Student Workbook With Lab Manual For Fletcher's Residential Construction Academy: House Wiring, 5th
5th Edition
ISBN: 9781337404518
Author: Gregory W Fletcher
Publisher: Cengage Learning
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Chapter 9, Problem 15RQ
To determine
The number of steps required to have a wall switch placed at the top and bottom of the stairway to control interior stairway lighting and the NEC section that covers this wiring situation.
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What are some reasons for why a company would accelerate a construction project?
For the design of a shallow foundation, given the following:
Soil: ' = 20°
c' = 52 kN/m²
Unit weight, y = 15 kN/m³
Modulus of elasticity, E, = 1400 kN/m²
Poisson's ratio, μs = 0.35
Foundation: L=2m
B=1m
Df = 1 m
Calculate the ultimate bearing capacity. Use the equation:
1
-
qu = c' NcFcs Fcd Fcc +qNqFqsFqdFqc + ½√BN√Fãs F√dƑxc
2
For '=20°, Nc = 14.83, N₁ = 6.4, and N₁ = 5.39.
(Enter your answer to three significant figures.)
qu =
kN/m²
A 2.0 m wide strip foundation carries a wall load of 350 kN/m in a clayey soil where
y = 15 kN/m³, c' = 5.0 kN/m² and ' = 23°. The foundation depth is 1.5 m. For ' = 23°:
Nc = 18.05; N₁ = 8.66; Ny
=
=
= 8.20.
Determine the factor of safety using the equation below.
qu= c' NcFcs FcdFci+qNqFqsFq
1
F
+
gd.
'qi
2
·BN√·
FF
γί
Ysyd F
(Enter your answer to three significant figures.)
FS
=
Chapter 9 Solutions
Student Workbook With Lab Manual For Fletcher's Residential Construction Academy: House Wiring, 5th
Ch. 9 - Prob. 1RQCh. 9 - Prob. 2RQCh. 9 - Prob. 3RQCh. 9 - The minimum amount of free conductor required at...Ch. 9 - Prob. 5RQCh. 9 - Describe how an insulated grounded conduct or...Ch. 9 - Describe how a white Insulated conductor in a...Ch. 9 - Prob. 8RQCh. 9 - Describe how a conductor that is larger than 6 AWG...Ch. 9 - Prob. 10RQ
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