Residential Construction Academy: House Wiring (MindTap Course List)
4th Edition
ISBN: 9781285852225
Author: Gregory W Fletcher
Publisher: Cengage Learning
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Question
Chapter 7, Problem 1RQ
To determine
The definition of service entrance.
Expert Solution & Answer
Explanation of Solution
The service entrance is one of the most crucial components of a residential electrical system. The service entrance gives the home's electrical system access to the electric utility company's power supply.
The service conductors at an underground service entrance run from the service main disconnect terminals to the point where the underground utility wire is connected.
Several of the requirements for the installation of service entrances are covered by Article 230 of the NEC®. The specifications for grounding a residential service entrance are covered by Article 250 of the NEC®.
The local electric utility must be approached after the kind of service entrance being placed is selected, and the service type, location, and installation must all be planned with them.
Conclusion:
The service entrance gives the home's electrical system access to the electric utility company's power supply.
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Students have asked these similar questions
Problem 1
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=
= 13,600
Manometers can be used in combination with cardiovascular catheters to measure blood
pressure based on height differences. In the example in Figure 1, the manometer
contains two fluids: water (density p 995 Kg/m³) and mercury (density pm
Kg/m³). The density of blood is p 1,060 Kg/m³. Assume that there is atmospheric
pressure at the interface between mercury and air. The interface between mercury and
water is at z₁ = 7 cm, the interface between water and blood is at Z2 27 cm, and the
tip of the manometer at za 10 cm.
Recall that the fluid statics equation is dp/dz-pg 0, when the z axis is taken
pointing downwards.
a. What is the gauge pressure po at the interface with air, in mmHg? (5 points)
b. Calculate the gauge pressure ps at the tip of the manometer, in mmHg. (5
points)
N
Z37
blood
ப
Zz
Water
Mercury
Zo
3=0
z
Figure 1. Manometer for blood pressure measurement.
Determine the following for the beam with unknown loading, using
the Shear and Bending Diagrams provided in the figures on the right:
a. The maximum shear stress experienced by the beam.
b. The maximum flexural stress experienced by the beam (Indicate if
this is tensile or compressive flexural stress)
c. The loading diagram (Indicate the magnitudes of the loading/s. The
loads are acting along the plane of symmetry of the section)
20 80 20
十十
SHEAR DIAGRAM
x=577.3502692 mm
20 KN
1°
5/3 KN
2°
C
2°
D
A
B
CROSS SECTION
Dimensions are in mm
LOADING DIAGRAM
?
120
40
40
A
B
C
D
1000mm
2000mm
1000mm
-55/3 KN
MB'
C
D
BENDING DIAGRAM
MB
A
B
Σ
Mc
Find the maximum bending stress in ksi for this beam if it is made from a W16x50 steel shape. If the steel yields
at 50 ksi, will the beam support the loads shown without permanently deforming? Confirm the max moment in
the beam by drawing the shear and moment diagram.
18 kip-ft
2 kip/ft
9 ft
Chapter 7 Solutions
Residential Construction Academy: House Wiring (MindTap Course List)
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