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The definition of service entrance.
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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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Chapter 7 Solutions
Residential Construction Academy: House Wiring (MindTap Course List)
- a. Determine the effective area for the case shown in the figure below. Suppose that l = 4 in. For L5 x 5 x 5/8: Ay = 5.90 in.², = 1.47 in. L5 × 5 × 58 Weld (Express your answer to three significant figures.) A₂ = 6.25 in.2 b. Determine the effective area for the case shown in the figure below. Suppose that = 4 in. PL38 x 4 Weld (Express your answer to three significant figures.) A₁ = in.2 c. Determine the effective area for the case shown in the figure below. PL³/8 x 5 Weld (Express your answer to three significant figures.) in, 2 A₁ = d. Determine the effective area for the case shown in the figure below. PL/2 × 51/2 оо 3/4-in.-diam. bolts (Express your answer to three significant figures.) A₂ = in.2 e. Determine the effective area for the case shown in figure below. PL³½ x 6 7/8-in.-diam. bolts (Express your answer to three significant figures.) Ae in.2arrow_forwardAn American Standard Channel shape must resist a factored tensile load. The length is 15 ft, and there will be two lines of 7/8-in. diameter bolts in the web, as shown in the figure below. Estimate the shear lag factor U to be 0.85. (In a practical design, once the member and bolt layout are selected, the value of U could be computed and the member design could be revised if necessary.) Use A36 steel. For the steel Fy = 36 ksi and F₁ = 58 ksi. Try the tension members given in the table below. Tension member A, (in.²) tw (in.) ry (in.) C10 x 20 5.87 0.379 0.690 C3 × 6 1.76 0.356 0.413 C6 × 8.2 2.39 0.200 0.536 C5 × 9 2.64 0.325 0.486 Bolt lines Select an American Standard Channel shape to resist a factored tensile load of 120 kips. A) C10 × 20 B) C3 × 6 C) C6 x 8.2 D) C5 x 9 -Select- V What is the required gross area? (Express your answer to three significant figures.) Ag = in.2 What is the required effective area? (Express your answer to three significant figures.) Ae = in.2 What is…arrow_forwardIt proposed to provide pile foundation for a heavy column; the pile group consisting of 4 piles, placed at 2.0 m centre to centre, forming a square pattern. The under-ground soil is clay, having Cu at surface as 60 kN/m², and at depth 10 m, as 100 kN/m². Compute the allowable column load on the pile cap with factor of safety of 3.0, if the piles are circular having diameters 0.5 m each and length as 10 m.arrow_forward
- A 12 m long and 300 mm diameter concrete pile is driven in a uniform deposit of sand (p = 36°). The water table is very much down and is not likely to rise in future. The average dry unit weight of sand is 18 kN/m². Calculate the safe load capacity of the pile with factor of safety of 2.5. (use K-1.5 and 8=0.75 q). If the allowable load is increased by 20% what will be the length of the pile.arrow_forwardQ9;Find the invert level for each pipe and the manhole type From to Dmm Lm S Invert Invert in out MH1 MH2 250 110 0.003 MH2 MH3 250 120 0.003 MH3 MH4 250 125 0.003 MH5 MH6 250 80 0.003 MH6 MH4 250 100 0.003 MH4 MH7 300 120 0.0025 GL MH MH depth type 888888arrow_forwardQ8; Check the sewer pipe size sewer lines From to 9 D S V full Q full q/Q d/D (x103) mm m/sec m3/sec full m3/sec MH1 MH2 1.38 250 0.003 MH2 MH3 2.77 250 0.003 MH3 MH4 4.3 250- 0.003 MH5 MH6 0.41 250 0.003 MH6 MH4 4.81 250 0.003 MH4 MH7 9.81 250 0.003arrow_forward
- An engineer is designing a fountain, as shown, and will install a nozzle that can produce a vertical jet. How high (h) will the water in the fountain rise if Vn=26 m/s at h=0?arrow_forwardQ1 A city has a population of 100000. In this city, there are; • 5schools, each of 400 student capacity. • 2hotel of 300 guest capacity. • One hospital of 500 bed capacity in which the number of employees is 200. •Theatre 400 seat Estimate the average, maximum, peak and minimum sanitary sewage flowrates of the city. Type of establishment Unit Typical Iter/day/unit Shopping center Airports m² 4 Passenger 15 Theatre Seat 10 Office Person 50 School Student 60 Hotel Guest 190 Bed 1000 Hospital Employee 40 4.5 4 3.5 3 1 10 100 1000 Population in thosandarrow_forwardThe storm sewer system shown below receives storm water from five subareas (A, B, C, D, E,F and G). For each subarea; the drainage area, the longest flow path length, the slope of ground surface and runoff coefficient are as given in Table I. Estimate storm water flowrate received by each of the four inlets. Assume the area is dense residential area. The diameters and lengths of sewer given in table Sewer line Diameter Length (m) From To (mm) I1 13 300 136 12 13 300 110 13 14 400 120 zone Area (m²) L Slope Runoff (m) of ground surface coefficient A 8000 75.8 0.01 0.8 B 12000 127.3 0.0081 0.7 C 12000 121.2 0.012 0.4 D 20000 194 0.01 0.6 E 20000 200 0.01 0.6 F 22000 220 0.01 0.6 G 21000 215 0.01 0.6 B A E w 12 13 F 14 Plan layoutarrow_forward
- 11.6 The motion of a particle is defined by the relation x = 2t3 - 15t² + 24t4, where x is expressed in meters and t in seconds. Deter- mine (a) when the velocity is zero, (b) the position and the total distance traveled when the acceleration is zero.arrow_forwardRatio of depth to diameter d/D Q3 -A sanitary sewer is used to carry 0.12m³/sec when flowing full and conditions о 1.0 Values of fu 1.1 1.2 1.3 0.9 0.8 Manning's n 0.7 0.6 0.5 0.4 0.3 0.2 0.1 Discharge Velocity Hydraulic properties of cicular sewers 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 Hydraulic elements and full such as minimum flow velocity must be applied. Determine the commercial pipe size that must be used and the gradearrow_forwardFor the tower shown in Figure (2), check the suitability of the proposed piled foundation with the following infiormation: (minimum safety factor against failure is (2). (neglect the group action), (V - 2250 kN, including pile cap weight) and (M 4500 kN.m), the pile group consists of one central the distributed and eight piles circumference of a (6 m) diameter circle ( 45 ) degrees appart}. pile on = 1 m 8 m diameter cap 20 m Figure (2) 10 m M 0.5 m diameter bored pile -30 kPa. y= 19 kN/m² Gs-2,7 Sand Clayarrow_forward
- Residential Construction Academy: House Wiring (M...Civil EngineeringISBN:9781337402415Author:Gregory W FletcherPublisher:Cengage Learning
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