Grounding and Bonding (26209-20)

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

A ground fault is described as an unintentional _____.

electrically conducting connection between an ungrounded conductor in a circuit and the normally noncurrent-carrying conductors

A ground ring consisting of 20' of No. 2 bare copper must be buried no less than _____.

2.5' below grade

A ground test utilizing an auxiliary current electrode and an auxiliary potential electrode is known as the _____.

three-point test

A ground tester can be used to measure the value of a grounding electrode's _____.

resistance

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

A transformer-supplied system operating at less than 50V must be grounded if the supply voltage to the transformer exceeds _____.

150V to ground

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

Equipment grounding refers to connecting the normally noncurrent-carrying metal parts of equipment to the system grounded conductor and/or _____.

the grounding electrode conductor

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

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.

Service conductors are sized using _____.

NEC Table 310.16

The bonding jumper for multiple disconnecting means is located _____.

on the supply side of the service disconnect

The fall-of-potential method is used to measure _____.

earth resistance

The key to successfully clearing ground fault currents is _____.

electrical continuity

The main bonding jumper is sized based on the size of the _____.

service conductors

The metallic noncurrent-carrying parts of an electrical system are bonded together to ensure _____.

the proper operation of overcurrent devices in the event of a ground fault

The minimum length allowed for driven ground rods under normal conditions is _____.

8'

The size of the equipment grounding conductor is determined by the size of the _____.

system overcurrent device

To be effective, a grounding system must limit the voltage on the electrical system and protect it from _____.

voltage surges

When a new grounding system has been installed, it is advisable to conduct baseline threepoint tests every _____.

season for the first year

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.

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 TRUE when two or more equipment grounding conductors enter an outlet box?

The grounding conductors are first connected using an approved method, then one wire is connected to the grounding terminal on the receptacle.

Which type of system is required to be grounded?

AC systems over 1kV that supply mobile or portable equipment