Residential Construction Academy: House Wiring (MindTap Course List)
4th Edition
ISBN: 9781285852225
Author: Gregory W Fletcher
Publisher: Cengage Learning
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Chapter 7, Problem 15RQ
To determine
The minimum burial depth for underground service entrance cable serving a dwelling unit as per Table 300.5 of the NEC.
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4 - kindly identify the correct answer, thanks!
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Chapter 7 Solutions
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- Describe the support requirements for service entrance cable. (Objective 7-3)arrow_forwardModular Questions M7-1 DIFFERENTIAL LEVELING. Preparing and complete the differential level notes for the information shown in the accompanying figure. Include the customary arithmetic check. Levellng Rod Leveling Rod 3.90 (BS) HI4 0.35 (FS) BM 0.68 HI BS) 3.75 (FS) HIz 3.73 (BS) 1.64 (FS) H2 3.52 SP. 0.98 BM. (Elev 125.45m) (BS) (FS) TP TP2 M7-2 PROFILE LEVELING. Figure shows a schematic arrangement of a profile level route from BM33 to BM34. The values indicated represent backsight, foresight, and intermediate foresight readings taken on stations along the route. Prepare and complete profile level notes for the portrayed information. Show the customary arithmetic check and plot the profile. 2+00 1+ 00 3.06 (FS) IFS 03+00 1.7 IFS) 3.43 (FS) TP, 4+40 6+ 00 HI, 22 5+00 8+00 2.8 IFS) HIz 2.45 (FS) BM, M33 BM. "34 Elev 328.7Om 9+00 Il+00 10+00 M7-3 TRIGONOMETRIC LEVELING. A vertical angle of -12°25' is measured to the top of a water tank from an instrument set up on a hill 585.00 meters…arrow_forwardplease answer 8.4arrow_forward
- Which one of the following leveling equipment is most commonly used in the modern days? a. Dumpy level O b. Cross staff O C. Auto level O d. GPSarrow_forwardAI -4m B CI E 4 m + 4m 4 m Darrow_forwardC. Leveling Rod L₁ FS Leveling Rod - BS BM, HI, TP₁ Elev. of TP, Leveling Rod Horizontal Line of Sight BS + Difference in Elev. between BM and BM₂ Elev of BM, (known) (Do not copy the illustration or drawing) Table: Determination of Elevation STATION BS HI FS ELEVATION BM1 1.60 m 100 m TP1 1.47m 0.85 TP2 1.67 m 0.78 TP3 1.54 m 0.89 BM2 0.75 COMPUTATIONS: 1. Computing Height of Instrument and Elevation. In differential leveling, the following two (2) equations are repeatedly used a.) HI Elev + BS b.) Elev=HI-FS Where: HI = height of instrument above a reference datum (MSL) BS = backsight reading on the rod (or plus sights) FS = foresight reading on the rod (or minus sights) ELEV elevation above datum of a point sighted FS BM₂ Elev. of BM₂arrow_forward
- Plot BMD & SFD for the following diagramarrow_forwardIf Type SER service entrance cable is used by an electrician to feed a subpanel from a main panel, the cable must be secured within _________of the panel enclosures and at Intervals not exceeding___________. Name the NEC section that states this requirement. (Objective 8-7)arrow_forwardAlthough it is not a specific requirement, most electricians feel that the best place to start a cable run for a branch circuit is at the service panel or subpanel. Explain why this is so. (Objective 11-3)arrow_forward
- Find the Ray and Rby. Thanksarrow_forwardSelect all true statements. In underground development blasting ...1-long delays between holes should be used in the cut area to reduce vibrationsand ensure smooth blasting2-detonating cord rings can be used to connect detonators within a delay sector3-the angle of breakage should be as large as possible to ensure each hole as freebreakage4-one or more larger blast holes charged with explosives are used in the cut areato breakout the central cutarrow_forwardDIFFERENTIAL LEVELING. The accompanying schematic arrangement of lines portray a differentiallevel route. The values indicated represent backsight and foresight readings taken at different points aslabelled. Prepare and complete level notes for the information shown and perform the customaryarithmetic check.arrow_forward
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