Residential Construction Academy: House Wiring (MindTap Course List)
5th Edition
ISBN: 9781337402415
Author: Gregory W Fletcher
Publisher: Cengage Learning
expand_more
expand_more
format_list_bulleted
Concept explainers
Question
Chapter 8, Problem 1RQ
To determine
The description of the purpose of a weatherhead.
Expert Solution & Answer
Explanation of Solution
Weatherhead is the fitting located on the service drop end of the service entrance raceway or service entrance cable. The other name of weatherhead is a service head.
Weatherhead is designed for the reduction of the moisture amount which can access the raceway or cable.
The aim of the weatherhead is to prevent water from entering the end of a service entrance cable. Every service entrance conductor has to exit the weatherhead from a separate hole.
Service raceways at the connection point should be fitted with a weatherhead to overhead service conductors. Service entrance cables should be fitted with a weatherhead specified for use in a place that's wet. Through independently bushed openings in the weatherhead, service entrance conductors should be carried out.
Want to see more full solutions like this?
Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!
Students have asked these similar questions
A distillate fired industrial boiler rated at 60 million BTU/hr uses 2 million gallons per year
of 0.25% sulfur distillate. What are its emissions of nitrogen oxides (NOx), SO2 and
formaldehyde? Emission factors of air pollutants for distillate combustion in an industrial
boiler are given below.
NOX
Pollutant
Emission factor
(lb/103 gallon
20
*
SO2
142S*
PM 10
2
CO
5
VOCs
0.2
Benzene
0.1863
Formaldehyde
1.7261
Cadmium
Chromium(VI)
*S= %S in fuel
0.0015
0.0002
3. Consider a new 1800 MW power plant that burns dry sub-bituminous coal in a PC-wall-fired,
wet bottom furnace with plant efficiency of 39%. Use the emission factors in your lecture
notes to determine the emission rates of all particulates, PM10, SOx, NOx and CO in ton per
year. No gas treatment equipment was installed.
1. The particulate emissions were measured from a factory stack. The stack was divided into
three sectors with different cross-sectional areas. The measured velocities and particulate
concentrations were given below.
Sector
number
1
2
3
Cross-sectional
Stack velocity
area (m²)
(ft/s)
1.0
60
1.2
45
1.4
55
Particulate concentration
(mg/m³)
450
530
610
a) What is the average particulate concentration in mg/m³?
b) What are the particulate emissions per unit area in g/m²-s for sector number 1, 2 and 3?
c) What are the flow rates of particulates in g/s for sector number 1, 2 and 3?
Chapter 8 Solutions
Residential Construction Academy: House Wiring (MindTap Course List)
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, civil-engineering and related others by exploring similar questions and additional content below.Similar questions
- An urban county with an area of 1,000 mile² has an estimated 18 million miles of vehicular traffic per day and has a large power plant. The power plant produces 350 MW of electricity at an efficiency of 39%, burning 10,000 Btu/lb coal. The vehicle emission factor for VOCs is 6 grams/mile; the coal-fired boiler emission factor for VOCs is 1.4 lb/ton coal; biogenic emission of VOCs is 0.4 kg/km²-hr on the average. Determine the total emissions of VOCs in tons/day from all sources (mobile, power plant, and biogenic).arrow_forwardFor automobile, gasoline is a complex mixture of relatively volatile hydrocarbon blended for use in spark-ignition engines. Every time fuel is burned, the carbon is converted to carbon dioxide (CO2), the natural end product of combustion. If we approximate the chemical formula for gasoline by the compound octane (C8H18) with a density of 739 grams/liter, the stoichiometric reaction for complete combustion is: C8H18 + 12.5O2 8CO2 + 9H2O Thus, for every mole of C8H18 fuel that is burned, eight moles of CO2 are produced, along with nine moles of water vapor. Estimate the CO2 emission in grams per mile for a car getting 12 km/liter of gasoline.arrow_forwardThe farming plan of steel structure has 30 ft long simply supported beams spaced at 8 ft apart. The beams carry dead loads (D) and live loads (L). The selected beam size is W 18x50. 1) Based on 0.3Fy allowable stress limit due to dead loads only (D), what will be the maximum D load in psf that can be applied to the beams? Ignore beam weight. 2) Using the D load obtained from Part 1 and based on 0.6Fy allowable stress limit due to combined dead loads and live loads, what will be the maximum live load L in psf that can be applied to the beams? 3) If the maximum mid span deflection due to live loads (L) is L/360 ( or 1.0 in in this case), what will be the maximum L load in psf that can be applied to the beams?arrow_forward
- From two inaccessible but intervisible points A and B, the angles to two triangulation stations C and D were observed as follows: Line AB = 500 m long. Angle CAB = 79 deg 30° Angle DAB = 28 deg 30° Angle DBC = 31 deg 30° Angle DBA = 84 deg 30° Find the distance BC Find the distance BD Find the distance CDarrow_forwardFrom two inaccessible but intervisible points A and B, the angles to two triangulation stations C and D were observed as follows: Line AB is 500 m long. Angle CAB = 79 deg 30° Angle DAB = 28 deg 30° Angle DBC = 31 deg 30° Angle DBA = 84 deg 30° 1. Find the distance BC 2. Find the distance BD 3. Find the distance CDarrow_forwardPlease help, make sure it's to box out and make it clear what answers go where...arrow_forward
- Consider the three cases shown below, in which a soil column is subjected to different water heads (similar set-upDarby’s experiment in the reader). Using the tables provided, establish the pressure, elevation, and total heads ateach location, considering that the datum is:a) at the headwater, andb) at the tailwater.c) What was the effect of assuming a different datum on the i) pressure, ii) elevation, and iii) total heads?d) In the schematic for each case, draw an arrow indicating the direction of water flow inside the soil.e) What is the hydraulic gradient across the soil in each case?f) If the soil permeability and cross-sectional area of the cylinder remains constant across the different cases, whichone leads to the largest flow rate q? Which one has the lowest flow rate?g) What assumptions were necessary for you to answer these questions?arrow_forwardFor given distributed loads, see figures below, determine resultant and moments around load ends (points A and B). Assume p = 2kN/m.arrow_forwardA permeability test apparatus of diameter 82.5 mm contains a column of fine sand 460 mm long. When water flows through it under a constant head at a rate of 191 cm3/minute, the loss of head between two points 250 mm apart is 380 mm. Calculate the coefficient of permeability of the fine sand. If falling head test is made on the same sample using a standpipe of diameter of 30 mm, in what time will the water level in standpipe fall from 1560 mm to 1066 mm above outflow level.arrow_forward
- Computation must be completeFor the given cantilever beam shown in the figure below,a. Draw the shear and moment diagram using service loads.b. Determine the critical design moment using Working Stress Design (Ma) load combinations.c. Draw the shear and moment diagram using factored loads.d. Determine the critical design moment using Strength Design (Mu) load combinations, use NSCP2015.e. For the given cross-section of the beam, give the reason why the reinforcement is at the topportion of the beam section?arrow_forwardLAB: FORCE AND FORCE-RELATED VARIABLES ASSIGNMENT INSTRUCTIONS INSTRUCTIONS Lab assignments are intended to give you some ‘hands on' experience in applying the concepts introduced in the course text. They are designed to get you out of your classroom or office and develop the skills of designing experiments and collecting data, and then performing calculations, evaluating the results, and communicating your findings. Labs are more than just number crunching - they are about reflecting on what is both practical and technically sound engineering problem-solving. For each problem below, address the scenario presented and develop engineering solutions. Communicate your results using drawings, pictures, and discussion, supported by calculations developed using the Microsoft Equation Editor or similar tool. Submit your lab report in a single pdf file uploaded to the location provided in Canvas before the due date/time indicated. Each problem should be treated as a micro-report with a problem…arrow_forwardHow can a construction estimator gain experience to better judge appropriate contingency amounts?arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Residential Construction Academy: House Wiring (M...Civil EngineeringISBN:9781337402415Author:Gregory W FletcherPublisher:Cengage Learning
Residential Construction Academy: House Wiring (M...
Civil Engineering
ISBN:9781337402415
Author:Gregory W Fletcher
Publisher:Cengage Learning