NCCER Electrical Grounding & Bonding 2

Question 1

What is the primary purpose of bonding metallic parts of an electrical system?

Accepted Answer

To ensure electrical continuity and establish a low-impedance path capable of safely conducting fault current

Answer

To increase the impedance of the fault path

Answer

To reduce the voltage available at outlets

Answer

To balance three-phase loads across conductors

Question 2

Where is the main bonding jumper required to be installed in a service?

Accepted Answer

At the service equipment, connecting the grounded conductor to the equipment grounding conductor

Answer

At the first overcurrent device after the meter

Answer

At each branch circuit panelboard throughout the building

Answer

At the utility transformer secondary terminals

Question 3

What is a system bonding jumper, as defined in NEC Article 250?

Accepted Answer

The connection between the grounded circuit conductor and the supply-side EGC at a separately derived system

Answer

A jumper that bonds metal conduits to each other along their run

Answer

A conductor that bonds multiple services together at the service point

Answer

A jumper installed at each outlet box to bond the device to the box

Question 4

Per NEC 250.92, which components at the service entrance are required to be bonded?

Accepted Answer

All metal enclosures, raceways, and equipment enclosing or supporting service conductors

Answer

Only the neutral conductor and the meter enclosure

Answer

Only metallic raceways entering the service equipment

Answer

Only the main disconnect enclosure

Question 5

What is the purpose of an equipment bonding jumper installed around a concentric or eccentric knockout?

Accepted Answer

To maintain equipment grounding conductor continuity across a fitting that may not ensure reliable metal-to-metal contact

Answer

To provide an additional current-carrying path for the circuit conductors

Answer

To reduce the impedance of the phase conductors

Answer

To connect the conduit to the building steel

Question 6

Which NEC article contains the primary requirements for grounding and bonding of electrical systems and equipment?

Accepted Answer

Article 250

Answer

Article 210

Answer

Article 230

Answer

Article 300

Question 7

Using NEC Table 250.66, what is the minimum copper grounding electrode conductor (GEC) size for a 200-ampere service with 2/0 AWG copper service-entrance conductors?

Accepted Answer

4 AWG

Answer

6 AWG

Answer

2 AWG

Answer

1/0 AWG