Residential Construction Academy: House Wiring (MindTap Course List)
4th Edition
ISBN: 9781285852225
Author: Gregory W Fletcher
Publisher: Cengage Learning
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Chapter 8, Problem 8RQ
To determine
The two types of electrical conduit which are suitable as a service entrance mast.
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1. A 150 X 90 X 12 mm angular
section is welded to a gusset
plate shown.
Area of angular section is 2376
sq.mm.
Fu = 550 MPa
Allowable shear Fv=0.30FU
Fy = 250 MPa
Allowable tensile stress Ft =
0.60FY
a. Determine the force P
b. Determine the total length of
weld using 12mm fillet weld
c. Determine the value of a
d. Determine the value of b
Chapter 8 Solutions
Residential Construction Academy: House Wiring (MindTap Course List)
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- Small-appliance branch circuits and laundry branch circuits installed in a dwelling must have a rating of at least__________ amperes. This information is found in NEC Section __________. (Objective 6-2)arrow_forwardThe most often used category-rated UTP cable for voice and data wiring from various outlets back to the service center or other distribution device in a residential application is______. (Objective 16-3)arrow_forwardExplain the difference between new-work and old-work electrical boxes. (Objective 10-1)arrow_forward
- Calculate the minimum copper conductor size needed for a 120/240-volt electric range branch circuit. The electric range has a nameplate rating of 12 kW. Show all work. (Objective 6-2)arrow_forwardThe minimum amount of free conductor required at an electrical box used in residential wiring for termination purposes is______________ inches. As long as the box has no dimension Larger than 8 Inches (200 mm), there must be at Least ______ inches of free conductor extending out from the box opening. Name the NEC section that covers this wiring practice. (Objective 9-3)arrow_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_forward
- Name and describe three cable types that can be used in residential electrical installations. (Objective 2-5)arrow_forwardA wall-mounted luminaire (fixture) weighing not more than_________ pounds is permitted to be supported on a device box provided the luminaire or its supporting yoke is secured to the box with no fewer than two 6-32 or Larger screws. Name the NEC section that covers this requirement. (Objective 9-5)arrow_forwardName the ampacity for the following copper conductors according to Table 310.15(B) (16): (Objective 6-4) a. 10 AWG THW amps _____ amps b. 8 AWG THWN amps_______ amps c. 1 AWG THHN amps ______ amps d. 4/0 TW amps ______ ampsarrow_forward
- Although 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_forwardDescribe when three-way switches would be used in a residential Lighting circuit. (Objective 2-8)arrow_forwardDescribe the purpose of an LB conduit body used in a residential service entrance Installation that uses electrical conduit. (Objective 8-1)arrow_forward
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