Adjustment Current-Carrying Conductors Conductor Sizing Summary Conclusion to Unit Unit 6 Practice Questions Unit 6 Challenge Questions Unit 7 Motor and Air-Conditioning Calculations Introduction to Unit Part A Motor Calculations Scope of Article FLC Versus Motor Nameplate Highest Rated Motor [430.17] Branch-Circuit Conductor Size Feeder Conductor Size [430.24] Overload Protection [430.6(A)(2) and (A)] Branch-Circuit Short-Circuit and Ground-Fault Protection [430.51] Branch-Circuit Summary Feeder Protection [430.61] Motor VA Calculations Part B Air-Conditioning Calculations Scope of Article Other Articles Short-Circuit and Ground-Fault Protection Conductor Sizing for Single Motor-Compressor Conclusion to Unit Unit 7 Practice Questions Unit 7 Challenge Questions Unit 8 Voltage-Drop Calculations Introduction to Unit PART A CONDUCTOR RESISTANCE CALCULATIONS Introduction Conductor Resistance Conductor Resistance Direct-Current Circuits [Chapter 9, Table 8] Conductor Resistance Alternating-Current Circuits Alternating-Current Resistance AC Resistance as Compared to DC Resistance PART B Voltage-Drop Considerations Introduction NEC Voltage-Drop Recommendations Determining Circuit Conductors Voltage Drop Ohm s Law Method Determining Circuit Conductors Voltage Drop Formula Method Sizing Conductors to Prevent Excessive Voltage Drop Limiting Conductor Length to Minimize Voltage Drop Limiting Current to Limit Voltage Drop Fire Pump Motor Circuits Sizing Conductors with Loads at Different Distances Conclusion to Unit Unit 8 Practice Questions Unit 8 Challenge questions Unit 9 Dwelling Unit Calculations Introduction to Unit Part A General Requirements Introduction General Requirements Voltages [220.5(A)] Fraction of an Ampere [220.5(B)] Small-Appliance Circuits [210.11(C)(1)] Cooking Equipment Branch Circuit [Table , Note 4] Laundry Circuit [210.11(C)(2)] Lighting and Receptacles PART B Standard Method Feeder/Service Load Calculations Introduction Dwelling Unit Feeder/Service Load Calculations (Article 220, Part III) Dwelling Unit Example Part C Optional Method Feeder/Service Load Calculations Introduction Dwelling Unit Optional Calculations [220.82] Optional Calculation Example Part D Other Topics of Interest Neutral Calculations [220.61] Grounding and Bonding of Service Equipment Conclusion to Unit Unit 9 Practice Questions Unit 9 Challenge Questions CHAPTER 3 Advanced NEC Calculations Unit 10 Multifamily Dwelling Calculations Introduction to Unit Multifamily Dwelling Calculations General Part A Standard Method Feeder/Service Load Calculations Introduction Multifamily Dwelling Unit Calculation Examples Standard Method Multifamily Dwelling Calculations Standard Method Example Mike Holt Enterprises, Inc NEC.CODE ( ) vii

4 Part B Optional Method Feeder/Service Load Calculations Introduction Multifamily Dwelling Unit Calculations [220.84] Optional Method Multifamily Optional Method Example 1 [220.84] Multifamily Optional Method Example 2 [220.84] Conclusion to Unit 10 Multifamily Dwelling Calculations Unit 10 Practice Questions Unit 10 Challenge Questions Unit 11 Commercial Calculations Introduction to Unit Part A General Introduction General Requirements Conductor Ampacity [Article 100] Conductor Overcurrent Protection [240.4] Voltages [220.5(A)] Rounding an Ampere [220.5(B)] Lighting Demand Factors [Tables and ] Lighting Without Demand Factors [215.2(A)(1), (A)(1), and Table ] Lighting Miscellaneous Multioutlet Receptacle Assembly [220.14(H)] Receptacle VA Load Banks and Offices General Lighting and Receptacles [220.14(K)] Sign Circuit [220.14(F) and 600.5] Part B Examples Bank/Office Building Example Marina [555.12] Mobile/Manufactured Home Park [550.31] Recreational Vehicle Park [551.73] Part C Optional Method Feeder/Service Load Calculations Introduction New Restaurant Optional Method [220.88] Part D Welders Introduction Arc Welders Resistance Welders Light Industrial Calculation Conclusion to Unit Unit 11 Practice Questions Unit 11 Challenge Questions Unit 12 Transformer calculations Introduction to Unit Part A General Introduction Transformer Basics Secondary Induced Voltage Autotransformers Power Losses Efficiency Delta/Delta Connected Transformers Delta/Wye Connected Transformers Transformer Turns Ratio Transformer kva Rating Current Flow Line Currents Part B NEC Requirements Transformer Overcurrent Protection Primary Conductor Sizing Secondary Conductor Sizing Grounding and Bonding Available Short-Circuit Current Conclusion to Unit Unit 12 Practice Questions Unit 12 Challenge Questions Chapter 4 NEC Practice Quizzes, Challenge Quizzes, and Final NEC Exams Practice Quizzes Unit 1 Practice Questions in Straight Order Article 90.1 through Unit 1 Practice Questions in Random Order Article 100 through Unit 2 Practice Questions in Straight Order Article through Unit 2 Practice Questions in Random Order Article 90.2 through Unit 3 Practice Questions in Straight Order Article through Unit 3 Practice Questions in Random Order Article 90.2 through Unit 4 Practice Questions in Straight Order Article 100 through Unit 4 Practice Questions in Random Order Article 90.1 through Unit 5 Practice Questions in Straight Order Article through Unit 5 Practice Questions in Random Order Article 90.4 through Unit 6 Practice Questions in Straight Order Article through Unit 6 Practice Questions in Random Order Article 90.2 through Unit 7 Practice Questions in Straight Order Article through viii Mike Holt s Illustrated Guide to NEC Exam Preparation

5 Unit 7 Practice Questions in Random Order Article 90.2 through Unit 8 Practice Questions in Straight Order Article through Unit 8 Practice Questions in Random Order Article 90.2 through Unit 9 Practice Questions in Straight Order Article through Unit 9 Practice Questions in Random Order Article 90.3 through Unit 10 Practice Questions in Straight Order Article through Chapter Unit 10 Practice Questions in Random Order Article 90.3 through Annex C Challenge Quizzes Challenge Quiz 1 Article 90 through Chapter Challenge Quiz 2 Article 90 through Chapter Challenge Quiz 3 Article 90 through Chapter Challenge Quiz 4 Article 90 through Chapter Challenge Quiz 5 Article 90 through Chapter Challenge Quiz 6 Article 90 through Chapter Challenge Quiz 7 Article 90 through Chapter Final Exams Final Exam 1 Practice Questions in Random Order Article 90 through Annex C Final Exam 2 Practice Questions in Random Order Article 90 through Annex C Mike Holt Enterprises, Inc NEC.CODE ( ) ix

### UNIT 1 ELECTRICIAN S MATH AND BASIC ELECTRICAL FORMULAS...1 Introduction...1. UNIT 2 ELECTRICAL CIRCUITS...49 Introduction...49

UNIT 1 ELECTRICIAN S MATH AND BASIC ELECTRICAL FORMULAS...1 Introduction...1 PART A ELECTRICIAN S MATH...1 Introduction...1 1.1 Whole Numbers...1 1.2 Decimal...1 1.3 Fractions...1 1.4 Percentages...2 1.5

### Chapter 1 Electrical Theory...1

Electrical Formulas with Sample Calculations Table of Contents Chapter 1 Electrical Theory...1 Unit 1 Electrician s Math and Basic Electrical Formulas...3 Part A Electrician s Math...3 1 1 Fractions...3

### Preface...x Chapter 1 Electrical Fundamentals

Preface...x Chapter 1 Electrical Fundamentals Unit 1 Matter...3 Introduction...3 1.1 Matter...3 1.2 Atomic Theory...3 1.3 Law of Electrical Charges...4 1.4 Law of Atomic Charges...5 Negative Atomic Charge...5

### Electrical Tech Note 106

Electrical Tech Note 106 Biosystems & Agricultural Engineering Department Michigan State University Master Exam Study Guide and Sample Questions 1 Based on the 2014 NEC, Part 8 of PA 230, PA 407, and the

### Chapter 2 Wiring and Protection Article 200 Use and Identification of Grounded Neutral Conductor Chapter 1 General...9

Article 90 Introduction...1 90.1 Purpose of the NEC...1 90.2 Scope of the NEC...2 90.3 Code Arrangement...4 90.4 Enforcement...5 90.5 Mandatory Requirements and Explanatory Material...6 90.6 Formal Interpretations...6

### Spring Test 10 due 05/11/2013

Spring Test 10 due 05/11/2013 Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. 1. When installed in an agricultural building that houses livestock

### CHAPTER V RESIDENTIAL WIRING

CHAPTER V RESIDENTIAL WIRING 5.1. THE SERVICE ENTRANCE Buildings and other structures receive the electrical energy through the service entrance. In residential wiring, the electric company supply this

### PART A General Conductor Requirements

PART A General Conductor Requirements 6.1 Conductor Insulation Property Table 310.13 of the NEC provides information on conductor properties such as permitted use, maximum operating temperature, and other

### ECET 211 Electric Machines & Controls Lecture 8 Motor Control Circuits (1 of 2) Lecture 8 Motor Control Circuits

ECET 211 Electric Machines & Controls Lecture 8 Motor Control Circuits (1 of 2) Text Book: Electric Motors and Control Systems, by Frank D. Petruzella, published by McGraw Hill, 2015. Paul I-Hai Lin, Professor

### MECKLENBURG COUNTY. Land Use and Environmental Service Agency Code Enforcement 2/8/12 ELECTRICAL CONSISTENCY MEETING. Code Consistency Questions

MECKLENBURG COUNTY Land Use and Environmental Service Agency Code Enforcement 2/8/12 ELECTRICAL CONSISTENCY MEETING Code Consistency Questions 1. I am inspecting a building addition. They have a 480V to

### Application Techniques. North American Standards, Configurations, and Ratings: Introduction to Motor Circuit Design

Application Techniques North American Standards, Configurations, and Ratings: Introduction to Motor Circuit Design Important User Information Solid-state equipment has operational characteristics differing

### Overcurrent Protection According to the 2011 NEC

Overcurrent Protection According to the 2011 NEC Utah Electrical License This course will cover overcurrent protection according to the 2011 NEC. The key sections of Article 240 will be discussed. Overcurrent

### Overcurrent Protection (2014 NEC) (Homestudy)

Overcurrent Protection (2014 NEC) (Homestudy) Oregon Electrical License The key sections of Article 240 will be discussed. Overcurrent protection for panelboards, appliances, motors, motor compressors,

### lectronic starter for single phase duction motor

lectronic starter for single phase duction motor PROJECT NO: 104 SUPERVISOR: DR. WEKESA EXAMINER: PROF MANG OLI Prepared by: GITONGA HILDA WANJIKU- F17/39921/2011 PROJECT OUTLINE 1. Project Objective 2.

### 2. DEFINITIONS. 2.3 APPROVED Acceptable to the authority enforcing the National Electric Code

2. DEFINITIONS 2.1 ACCEPTABLE Acceptable to the Company. 2.2 ADVANCED METER A meter that is capable of remote reading, and is capable of storing electric consumption data at specified time intervals of

### NEC REQUIREMENTS FOR GENERATORS

PROFESSIONAL DEVELOPMENT SEMINAR SERIES NEC REQUIREMENTS FOR GENERATORS (Based on NEC 2005 with limited 2008 commentary) AIA certified Continuing Education Units (CEU) Available GPS-140 National Electric

### Motor Protection. Voltage Unbalance & Single-Phasing

For Summary of Suggestions to Protect Three-Phase Motors Against Single-Phasing see the end of this section, page 137. Historically, the causes of motor failure can be attributed to: Overloads 30% Contaminants

### TECHNICAL TERMS AND ABBREVIATIONS

THIRD REVISED SHEET NO. 3.1 CANCELS SECOND REVISED SHEET NO. 3.1 TECHNICAL TERMS AND ABBREVIATIONS ALTERNATING CURRENT (A-C): AMPERE: BASE RATES: BRITISH THERMAL UNIT (BTU): CAPACITOR or CAPACITANCE: CAPACITY

### FACT SHEET Standard: Electrical Safety

What is a Ground Fault Circuit Interrupter? FACT SHEET The ground-fault circuit interrupter, or GFCI, is a fast-acting circuit breaker designed to shut off electric power in the event of a ground-fault

### Electric Motor Controls BOMA Pre-Quiz

Electric Motor Controls BOMA Pre-Quiz Name: 1. How does a U.P.S. (uninterruptable power supply) work? A. AC rectified to DC batteries then inverted to AC B. Batteries generate DC power C. Generator, batteries,

### SINGLE PHASE WIRING SPECIFICATIONS

SINGLE PHASE WIRING SPECIFICATIONS 1-866-MEC-ELEC (1-866-632-3532) Office Locations: Hondo Office 237 Hwy 173 N Hondo, TX 78661-0370 Fax 830.426.3335 Dilley Office 1718 W. FM 117 Dilley, TX 78017 Fax 830.965.1425

### THREE PHASE WIRING SPECIFICATIONS

THREE PHASE WIRING SPECIFICATIONS 1-866-MEC-ELEC (1-866-632-3532) Office Locations: Hondo Office 237 Hwy 173 N Hondo, TX 78661-0370 Fax 830.426.3335 Dilley Office 1718 W. FM 117 Dilley, TX 78017 Fax 830.965.1425

### CONTINUING EDUCATION FOR OREGON ELECTRICIANS NEC Code Change Part 2 Course # Hours

AMERICAN ELECTRICAL INSTITUTE 2017 PART 2 3 CONTINUING EDUCATION FOR OREGON ELECTRICIANS 2017 NEC Code Change Part 2 Course #90817 8 Hours AMERICAN ELECTRICAL INSTITUTE N16 W23217 Stone Ridge Drive, Suite

### TRANSMISSION SYSTEMS

TRANSMISSION SYSTEMS Transmitting large amounts of electric energy over long distances is accomplished most efficiently by using high-voltages. Without transformers the widespread distribution of electric

### Gay E. Canough. OFF-GRID Design. Dr. Gay E. Canough, Master trainer. Living Off the Grid

OFF-GRID Design Dr. Gay E. Canough, Master trainer 1 Understand the Customer s load 2 Load sizing Gay E. Canough AC Appliance watts amps how many of these? number of hours it is used per day equals watt-hr/

### Power Quality Luis Vargas Research Engineer 9/18/2008

Page: 1 of 5 Luis Vargas Research Engineer 9/18/2008 Page: 2 of 5 As we make advances on green technology, we get a better understanding of the efficiencies and deficiencies on how we consume electricity.

### Equipment Protection. Listed or Labeled Equipment. Panelboards. Branch Circuit Protection HVAC. Appliances. Supplementary Protection

Listed or Labeled Equipment Listed or labeled equipment must be installed in accordance with instructions included in the listing or labeling [110.3(B)]. Be sure to observe maximum branch circuit fuse

### Pump ED 101. Power Factor (Part 2) - - Electricity Behaving Better

Pump ED 101 Power Factor (Part 2) - - Electricity Behaving Better Joe Evans, Ph.D http://www.pumped101.com Last month we took a close look at the flow of voltage and current in purely resistive and inductive

### High Reliability Power System Design

High Reliability Power System Design Buenos Aires, Argentina June 25 & 26, 2009 Keene M. Matsuda, P.E. Regional Electrical Manager Senior Member IEEE IEEE/PES Distinguished Lecturer ke.matsuda@ieee.org

### Motor Protection. Voltage Unbalance & Single-Phasing

Voltage Unbalance & Single-Phasing For Summary of Suggestions to Protect Three-Phase otors Against Single-Phasing see the end of this section, page 37. Historically, the causes of motor failure can be

### Renewable Energy Systems 14

Renewable Energy Systems 14 Buchla, Kissell, Floyd Chapter Outline The Electric Power Grid 14 Buchla, Kissell, Floyd 14-1 THREE-PHASE AC 14-2 THREE-PHASE TRANSFORMERS 14-3 GRID OVERVIEW 14-4 SMART GRID

### Definitions of and have been revised. a. automatic b. nonautomatic c. none of the above d. both a and b

www.garyklinka.com Page 1 of 12 Instructions: Fee \$25 1. Print these pages. 2. Circle the correct answers and transfer them to the answer sheet. 3. Page down to the last page for the verification forms

### White Paper. Application of Resistive/Reactive Load Banks for kva Testing

White Paper Application of Resistive/Reactive Load Banks for kva Testing Application of Resistive/Reactive Load Banks for kva Testing Resistive load banks are the most commonly used load banks for the

### Photovoltaic Solar Plan Review

PAIGE B. VAUGHAN, CBO Director of Building and Safety Phone (310) 605-5509 Fax Line (310) 605-5598 E-mail:lbutler@comptoncity.org Building & Safety Department Photovoltaic Solar Plan Review Plan Check

### A. Submit manufacturer's literature and technical data before starting work.

SECTION 16425 SWITCHBOARD PART 1 GENERAL 1.01 SUMMARY A. Related Section: 1. 16450 - Grounding. 1.02 SUBMITTALS A. Submit manufacturer's literature and technical data before starting work. B. Submit Shop

### ECET 211 Electric Machines & Controls Lecture 5-4 Electric Motors. Lecture 5-1 Electric Motors

ECET 211 Electric Machines & Controls Lecture 5-4 Electric Motors (4 of 4) Text Book: Chapter 5 Electric Motors, Electric Motors and Control Systems, by Frank D. Petruzella, published by McGraw Hill, 2015

### ARKANSAS ELECTRICIANS

CONTINUING EDUCATION FOR ARKANSAS ELECTRICIANS 2014 NEC Code Change 8 Hours AMERICAN ELECTRICAL INSTITUTE N16 W23217 Stone Ridge Drive, Suite 290 Waukesha, WI 53188 855-780-5046 www.aeitraining.com DISCLAIMER

### Motor Basics AGSM 325 Motors vs Engines

Motor Basics AGSM 325 Motors vs Engines Motors convert electrical energy to mechanical energy. Engines convert chemical energy to mechanical energy. 1 Motors Advantages Low Initial Cost - \$/Hp Simple &

### CHAPTER 19 DC Circuits Units

CHAPTER 19 DC Circuits Units EMF and Terminal Voltage Resistors in Series and in Parallel Kirchhoff s Rules EMFs in Series and in Parallel; Charging a Battery Circuits Containing Capacitors in Series and

### Technical Specification for Pole Mounted Capacitor Rack

Technical Specification for Pole Mounted Rack Page 1 1. Scope and Function a) Pole mounted capacitor racks shall be installed on a distribution feed as an economical means of applying capacitor units to

### Chapter 4 NEC & NEMA Standards 1

Chapter 4 NEC & NEMA Standards 1 This section lists excerpts from industry, national, and international standards The excerpts are for illustration and educational purposes There are often several related

### GFCI-AFCI FAQ. Where are AFCIs and GFCIs required?

GFCI-AFCI FAQ What does an AFCI do? o An AFCI will shut down, or trip, a branch circuit when certain conditions are met. AFCIs monitor the circuit for arc faults, an unintentional electrical discharge

### Electrical Energy and Power Ratings

Section 1 - From the Wall Socket Electrical Energy and ower Ratings Batteries and the mains are sources of electrical energy. Electrical appliances can then convert this into other forms of energy. e.g.

### Arc Fault Circuit Interrupter (AFCI) FACT SHEET

Arc Fault Circuit Interrupter (AFCI) FACT SHEET THE AFCI The AFCI is an arc fault circuit interrupter. AFCIs are newly-developed electrical devices designed to protect against fires caused by arcing faults

### Ignition Coil Current Waveforms 2007 Honda Accord SE 4CYL

P a g e 1 Ignition Coil Current Waveforms 2007 Honda Accord SE 4CYL With a current clamp and a cheap scope, it is easy to monitor the ignition coil currents and quickly diagnose a bad ignition coil. The

### LUNERA BALLASTLED TECHNOLOGY AND POWER FACTOR

LUNERA BALLASTLED TECHNOLOGY AND POWER FACTOR Replacing metal halide lamps in magnetic ballast-driven fi xtures with the Lunera MH HID LED Gen 2, a LED plug-and-play replacement, causes the ballast to

### Cylinder Balance and Percent Changes Lesson 11

Cylinder Balance and Percent Changes Lesson 11 Remember: Pretty Please My Dear Aunt Sally (From left to right; Parentheses; Power; Multiply; Divide; Add, Subtract) Identify The Math, Math Terms, Vocabulary,

### ECET 211 Electric Machines & Controls Lecture 5-4 Electric Motors. Lecture 5-4 Electric Motors

ECET 211 Electric Machines & Controls Lecture 5-4 Electric Motors (4 of 4) Text Book: Chapter 5 Electric Motors, Electric Motors and Control Systems, by Frank D. Petruzella, published by McGraw Hill, 2015.

### PHOTOVOLTAIC ELECTRICAL POWER SYSTEMS INSPECTOR/INSTALLER CHECKLIST

PHOTOVOLTAIC ELECTRICAL POWER SYSTEMS INSPECTOR/INSTALLER CHECKLIST The following checklist is an outline of the general requirements found in the 2005 National Electrical Code (NEC) Article 690 for Photovoltaic

### UPS Ratings-Not so Apparent

App Notes ~ Outdoor Power System Design and Cost Considerations Application Notes Outdoor Power System Design and Cost Considerations 1 Authors Peter Nystrom President TSi Power Corp. Jason Marckx Chief

### Busway. Siemens STEP 2000 Course. STEP 2000 Courses distributed by

Siemens STEP 2000 Course Busway It's easy to get in STEP! Download any course. Hint: Make sure you download all parts for each course and the test answer form. Complete each chapter and its review section

### ELECTRICAL POWER DISTRIBUTION FOR INFORMATION TRANSPORT SYSTEMS

ELECTRICAL POWER DISTRIBUTION FOR INFORMATION TRANSPORT SYSTEMS Bob Hertling Senior Communications Engineer / RCDD, OSP PARSONS Your ITS equipment requires AC power Do you know what is on the other side

### Data Bulletin. Wire Temperature Ratings and Terminations INTRODUCTION WHY ARE TEMPERATURE RATINGS IMPORTANT?

Data Bulletin March 2002 Lexington, KY, USA Wire Temperature Ratings and Terminations INTRODUCTION WHY ARE TEMPERATURE RATINGS IMPORTANT? Table 1: Insulation Type Figure 1: Figure 2: Ampacity of a 1/0

### Knowledge Objectives (3 of 3) Electricity. Skills Objectives (2 of 2) 12/20/2013

Electricity and Fire Knowledge Objectives (1 of 3) Explain basic electricity. Discuss the elements of Ohm s law and how they relate to each other. Discuss the role of ampacity in electrical conductors.

### LUNERA BALLASTLED TM TECHNOLOGY AND POWER FACTOR

LUNERA BALLASTLED TM TECHNOLOGY AND POWER FACTOR Replacing metal halide lamps in magnetic ballast-driven fi xtures with the Lunera Susan Lamp, a LED plug-and-play replacement, causes the ballast to have

### Chapter 3.1: Electrical System

Part-I: Objective type Questions and Answers Chapter 3.1: Electrical System 1. The heat input required for generating one kilo watt-hour of electrical output is called as. a) Efficiency b) Heat Rate c)

### ECET 211 Electric Machines & Controls Lecture 6 Contactors and Motor Starters. Lecture 6 Contactors and Motor Starters

ECET 211 Electric Machines & Controls Lecture 6 Contactors and Motor Starters Text Book: Chapter 6, Electric Motors and Control Systems, by Frank D. Petruzella, published by McGraw Hill, 2015. Paul I-Hai

### DIY 15 Amp Portable Generator Transfer Switch

DIY 15 Amp Portable Generator Transfer Switch ------------------------------------------------------------------------------------------------- WARNING You MUST read these warnings before proceeding. This

### 2-marks question bank UNIT I - TRANSFORMERS UNIT II: AC MACHINES

2-marks question bank UNIT I - TRANSFORMERS 1. What is all day efficiency? 2. What are the applications of auto transformers? 3. Why transformer rating is expressed in KVA? 4. Does transformer draw any

### CHAPTER 6 DESIGN AND DEVELOPMENT OF DOUBLE WINDING INDUCTION GENERATOR

100 CHAPTER 6 DESIGN AND DEVELOPMENT OF DOUBLE WINDING INDUCTION GENERATOR 6.1 INTRODUCTION Conventional energy resources are not sufficient to meet the increasing electrical power demand. The usages of

### Solar PV Standard Plan Simplified Microinverter and ACM Systems for One- and Two-Family Dwellings

TOOLKIT DOCUMENT #4 Solar Standard Plan Simplified Microinverter and M Systems for One- and Two-Family Dwellings SCOPE: Use this plan ONLY for systems using utility-interactive Microinverters or Modules

### Question Set(2017) Switch Gear & protection(5 th SEm) 9. Explain the construction and operating principle with proper diagram:

Question Set(2017) Switch Gear & protection(5 th SEm) 1. What is fault in power system? Classify the fault. What are the bad effects of fault? 2. Define with example: Symmetrical fault and unsymmetrical

### AE105 PRINCIPLES OF ELECTRICAL ENGINEERING JUNE 2014

Q.2 a. Explain in detail eddy current losses in a magnetic material. Explain the factors on which it depends. How it can be reduced? IETE 1 b. A magnetic circuit with a single air gap is shown in given

### Transmission & Distribution Glossary of Electrical Terms

Transmission & Distribution Glossary of Electrical s Breaker Panel Bushing Circuit Circuit Breaker Conductor Conduit Consumption Current Distribution Electricity (Static vs. Current) Electron Feeder The

### Significant Changes to the Philippine Electrical Code 2009 Edition

Significant Changes to the Philippine Electrical Code 2009 Edition Jaime V. Mendoza, MTM Board Member 2 PEC 2009 (8 th Edition) BEE Resolution No. 12 Series of 2009 Adoption of the Revised (8 th Edition)

### MAIN ELECTRIC MOTOR 900 HP 4000 V 60 HZ MAKE: RELIANCE ELECTRIC

MAIN ELECTRIC MOTOR 9 HP 4 V 6 HZ MAKE: RELIANCE ELECTRIC E.I DUPONT DE NEMOURS & CO. COOPER RIVER PROJECT PROJ: 76P PO: # LCRCP-5W RELIANCE FRAME HP TYPE PHASE HERTZ RPM SALES ORDER B795 588 9 P 6

### 2000 Cooper Bussmann, Inc. Page 1 of 9 10/04/00

DO YOU KNOW THE FACTS ABOUT SINGLE-POLE INTERRUPTING RATINGS? YOU MAY BE IN TROUBLE! Typical plant electrical systems use three-phase distribution schemes. As an industry practice, short-circuit calculations

### CHAPTER 3. Basic Considerations and Distribution System Layout

CHAPTER 3 Basic Considerations and Distribution System Layout Utility Load Classifications The electrical power distribution system is that portion of the electrical system that connects the individual

### VIII. Three-phase Induction Machines (Asynchronous Machines) Induction Machines

VIII. Three-phase Induction Machines (Asynchronous Machines) Induction Machines 1 Introduction Three-phase induction motors are the most common and frequently encountered machines in industry simple design,

### Motor Branch Circuit Over-Current Protection

Motor Branch Circuit Over-Current Protection For HVAC Project Engineers Fachgesprach 9 WTF Institute of Higher Learning By Mat Ansari PE 2-18-2016 For HVAC Project Engineer's Reference Use Only Not for

### NEC Article 620: Elevators, Part 2

CERTIFIED ELEVATOR TECHNICIAN Continuing Education NEC Article 620: Elevators, Part 2 by David Herres Learning Objectives After reading this article, you should have learned: Which locations require separate,

### 2017 NEC Electrical Review RV

PLEASE DO NOT BOOKMARK ANY ANYTIMECE WEBPAGES! Our system will remember the last page you viewed when logging out and back in but please DO NOT exit out when taking a test. Your place will NOT be saved.

### FUSES. Safety through quality

Safety through quality HH HIGH VOLTAGE Over many decades SIBA has developed a global product line of High Voltage Fuses that are comprehensive for any and all applications. Superior engineering, advanced

### Second Revision No. 25-NFPA [ Section No ]

Second Revision No. 25-NFPA 79-2013 [ Section No. 1.1.1 ] 1.1.1 The provisions of this standard shall apply to the electrical/electronic equipment, apparatus, or systems of industrial machines operating

### Dry Type Distribution Transformers

Selection Steps A. Use the following steps below to manually select a transformer. B. Find the electrical load requirements. These are: 1. Load operating voltage. 2. Load frequency (expressed in Hz). 3.

### SIGNAL WORDS QUALIFIED PERSON

SIGNAL WORDS The signal words Danger, Warning and Caution used in this manual indicate the degree of hazard that may be encountered by the user. These words are defined as: Danger - Indicates death or

### REQUIREMENTS FOR ELECTRICAL INSTALLATIONS

ARTICLE 110 REQUIREMENTS FOR ELECTRICAL INSTALLATIONS Introduction to Article 110 Requirements for Electrical Installations Article 110 sets the stage for how you ll implement the rest of the NEC. This

### Assessing a Site for Installation of Consumption Monitoring

TECHNICAL BRIEF Assessing a Site for Installation of Consumption Monitoring About the Enphase Envoy-S Metered The Enphase Envoy-S Metered communications gateway enables performance monitoring and remote

### Installation and Maintenance Instructions. World Leader in Modular Torque Limiters. PTM-4 Load Monitor

World Leader in Modular Torque Limiters Installation and Maintenance Instructions PTM-4 Load Monitor 1304 Twin Oaks Street Wichita Falls, Texas 76302 (940) 723-7800 Fax: (940) 723-7888 E-mail: sales@brunelcorp.com

### High Reliability Power System Design

High Reliability Power System Design Buenos Aires, Argentina June 25 & 26, 2009 Keene M. Matsuda, P.E. Regional Electrical Manager Senior Member IEEE IEEE/PES Distinguished Lecturer ke.matsuda@ieee.org

Overload Relay Tables of Elements for Overload Relays General Use only when motor full load current is not known. Motor amps will vary depending on the type and manufacturer of the motor. These average

### Inspector Training Workshops Module One Photovoltaic Labeling based on 2008 NEC

Inspector Training Workshops Module One Photovoltaic Labeling based on 2008 NEC NJCE Market Manager HW Construction Department Wayne, NJ Robert A. Menist Contents Site inspections with attention on Labeling

### 8.2 Electric Circuits and Electrical Power

8.2 Electric Circuits and Electrical Power Every electrical device uses current to carry energy and voltage to push the current. How are electrical devices designed? What types of parts are used in an

### Renewable Energy Systems 13

Renewable Energy Systems 13 Buchla, Kissell, Floyd Chapter Outline Generators 13 Buchla, Kissell, Floyd 13-1 MAGNETISM AND ELECTROMAGNETISM 13-2 DC GENERATORS 13-3 AC SYNCHRONOUS GENERATORS 13-4 AC INDUCTION

### 1RECHARGEABLE APPLIANCES

1RECHARGEABLE APPLIANCES 1 CAUTION Certain rechargers for small nickel cadmium batteries can be damaged if connected to the unit. Two types of equipment are particularly prone to this problem: 1. Small

### 7. How long must a 100-watt light bulb be used in order to dissipate 1,000 joules of electrical energy? 1) 10 s 3) 1,000 s 2) 100 s 4) 100,000 s

1. Which quantity must be the same for each component in any series circuit? 1) power 3) current 2) resistance 4) voltage 2. A student needs a 4-ohm resistor to complete a circuit. Only a large quantity

### OWNER S MANUAL. Please read installation and operation instruction before using this Power inverter.

OWNER S MANUAL DP AUDIO Model No. DN350 12 Volt DC to 115 Volt AC 150 WATT 300WATT HIGH SURGE POWER INVERTER Please read installation and operation instruction before using this Power inverter. Contents

### Spec Information. Reactances Per Unit Ohms

GENERATOR DATA Selected Model Spec Information Generator Specification Frame: 687 Type: SR4 No. of Bearings: 1 Winding Type: RANDOM WOUND Flywheel: 521.0 Connection: SERIES STAR Housing: 00 Phases: 3 No.

### 2011/2008/2005 NATIONAL ELECTRICAL CODE SOLAR PV CODE COMPLIANCE REFERENCE

2011/2008/2005 NATIONAL ELECTRICAL CODE SOLAR PV CODE COMPLIANCE REFERENCE PAGE 1 OF 5 This Reference provides a very comprehensive list of aspects of a solar PV installation that could be reviewed, clarifying

### Variable Frequency Drives

We Make Energy Engaging Variable Frequency Drives Questline Academy Meet Your Panelist Mike Carter questline.com 2 Contents Basics Motor Loads Operation Advantages/ Disadvantages Sizing a VFD Power Quality

### HOKKIM. Control & Protection Relays. giving you control. Utilization: Power Factor Regulator : 14-STEP CYCLIC POWER FACTOR REGULATOR.

HOKKIM giving you control Control & Protection Relays Model Description : HL-14c : 14-STEP CYCLIC POWER FACTOR REGULATOR. Utilization: Power Factor Regulator LEDs to indicate power on, capacitive or inductive

### Electrical Machines II. Week 5-6: Induction Motor Construction, theory of operation, rotating magnetic field and equivalent circuit

Electrical Machines II Week 5-6: Induction Motor Construction, theory of operation, rotating magnetic field and equivalent circuit Asynchronous (Induction) Motor: industrial construction Two types of induction

### PSNH INTERCONNECTION REQUEST

PSNH INTERCONNECTION REQUEST Send the completed Interconnection Request and required attachments to: Public Service of New Hampshire Attn: Michael Motta, Senior Engineer Supplemental Energy Sources P.

### TRI-SERVICE ELECTRICAL WORKING GROUP (TSEWG) 03/05/09 TSEWG TP-11: UFC N BEST PRACTICES

TSEWG TP-11: UFC 3-500-10N BEST PRACTICES UFC 3-500-10N was developed by NAVFAC and was used as the starting point for the tri-services development of UFC 3-500-10, Design: Electrical Engineering. UFC

### CHAPTER 13 MAGNETIC EFFECTS OF ELECTRIC CURRENT

CHAPTER 13 MAGNETIC EFFECTS OF ELECTRIC CURRENT Compass needle:- It is a small bar magnet, whose north end is pointing towards north pole and south end is pointing towards south pole of earth..hans Oersted

Table of Contents Foreword...xiii Chapter One Introduction, 9 1.1 Objectives of the Guide...1 Chapter Two Pumping System Hydraulic Characteristics, 3 2.1 System Characteristics...3 2.2 Pump Curves...9

### Circuits-Circuit Analysis

Base your answers to questions 1 through 3 on the information and diagram below. 4. A 9-volt battery is connected to a 4-ohm resistor and a 5-ohm resistor as shown in the diagram below. A 3.0-ohm resistor,

### Service Entrance Methods

Service Section Typical switchboards consist of a service section, also referred to as the main section, and one or more distribution sections. The service section can be fed directly from the utility