Electrical Wiring Residential
18th Edition
ISBN: 9781285170954
Author: Ray C. Mullin, Phil Simmons
Publisher: Cengage Learning
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Chapter 27, Problem 38R
To determine
Choose correct answer regarding the condition for rebars when they are used as the concrete-encased electrode.
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This discussion relates to Bonding. Whys is bonding of the conduit necessary when using reducing bushings to properly match a conduit to the size hole? Be sure and cite the code reference to back up your answer.
QUESTION 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 B
Suppose the current in this circuit is I = -35 A. The voltage drop across each circuit element is as given in the table below. From this information, determine, for each of these circuit elements,
(i) whether an active or passive sign convention is being used for that element,
(ii) whether that element is absorbing or producing a net (positive) amount of electrical power.
In each answer box within the table below, type the correct choice from among the bold-faced words above.
-
A
A
B
C
A
+
с
B
+ V₂
Circuit element Voltage drop Sign convention? Absorbing or producing net electrical power?
-5 V
-6 V
1 V
-
Chapter 27 Solutions
Electrical Wiring Residential
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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- What assumptions can you make regarding the following receptacle wiring? Check all that apply. White neutral wire Grounding screw Brass screw terminal Silver screw terminal Black hot wire Red hot wire Grounding wires Grounding screw terminal O device is at end-of-run device box does not need a ground connection this is a split-circuit receptacle neutral side receptacle tab must be removedarrow_forwardNeed all detailed information and answers. What are three main reasons to install grounds and bonds on an isolated circuit before work is started? When using protective grounds, does the application of the grounding principle control current or voltage? Does all the current in a grounded conductor take the easiest path to earth? What is the bonding principle? When removing protective grounds on an isolated circuit, which set of grounds is more likely to create an arc, the first set or the second set?arrow_forward1. A14/2 type copper used for a general lighting branch circuit. Ampacity:______________ Maximum Fuse or Circuit Breakers Sizes:________________ 2.Three 8 AWG copper conductors with THHN insulation Installed in garage in electrical metallic tubing (EMT). The ambient temperature in the garage can reach as high as 110'F. All termination points for this circuit are rated 60'C. Ampacity:______________ Maximum Fuse or Circuit Breakers Sizes:________________ 3.Four 4 AWG copper conductor with THWN insulation imstalled in EMT in a basement. All termination points are rated at 60'C. Ampacity:______________ Maximum Fuse or Circuit Breakers Sizes:________________ 4. An 8/3 Type UF copper cable installed underground from a house to a detached garage to feed a 120/240-volt subpanel. All termination points are rated at 60'C.…arrow_forward
- An isolator is used to: Select one: a. To be mounted on towers for insulation purpose b. All of the above c. to disconnect part of the system for maintenance from live circuit d. Insulate the wires to avoid electrocution and short circuits Clear my choicearrow_forwardIf the NEC provides a requirement to grounding equipment, it generally implies that there will be a direct connection to Earth of connection through a/an A. Equipment grounding conductor B. Bonding conductor C. Grounding electrode conductor D. Equipotential bonding conductorarrow_forwardExplain the relevance of earthing and bonding in an electrical Installation.arrow_forward
- Fill in the blank: Electrical hazard boots are made up of highly materials.arrow_forward5. Why isn't solder permitted to be relied on for grounding electrode connections?A. The solder increases the chances of a ground-fault event occurring.B. The heat from the solder weakens the connection and exposes it to physical damage.C. The use of solder doesn't meet the requirements for corrosive influences.D. The connection's integrity can be negatively affected by heat during a ground-fault event.arrow_forwardQ34 Provide answers for the following: a) Differentiate between Planned preventive maintenance and condition based maintenance. b) List the condition monitoring tests used for: i. Circuit breakers ii. iv. Transformers Cables, and Busbars (need two examples for each category).arrow_forward
- 1)Aluminum piping is permitted to be used as a grounding electrode only if other electrodes specified in 250.52(A) are not available for use. a) True b) False 2)The Code requires that more than one grounding electrode be installed to form a system of installed electrodes when none are present. a) True b) Falsearrow_forwardA cone meter rod 2 cm diameter is drawn until its resistance is 100 times the initialresistance. Its length afterward is _________.arrow_forwardElectrical plants Define the terms "Main column ." " Line ." " Protection earth " and " Operating eartharrow_forward
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