Module 9 review and supplement Questions

Which of the following is used to connect a ground rod with a grounding conductor?

d. A grounding clamp

Item F in the figure represents the___________

d. Main bonding jumper

The maximum distance allowed by the NEC to connect a grounding conductor to a water pipe after the pipe enters the building is________

d. 10'

The conducting connection, whether intentional or accidental, between any of the conductors of an electrical system is known s a_________

d. short circuit

If the loads were only 240V on a single-phase 240V system with a center-tapped transformer, the neutral conductor would carry_______ amperes.

0

Grounding methods include an underground water pipe in direct contact with the earth for no less than ___________.

10'

Systems less than 50V are required to be grounded if the supply voltage to the transformer exceeds__________ to ground.

150V

A short circuit is a conducting connection, whether intentional or accidental, between any of the_______ of an electrical system.

Conductors

Electrical___________ is the key to successful clearing of ground faults.

Continuity

The two types of grounding system are system grounding and ________

Equipment grounding

The neutral conductor is always larger than the ungrounded conductors.

False

While grounding prevents excessive voltage due to lightning or line surges, it does not stabilize voltage during normal operation.

False

A conductor used to connect equipment or the grounded circuit of a wiring system to a grounding electrode is called a(n).

GEC (general electrical conductor)

All receptacles used in residential applications must be of the___________ type.

Grounding

Circuits that cannot be grounded include certain circuits for cranes, electrolytic cells, secondary circuits on lighting systems, and isolated power systems in _________

Hazardous location

The size of the bonding jumper on the supply side is based on the size of the____________ in each raceway.

Largest Phase

Which conductor(s) are grounded on a single-phase, three-wire, 120/240V system

Neutral

The size of the EGC is determined by the__________.

Over current device

The two main purposes of the neutral in a grounded system are to permit utilization of power at line-to-neutral voltage and _________________________

Produce a low-impedance return path for the flow of fault current to the source to facilitate the operation of the over current devices in the circuit.

The size of the grounding electrode conductor is based on the size of the ____________.

Service entrance conductor

The neutral or grounded conductor is a system or circuit conductor that is intentionally grounded.

True

Systems are solidly grounded to limit the __________ during normal operation and to prevent excessive voltages due to lightning and line surges.

Voltage to ground

When a metal water pipe is used as a grounding electrode, what must be provided around the water pipe?

a. Bonding jumpers

Item C in the figure represents the___________

a. Grounded conductor

Which of the following copper AWG sizes should be used for the grounding conductor for a 200A service using 3/0 copper conductors?

a. No. 2

Item B in the figure represents the___________

b. Ungrounded Conductors

All of the following are suitable materials for ground rods except_________

d. 1/2" solid aluminum rod

Which of the following is an NEC violation when used as a grounding electrode?

c. An underground gas line

Item E in the figure represents the___________

c. Grounding electrode Conductors

Residential electrical services are grounded by connecting the grounded conductor to a grounding electrode at the__________

neutral bus in the main panelboard