SOLUTION MANUAL FOR
Electrical Wiring Industrial 18th Edition Stephen L. Herman, Derrick Atkins
Chapter 1-20 The Answers are Provided on Pages 51 to 148.
[This is Updated Document with Correct Answers]
Updated Date 8/26/2026
CHAPTER 1 REVIEW
All answers should be written in complete sentences, and calculations should be
shown in detail.
1. In a set of construction drawings, where would an electrician find
information about the location and placement of a building?
2. From information on the composite site plan, where is the lowest area on the
site and what is the elevation?
3. What device is generally used to measure length on a plot or building plan?
4. What would be the elevation, at the pole, of the bottom of a trench being dug
to install telephone service using rigid nonmetallic conduit?
5. Which of the methods for measuring ground resistance is used to measure
resistance over a wide area?
6. What is the difference, in SI units, between the lowest and the highest
contours?
,To answer the following questions, examine the composite site plan, the north
and west elevations, the site plan symbols, and the NEC.
7. What is the elevation of the manhole rim where the benchmark is
established?
8. What is the elevation of the first floor of the industrial building?
9. What is the vertical distance from the manhole rim to the first floor of the
industrial building? (Measure in decimal feet.)
10. What is the vertical distance from the manhole rim to the first floor of the
industrial building, measured in feet and inches accurate to 1⁄16 inch?
11. Where is the preferred area for location of the construction trailer? Why did
you choose that area?
12. It was determined that the rigid nonmetallic conduit for the telephone service
could be installed in a trench with a bottom elevation of 743.65 ft. If the
conduit is allowed to rise a distance of 1 ft, how deep is the trench at the
building?
13. Refer to plan E1 on page 2 of the plans. What is the height of the boiler room
floor?
14. A cable containing two insulated conductors and a bare grounding wire is
installed to a lighting standard mounted on a base similar to the one shown in
Figure 1-22. Assume you are the electrician in charge. What instruction
, would you give to a first-year apprentice who will make up the grounding
connection?
15. Why is it necessary to have a good grounding system for the building?
16. What are the three most common methods of determining ground resistance?
17. Explain the difference between a soft metric conversion and a hard metric
conversion.
CHAPTER 2 REVIEW
All answers should be written in complete sentences, and calculations should be
shown in detail.
1. What is the available fault current on the secondary of a three-phase,
225-kVA, 480//208/120-volt transformer with an impedance of 1.8%?
2. What is the maximum standard size fuse permitted for a single-phase
25-kVA transformer with an impedance of 4%, installed in any location,
with a primary voltage of 4160 V?
3. Explain the operation of ground detectors and identify the situation that
would require their use.
, 4. Explain the reasoning for installation of the two meters.
5. Two current coils are installed. What is their function and why was it not
necessary to install three coils?
6. If the secondary is ungrounded (such as that shown in Figure 2-11), what
connections would likely be made to the grounding bus?
7. If the secondary is grounded, what connection(s), in addition to those listed
in problem 6, would be made to the grounding bus?
8. What type of three-phase connection requires only two transformers?
9. An installation requires a capacity of 86 kVA. The utility company intends to
set two transformers as an open delta to supply this installation. What is the
minimum kVA capacity of each transformer?
10. Why do most three-phase transformer connections have at least one side
(primary or secondary) connected in delta?
11. What type of three-phase connection requires overcurrent protection in only
two of the three phases?
Electrical Wiring Industrial 18th Edition Stephen L. Herman, Derrick Atkins
Chapter 1-20 The Answers are Provided on Pages 51 to 148.
[This is Updated Document with Correct Answers]
Updated Date 8/26/2026
CHAPTER 1 REVIEW
All answers should be written in complete sentences, and calculations should be
shown in detail.
1. In a set of construction drawings, where would an electrician find
information about the location and placement of a building?
2. From information on the composite site plan, where is the lowest area on the
site and what is the elevation?
3. What device is generally used to measure length on a plot or building plan?
4. What would be the elevation, at the pole, of the bottom of a trench being dug
to install telephone service using rigid nonmetallic conduit?
5. Which of the methods for measuring ground resistance is used to measure
resistance over a wide area?
6. What is the difference, in SI units, between the lowest and the highest
contours?
,To answer the following questions, examine the composite site plan, the north
and west elevations, the site plan symbols, and the NEC.
7. What is the elevation of the manhole rim where the benchmark is
established?
8. What is the elevation of the first floor of the industrial building?
9. What is the vertical distance from the manhole rim to the first floor of the
industrial building? (Measure in decimal feet.)
10. What is the vertical distance from the manhole rim to the first floor of the
industrial building, measured in feet and inches accurate to 1⁄16 inch?
11. Where is the preferred area for location of the construction trailer? Why did
you choose that area?
12. It was determined that the rigid nonmetallic conduit for the telephone service
could be installed in a trench with a bottom elevation of 743.65 ft. If the
conduit is allowed to rise a distance of 1 ft, how deep is the trench at the
building?
13. Refer to plan E1 on page 2 of the plans. What is the height of the boiler room
floor?
14. A cable containing two insulated conductors and a bare grounding wire is
installed to a lighting standard mounted on a base similar to the one shown in
Figure 1-22. Assume you are the electrician in charge. What instruction
, would you give to a first-year apprentice who will make up the grounding
connection?
15. Why is it necessary to have a good grounding system for the building?
16. What are the three most common methods of determining ground resistance?
17. Explain the difference between a soft metric conversion and a hard metric
conversion.
CHAPTER 2 REVIEW
All answers should be written in complete sentences, and calculations should be
shown in detail.
1. What is the available fault current on the secondary of a three-phase,
225-kVA, 480//208/120-volt transformer with an impedance of 1.8%?
2. What is the maximum standard size fuse permitted for a single-phase
25-kVA transformer with an impedance of 4%, installed in any location,
with a primary voltage of 4160 V?
3. Explain the operation of ground detectors and identify the situation that
would require their use.
, 4. Explain the reasoning for installation of the two meters.
5. Two current coils are installed. What is their function and why was it not
necessary to install three coils?
6. If the secondary is ungrounded (such as that shown in Figure 2-11), what
connections would likely be made to the grounding bus?
7. If the secondary is grounded, what connection(s), in addition to those listed
in problem 6, would be made to the grounding bus?
8. What type of three-phase connection requires only two transformers?
9. An installation requires a capacity of 86 kVA. The utility company intends to
set two transformers as an open delta to supply this installation. What is the
minimum kVA capacity of each transformer?
10. Why do most three-phase transformer connections have at least one side
(primary or secondary) connected in delta?
11. What type of three-phase connection requires overcurrent protection in only
two of the three phases?
