Grounding and Bonding

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

the grounding electrode conductor

A ground fault is described as an unintentional ________.

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

Which type of system is required to be grounded?

AC system over 1kV that supply mobile or portable equipment

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

150V to ground

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

2.5’ below grade

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

voltage surges

Service conductors are sized using __________.

NEC Table 310.16

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

8’

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 size of the equipment grounding conductor is determined by the size of the ________.

system overcurrent device

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.

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 connections to the box is required.

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

service conductors

The key to successfully clearing ground fault current is _________.

electrical continuity

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

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

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

A transformer bonding jumper is routed with eh feeder conductors from the transformer to the equipment grounding bar in the panel and is known as a(n) ______.

supply-side bonding jumper

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

resistance

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

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

earth resistance

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

three-point test

When a new grounding system has been installed, it is advisable to conduct baseline three-point tests every ________.

season for the first year