Grounding & Bonding
Which of the following is TRUE when installing grounding at more than one building?
The grounded circuit conductor and the equipment grounding conductor must both be extended to the second building.
Which of the following is an NEC® requirement for grounding and bonding?
The path to ground from circuits, equipment, and metal enclosures shall be continuous effective ground fault current path.
A short circuit is a conducting connection between _____.
any of the conductors of an electrical system
The fall-of-potential method is used to measure _______?
earth resistance
A ground FAULT is described as an (UN)INTENTIONAL _____
electrical connection between an (UN)GROUNDED conductor in a circuit and the normal conductors
The key to successfully clearing ground fault currents is _____.
electrical continuity
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
According to the NEC®, the path to ground from circuits, equipment, and metal enclosures must _____.
provide a permanent and continuous path sized to safely conduct potential fault current
A ground tester can be used to measure the value of a grounding electrode's _____.
resistance
When a new grounding system has been installed, it is advisable to conduct baseline three-point tests every _____.
season for the first year
The main bonding jumper is sized based on the size of the _____.
service conductors
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-neutral (grounded) _____.
will vary depending on the distance from the source to the fault
Plate electrodes made of copper must be at least _____.
0.06" thick
How many ungrounded conductors must be taken from the first structure to where the service is located in the second structure when running 120V between buildings?
1
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 transformer-supplied system at less than 50V must be grounded if the supply voltage to the transformer exceeds _____.
150V to ground (Just think 150V = there's a 50 in the question & answer)
A ground ring of 20' of No. 2 bare copper must be buried no less than _____.
2.5' below grade (No. 2 = 2.5 inches — question & answer have 2 in it)
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
Minimum length for driven ground rods under normal conditions is _____.
8'
Which type of system is required to be grounded?
AC systems over 1,000V
Which of the following describes bonding?
Connecting to establish electrical continuity and conductivity
Which is TRUE when 2 or more equipment grounding conductors enter an outlet box?
Grounding conductors connected, then one wire is connected to the grounding terminal on the receptacle. (WTF does that mean?: You need to connect the first grounding conductor to the correct application and after you need to add your bonding conductor to make a correct steady flowing current. Why?: This way you won't overload the neutral bus bar and you won't have all the current flowing into the circuit because it's heading back into the earth)
Which of the following is used to secure equipment grounding conductors to metallic outlet boxes?
Grounding electrode
Which of the following must be connected to the neutral terminal bus of a main distribution panel?
Grounding electrode conductor
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.
Grounding requirements for AC systems are contained in _____.
NEC Sections 250.20 and 250.21
The requirements for grounding of services are located in _____.
NEC Sections 250.24(A), (B), (C), and (D)
Service conductors are sized using _____.
NEC Table 310.16
Which of the following must have at least 2 square feet of surface area exposed to the surrounding earth?
Plate electrode
Metallic noncurrent-carrying parts of an electrical system are bonded together to ensure _____.
Proper operation of overcurrent devices in the event of a ground fault (WTF does this mean? = The electrical system still works bc metallic parts are bonded together. The system will still work bc of overcurrent protection from hot wire touching ground (aka g. fault) )
Which transformer-supplied system must be grounded if the supply voltage to the transformer exceeds 150V?
Systems less than 50V
If single-gang, nail-on, nonmetallic boxes are used with NM cable, which of the following is TRUE regarding grounding conductor connections?
No grounding conductor connection to the box is required.
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
An acceptable grounding electrode is a(n) _____.
metal frame of a building which is effectively grounded
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
The bonding jumper for multiple disconnecting means is located _____.
on the supply side of the service disconnect
A generator system that supplies power where the neutral is NOT CONNECTED to the utility system, such as for carnivals, is known as a(n) _____.
separately derived system (not connected = separate Answer in the question)
System grounding relates to the _____.
service-entrance equipment
A transformer bonding jumper is routed with the feeder conductors from the transformer to the equipment grounding bar in the panel and is known as a(n) _____.
supply-side bonding jumper
In a separately derived system, the equipment bonding jumper connects _____.
system housing to the neutral bus bar
The size of the equipment grounding conductor (ECG) is determined by the size of the _____.
system overcurrent device
Equipment grounding connects metal parts of equipment to the system grounded conductor and/or _____.
the grounding electrode conductor
A ground test utilizing an earth ground resistance tester is known as the _____.
three-point method
A ground test utilizing an auxiliary current electrode and an auxiliary potential electrode is known as the _____.
three-point test
