EBK ELECTRICAL WIRING RESIDENTIAL
19th Edition
ISBN: 9781337516549
Author: Simmons
Publisher: CENGAGE LEARNING - CONSIGNMENT
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Textbook Question
Chapter 25.3, Problem 14R
- a. How many wires are run between the front hall chime and the extension chime in the recreation room? ______
- b. How many wires are required to provide a “hot” low-voltage circuit at the extension chime? ______
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Finding crystallographic direction
Z
pt. 2
head
pt. 1:
៩
Example 2:
pt. 1 x₁ = a, y₁ = b/2, z₁ = 0
pt. 2 x2=-a, y₂ = b,
Z₂ = c
-a-a b-b/2
c-0
a
b c
tail
=> -2, 1/2, 1
Multiplying by 2 to eliminate the fraction
-4,1,2 => [412] where the overbar represents a
negative index
families of directions
Crystallographic planes
Crystallographic planes are denoted by Miller indices.
5b
Algorithm for Miller indices
1. Read off intercepts of plane with axes in
terms of a, b, c
2. Take reciprocals of intercepts
3. Reduce to smallest integer values
4. Enclose in parentheses, no commas.
353
1/3 1/5 1/3
535
(535)
In the cubic system, a plane and a
direction with the same indices are
orthogonal. E.g. [100] direction is
perpendicular to (100) plane.
Correspondingly, [123] direction is
perpendicular to (123) plane.
[2,3,3]
Plane intercepts axes at 3a, 2b, 2c
2
11 1
Reciprocal numbers are:
3'2'2
b.
Indices of the plane (Miller): (2,3,3)
2
a
Indices of the direction: [2,3,3]
X
(200)
(100)
(110)
(111)
(100)
Indices of crystallographic plane can be found from cross product of indices of
any two non-parallel directions in this plane.
Chapter 25 Solutions
EBK ELECTRICAL WIRING RESIDENTIAL
Ch. 25.1 - How many television outlets are installed in this...Ch. 25.1 - Which type of television cable is commonly used...Ch. 25.1 - What determines the design of the faceplates used?...Ch. 25.1 - Prob. 4RCh. 25.1 - From a cost standpoint, which system is more...Ch. 25.1 - Prob. 6RCh. 25.1 - Prob. 7RCh. 25.1 - Prob. 8RCh. 25.1 - Which article of the Code references the...Ch. 25.1 - It is generally understood that grounding and...
Ch. 25.1 - Prob. 11RCh. 25.1 - Prob. 12RCh. 25.1 - Which section of the Code prohibits supporting...Ch. 25.1 - When hooking up one CATV cable and another cable...Ch. 25.1 - Prob. 15RCh. 25.1 - Prob. 16RCh. 25.2 - How many locations are provided for telephones in...Ch. 25.2 - At what height are the telephone outlets in this...Ch. 25.2 - Sketch the symbol for a telephone outlet.Ch. 25.2 - Is the telephone system regulated by the NEC?...Ch. 25.2 - a. Who is to furnish the outlet boxes required at...Ch. 25.2 - Who is to furnish the telephones? _____Ch. 25.2 - Who does the actual installation of the telephone...Ch. 25.2 - How are the telephone cables concealed in this...Ch. 25.2 - Prob. 9RCh. 25.2 - What are the colors contained in a four-conductor...Ch. 25.2 - Itemize the code rule for the installation of...Ch. 25.2 - If finger contact were made between the red...Ch. 25.2 - What section of the Code prohibits supporting...Ch. 25.2 - The term cross-talk is used to define the hearing...Ch. 25.2 - Which section of the Code prohibits telephone...Ch. 25.3 - Prob. 1RCh. 25.3 - What style of chime is used in this residence?...Ch. 25.3 - a. How many solenoids are contained in a 2-tone...Ch. 25.3 - Explain briefly how two notes are sounded by...Ch. 25.3 - a. Sketch the symbol for a push button....Ch. 25.3 - Prob. 6RCh. 25.3 - What is the maximum volt-ampere rating of...Ch. 25.3 - What two types of chime transformers for Class 2...Ch. 25.3 - Is the extension chime connected with the front...Ch. 25.3 - a. What change in equipment may be necessary when...Ch. 25.3 - What type of insulation is usually found on...Ch. 25.3 - Prob. 13RCh. 25.3 - a. How many wires are run between the front hall...Ch. 25.3 - Why is it recommended that the low-voltage...Ch. 25.3 - a. Is it permissible to install low-voltage Class...Ch. 25.3 - a. Where is the transformer in the residence...Ch. 25.3 - a. How many feet of 2-conductor bell wire cable...Ch. 25.3 - Prob. 19RCh. 25.3 - Prob. 20RCh. 25.3 - What section of the Code prohibits supporting fire...Ch. 25.3 - Prob. 22RCh. 25.3 - What does the term Wi-Fi stand for? _____Ch. 25.3 - A Wi-Fi system is (required) (optional). (Circle...
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