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Solution & Answer Guide – Electrical Wiring Residential (21st Edition) by Mullin, Simmons & Vigstol | ISBN: 9780357766965 | Step-by-Step Solutions $24.99
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Solution & Answer Guide – Electrical Wiring Residential (21st Edition) by Mullin, Simmons & Vigstol | ISBN: 9780357766965 | Step-by-Step Solutions

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Solutions For Electrical Wiring Residential (21st Edition) | Ray C. Mullin, Phil Simmons, Derek Vigstol, Solutions For Electrical Wiring Residential | Solutions Manual For Electrical Wiring Residential, 21st Edition | Electrical Wiring Residential, Twenty first Edition Solution & Answer Guide | Ray...

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  • March 28, 2025
  • 345
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • Electrical Wiring Residential
  • Electrical Wiring Residential

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SOLUTION AND ANSWER GUIDE

ELECTRICAL WIRING RESIDENTIAL
21ST EDITION


CHAPTER 1: GENERAL INFORMATION FOR ELECTRICAL
INSTALLATIONS


REVIEW QUESTION & ANSWERS


Refer to the NEC or the plans in the back of this text where necessary.


1. What code sets the standard for electrical installation work in the United States?


Answer: The NEC is the basic standard; local and state codes are to be considered also.

2. What entity enforces the requirements set by the NEC? Answer: The local electrical inspection authority or

Authority Having Jurisdiction(AHJ)


3. Does the NEC provide minimum or maximum standards?


Answer: Minimum

4. What do the letters “UL” signify?


Answer: When shown on an electrical product or in a certification mark, it means the product is Listed by

Underwriters Laboratories. It also means that the product met applicable safety standards when it left the

manufacturer’s plant.

5. What section of the NEC states that all listed or labeled equipment shall be installed or used in accordance

with any instructions included in the listing or labeling?


Answer: NEC 110.3(B)

6. When the word “shall” appears in an NEC reference, it means that it (must)(may) be done. (Select the

correct word.)

, Answer: Must

7. What is the purpose of the NEC? What section can this statement be found in?


Answer: The NEC states in 90.2(A) that “The purpose of this Code is the practical safeguarding of persons

and property from hazards arising from the use of electricity.”*

8. Does compliance with the NEC always result in an electrical installation that is adequate, safe, and

efficient? Why?


Answer: No. The NEC states in 90.2(B) that “This Code contains provisions that are considered necessary

for safety. Compliance therewith and proper maintenance results in an installation that is essentially free

from hazard but not necessarily efficient, convenient, or adequate for good service or future expansion of

electrical use.”*

Informational Note: Hazards often occur because of overloading of wiring systems by methods or usage not

in conformity with this Code. This occurs because initial wiring did not provide for increases in the use of

electricity. An initial adequate installation and reasonable provisions for system changes will provide for

future increases in the use of electricity.

9. Name two nationally recognized testing laboratories. Answer: Underwriters Laboratories (UL) and Intertek

Testing Services (ETL listing mark). There are other testing laboratories such as Canadian Standards

Association (CSA), Factory Mutual (FM), and others the student might refer to that may be acceptable to

the authority enforcing the Code.


10. a. Do Underwriters Laboratories and the other recognized testing laboratories “approve” products?


b. What do these testing laboratories do?


Answer: a. No. Approval is up to the Authority Having Jurisdiction. See NEC 90.4 and 110.2.

b. They test the products for conformance to applicable product safety standards. When the

product passes these tests, the manufacturer of the product is then permitted to affix a

“label” (often referred to as a “listing mark”) that indicates the product complied with the

applicable safety standard when it left their factory.

11. a. Has the NEC been officially adopted by the community in which you live?

, b. By the state in which you live?


c. If your answer is YES to (a) or (b), are there amendments to the NEC?


d. If your answer is YES to (c), list some of the more important amendments.


Answer: Student answers will vary, depending on where this course is taught. The questions refer to local

issues.

12. Does the NEC make suggestions about how to wire a house that will be occupied by handicapped persons?


Answer: Informative Annex J includes information that is intended to assist the users of the Code in

properly considering the various electrical design constraints of other building systems and are part of the

2010 ADA Standards for Accessible Design. The Informative Annex is not enforceable. The basic NEC

rules still apply. Local communities, counties, states, and/or other govern-mental bodies might have

requirements. Check with your local inspection authority. Ask them if there are any requirements or

suggestions that you might need to follow.

13. A junction box on a piece of European equipment is marked 344 cm3. Convert this to cubic inches. (Hint: Is

there a table that lists standard box sizes?) Answer: 200  0.06102 = 12.204 cubic in.


14. Convert 4500 watts to Btu/hour. Answer: 4500  3.4129 = 15.358 Btu/hour


15. You will learn in Chapter 3 that residential lighting loads are based on 3 volt-amperes per ft.2 (33 volt-

amperes per m2). Determine the minimum lighting load required for an area of 186 m2. Do calculations for

both feet squared and meters squared so you can see the difference in answers. To convert meters squared

to feet squared, refer to Table 1-8.


Answer: Step 1: Convert square meters to square feet

186  10.764 = 2002 sq. ft

Step 2: 2002  3 = 6006 volts-amperes

Working in metrics, the answer is

186  33 = 6138 volt-amperes

, Note: This is an excellent example of what happens when converting inch-pound units to metrics, or vice

versa. You can see that the NEC decided to “round-off”

3 volt-amperes per sq. ft to 33 volt-amperes per square meter. The result is different answers. Not a big

difference, but different nevertheless. Converting a rounded-off inch-pound number to metrics always

results in a fractional metric value. Converting a rounded-off metric number to inch-pound units always

results in a fractional

inch-pound value.

There is no easy way to resolve this issue. Just follow the values as found in the NEC. No doubt inch-

pound measurements will be used in this country for quite a while, so use the inch-pound values until such

time that more information becomes available as on how to handle conversions in the NEC.

See Tables 1-6, 1-7 and 1-8 in Electrical Wiring Residential.

There is also a comprehensive inch-pound/metric conversion table in Appendix D of Electrical Wiring

Residential. Refer to it often.

16. What federal organization dictates requirements for work-related safety issues? (Select the correct answer.)

a. NEC

b. OSHA

c. IAEI

Answer: b. OSHA

17. What can you do to reduce or eliminate the possibility of receiving an electric shock when working on
electrical circuits? (Select the correct answer.)

a. Turn off the power on the circuit you are working on.

b. Turn off the power on the circuit you are working on, tag it, and lock the disconnect in the OFF
position, and verify the absence of voltage on the circuit.

c. Turn off the power on the circuit you are working on, then tell everyone else working with you not to
turn the power back on.

Answer: b. Turn off the power on the circuit you are working on, tag it, and lock the disconnect in
the OFF position.

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