Electrical Wiring: Residental - With Plans (Paperback) Package
18th Edition
ISBN: 9781305416376
Author: MULLIN
Publisher: Cengage
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Chapter 27, Problem 28R
To determine
Fill in the blank with the appropriate word that indicates about the prevention of air circulation through the conduit.
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QUESTION 8
Enclosures that are not over 100 cubic inches in size and which have two conduits supported within three feet on either side of the enclosure and the enclosure does not contain devices or support fixtures shall not be required to have the enclosure supported if the conduits are _____.
a
installed with locknuts inside and outside enclosure
b
shoulders of fittings outside and locknuts inside the box
c
rigid nonmetallic conduits
d
threaded into hubs identified for the purpose
Practically it is possible the _______________ cables pass through on poles along with high voltage power cables.
Whenever closed conduits are used in a hydroelectric power plant,
is/are used to limit the abnormal pressure in the
conduit.
Chapter 27 Solutions
Electrical Wiring: Residental - With Plans (Paperback) Package
Ch. 27 - Define the Service Point. ______________Ch. 27 - Define service-drop conductors.Ch. 27 - Prob. 3RCh. 27 - a. The service head must be located (above)...Ch. 27 - Prob. 5RCh. 27 - When a conduit is extended through a roof, must it...Ch. 27 - a. What size and type of conductors are installed...Ch. 27 - How and where is the grounding electrode conductor...Ch. 27 - What are the minimum distances or clearances for...Ch. 27 - What are the minimum size ungrounded conductors...
Ch. 27 - What is the minimum size copper grounding...Ch. 27 - What is the recommended height of a meter socket...Ch. 27 - Prob. 13RCh. 27 - Prob. 14RCh. 27 - Prob. 15RCh. 27 - Prob. 16RCh. 27 - Prob. 17RCh. 27 - Prob. 18RCh. 27 - Prob. 19RCh. 27 - Prob. 20RCh. 27 - Prob. 21RCh. 27 - Prob. 22RCh. 27 - Prob. 23RCh. 27 - Prob. 24RCh. 27 - Prob. 25RCh. 27 - Prob. 26RCh. 27 - Prob. 27RCh. 27 - Prob. 28RCh. 27 - Prob. 29RCh. 27 - Prob. 30RCh. 27 - Prob. 31RCh. 27 - Prob. 32RCh. 27 - Prob. 33RCh. 27 - Prob. 34RCh. 27 - Prob. 35RCh. 27 - Prob. 36RCh. 27 - Prob. 37RCh. 27 - Prob. 38RCh. 27 - Prob. 39RCh. 27 - Prob. 40RCh. 27 - Prob. 42RCh. 27 - Prob. 43RCh. 27 - Prob. 44RCh. 27 - Prob. 45RCh. 27 - Prob. 46RCh. 27 - Prob. 47RCh. 27 - Prob. 48R
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- Assuming that an outlet box for the entry ceiling has a fixture stud but has external cable clamps, what size box could be installed? Show calculations for both metal and nonmetallic boxes. ___________arrow_forward___________ is an Area on a device characteristic where the ratio between applied voltage and resulting current is constant.arrow_forwardA switch is also an electrical conductor that serves as a mechanism to conveniently "open or close" a line in the circuit. It should be connected in _______within the circuit line it protects.arrow_forward
- Is it permitted to use flexible metal conduit over 6 ft (1.8 m) in length as a grounding means? (Yes) (No) (Circle the correct answer.)arrow_forwardQUESTION 9 When a ground wire is connected to an interior gas piping system and the underground portion of the gas pipe into the building is plastic, which of the following is (or are) true? a A.This would be approved by code as the gas pipe is only being bonded to the electrical system. b B.This installation would be approved by code, as the gas pipe is not a grounding electrode. c C.Both A and B d D.Neither A nor Barrow_forwardQUESTION 4 Conduits or raceways through which moisture may contact live parts shall be _____ at either or both ends. a. sealed b. bushed c. a or b d. pluggedarrow_forward
- Underground ferrous metal raceways, boxes, and support hardware shall be suitably protected against ______ inside and outside (except threads at joints).arrow_forwardf.1. Since the footing or foundation is generally part of the grounding electrode system, the _______electrode is one of the first electrodes installed.A. metal water pipeB. plateC. concrete-encasedD. ground ringf.2. When you're connecting the grounding electrode conductor to a metal water pipe as it enters a building,the connection must be made within _______ feet of the pipe's entrance to the building.A. 10B. 5C. 15D. 7f.3. Which National Electrical Code table is used for sizing grounding electrode conductors?A. Table 250.102(C)(1)B. Table 250.66C. Table 250.122D. Table 250.118(6)(a)arrow_forwardTo testing installation of grounds, the usual procedure is to connect one lead of the megohmmeter to one of the conductors, then the other lead is___. A, connected to another conductor b, connected to the conduit or raceway c. Connected to a special grounding electrode on the megohmmeter d. Left unconnectedarrow_forward
- Fill in the blank 14. Mechanisms for __________ include switches,sensors,and circuitry.arrow_forwardQuestion 17 The electrode and circuit must provide a flow path to the earth with less than of resistance. 5 10 25 30 Question 18 A(n) is a permanent conductor placed across a water meter to provide a continuous flow path for ground current. shunt bare conductor electrode bonding conductorarrow_forwardTOPIC: Power Systems, Power Plants & IlluminationINSTRUCTIONS:- Answer in this format: Given, Illustration, Required Conversion, Solution, Final Answer.- Step-by-step solution, do not skip even simple calculations to avoid confusion.- If answered in written form, make sure it is readable.PROBLEM:In hazardous locations, the use of non-metallic conduit shall be permitted provided it is buried NOT less than ___________ blow the earth level. 400 mm 600 mm 1000 mm 500 mmarrow_forward
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