Grounding and Bonding Quiz
The bonding jumper for multiple disconnecting means is located _____.
on the supply side of the service disconnect
Ultimately, the ground fault is cleared when the _____.
overcurrent devices are opened
A separately derived system is a premises wiring system that is _____.
powered from a source other than a service
System grounding relates to the _____. systems over 250 volts
service-entrance equipment
The size of the equipment grounding conductor (EGC) is determined by the _____.
size of the overcurrent device
In a separately derived system, the equipment bonding jumper connects _____.
system housing to the neutral bus bar
Equipment grounding refers to connecting the normally noncurrent-carrying metal parts of equipment to the system grounded conductor and/or _____.
the grounding electrode conductor
Which of the following must be connected to the neutral terminal bus of a main distribution panel?
the grounding electrode conductor
Which of the following is used to secure equipment grounding conductors to metallic outlet boxes?
Grounding clip
If the neutral in a grounded system is not needed for voltage requirements, it _____.
must be run to the service and connected to the GEC and EGC
An acceptable grounding electrode is a(n) _____.
metal frame of a building which is effectively grounded
Plate electrodes made of copper must be at least _____.
0.06" thick
Where a main bonding jumper is required by the NEC®, the jumper cannot be less than what percentage of the area of the largest phase conductor?
12.5%
A ground ring consisting of 20' of No. 2 bare copper must be buried no less than _____.
2.5' below grade
Rod, pipe, and plate electrodes must have a resistance to ground of at least _____.
25 ohms or less
The minimum diameter of galvanized pipe allowed for a grounding electrode is _____.
3⁄4"
Where there is a requirement to add a second grounding electrode, the two electrodes must be spaced at least ____
6' apart
The minimum length allowed for driven ground rods under normal conditions is _____.
8'
Grounding requirements for AC systems are contained in _____.
<b><i>NEC Sections 250.20 and 250.21</i></b>
The requirements for grounding of services are located in _____.
<b><i>NEC Sections 250.24(A), (B), (C), and (D)</i></b>
Which type of system is required to be grounded?
AC systems over 1,000V that supply mobile or portable equipment
Which of the following describes bonding?
Connecting to establish electric continuity and conductivity
Which of the following is true of the neutral in a grounded system?
It provides a low-impedance return path for the flow of fault current to the source.
If Single-Gang Nail-On non-metallic boxes are used with NM cable, which of the following is true?
No connection to the box is required.
Which of the following must have at least 2 square feet of surface area exposed to the surrounding earth? Pipe electrode
Plate electrode
Which transformer-supplied system must be grounded if the supply voltage to the transformer exceeds 150V?
Systems less than 50V
Which of the following is an NEC® requirement for grounding and bonding?
The path to ground from circuits, equipment, and metal enclosures shall be permanent and continuous.
Which of the following describes a ground fault?
The unintentional, electrically conducting connection between an ungrounded conductor of an electrical circuit and the normally noncurrent-carrying conductors, metallic enclosures, metallic raceways, metallic equipment, or the earth
A short circuit is a conducting connection between _____.
any of the conductors of an electrical system
When a ground rod is installed, the top of the rod must be positioned _____.
below permanent moisture level if practicable
The continuity between service equipment and enclosures is maintained by _____.
bonding
The key to successfully clearing ground fault currents is _____.
electrical continuity
A ground test utilizing an earth ground resistance tester is known as the _____.
three-point method
To be effective, a grounding system must limit the voltage on the electrical system and protect it from _____.
voltage surges
The maximum value of a short circuit current from line-to-ground _____.
will vary depending on the distance from the source to the fault