Electric Motors Calculations Workbook - Details
This 144 page workbook provides a comprehensive look at calculations for electric motors and more. There are over 5000 different questions and answers included. Audio support is provided for each calculations type. Click HERE to hear a sample of an audio file.
This workbook is printed on both sides of 8 1/2 x 11 inch three hole punched paper suitable for a three ring binder which is not provided. The workbook is also available 3 hole punched with a plastic spiral binding for an additional $5.
The workbook is published by ElectricianMath.com which is a companion website to ElectricianEducation.com. The author is David Ullian Larson.
Click HERE to see a sample calculations page.
Click HERE to see a sample answers page.
Click HERE to take the math pre test for this workbook with answers.
Let's see if this workbook is for you. Here's a ten question quiz. Get out your code book and calculator for these.
The motor which will be used for all five questions is a 5HP single phase 230 volt continuous duty typical motor. Nothing special about it. Let's say it powers a water pump. It has a service factor of 1.6. A temperature rise of 100 degrees F. The nameplate flc is 26.3 amps. It is located 50 feet from the electric service. The raceway which contains the conductors is not in the sunlight. There are only three conductors in the raceway run to the motor. All lugs associated with this motor are 75 degrees C.
1. What is the minimum ampere rating for a non fused disconnect switch based on the NEC?
2. What is the minimum allowable ampacity for a branch circuit conductor permitted to feed this 230 volt motor?
3. What is the initial standard maximum overcurrent protection device for this single motor if an inverse time breaker is planned?
4. If the initial standard maximum overcurrent protective device will not allow the motor to start and/or run, then what is the absolute maximum overcurrent protective device permitted?
5. What is the initial standard maximum overload permitted?
6. If the initial standard maximum overload does not allow the motor to start and/or run, then what is the absolute maximum overload permitted?
7. What is the minimum feeder size for four motors, all like the above, supplied from the same feeder with no additional other load?
8. What is the minimum allowable feeder conductor for these same four motors?
9. What is the minimum allowable horsepower rating of a non fused feeder disconnect for these same four motors?
10. What is the minimum allowable ampere rating of a non fused feeder disconnect for these same four motors?
If you miss the correct answer on even one of these questions, then the Electric Motors Calculations Workbook would be a useful tool to add to your study library. Why not Invest In Yourself? Brain tools pay big dividends. See the bottom of this page for a link to the answers.
Here is the table of contents from this workbook:
1 Front Cover
Basic Motor Aspects
Advanced Motor Calculations
See anything on this list you would like to know more about?
To order this workbook, click the Buy Now button below. You may pay with any debit or credit card. The price is $29.50 postpaid by USPS Priority Mail to any USA address. The workbook is also available with a plastic spiral binding added for $35.50 postpaid to any USA address.
As a bonus, you will also receive a copy of Reference Formulas Appendix. This useful tool can be added to any looseleaf edition of the NEC. It provides formulas, tables, and references useful to anyone working to answer electrical questions. Is is an excellent study tool for anyone preparing for an electrical exam at the Journeyman, Master or Inspector level. Click HERE to read more about this fantastic reference tool. It is sold separately for $14 postpaid. But it is an added bonus when you buy the Electric Motors Calculations Workbook at no additional charge.
Click HERE to see the answers to the above ten questions.
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