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Grounding and Bonding CML
Grounding and Bonding CML
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1
Equipment grounding conductors perform all but which of the following functions?
Normal current-carrying conductor functions
Bonding functions
Serving as an effective ground-fault current path
Grounding functions
2
A three-phase, 4wire delta with one phase with a higher voltage to ground than the other two phase conductors to ground.
3 phase corner grounded
high-leg delta
3 phase ungrounded
off balanced grounded
3
Building footings, foundations, and various underground systems are are ? to the construction process.
necessary
indidental
essential
inherent
4
Fences located in or surrounding a substation shall be grounded and bonded to limit all of the following except
ground-fault currents
step voltages
touch voltages
transfer voltages
5
Connectors used for a grounding electrode installed in direct contact with the Earth is required to be listed for ?
Direct burial
Concrete encasement
Bonding only
Copper to steel
6
The equipment grounding conductor of nonmetallic sheathed cable is required to be which of the following?
Covered
Any of the above
Insulated
Bare
7
What is the maximum size grounding electrode conductor required for a solidly grounded DC photovoltaic system?
The maximum size provided in 250.166
The maximum size provided in Table 250.102(C)(1)
Not smaller than the largest ungrounded conductor of the DC system
The maximum size required by Table 250.122BackNext Question
8
Multiple separately derived systems that are connected in parallel are considered ? system(s).
separate
non-separately derived
multiple individual separately derived
a single separately derived
9
The grounding electrode conductor installed for a communications system must meet all but which of the following:
It must be listed.
It must be installed without a splice or joint.
It must be kept as short as practicable.
It must be run in as straight a line as practicable.
10
Grounding communications equipment and systems accomplishes which of the following?
Provides a level of shock protection
Limits damage from voltage surges created by line surge
All of the above
Limits damage from voltage surges created by lightning
11
A ? system is a system over 1,000 volts that is solidly grounded at only one point.
multi-grounded neutral
source grounded
resistance grounded
single-point grounded neutral
12
FMC is permitted as a bonding means in lengths not exceeding ? for conductive parts of a neon sign secondary circuit.
10'
6'
25'
100'
13
The primary purpose(s) of medium- and high-voltage shielding are to ? .
confine the voltage stresses to the insulation
carry the ground-fault current in the event of a fault
dissipate leakage current and drain off the capacitive charging current
all of the above
14
A 240-volt, single-phase, 2-wire system is ? grounded.
restricted from being
not required to be
not permitted to be
required to be
15
If a single electrode has a resistance to ground of not greater than ? then a supplement electrode is not required.
10 ohms
25 ohms
1 ohm
50 ohms
16
A connection shall be made between the equipment grounding conductor(s) and a metal box by any of the following except ?
a sheet metal screw
other equipment or device listed for grounding
a listed grounding clip
a grounding screw that shall be used for no other purpose
17
All metallic shields are required to be directly connected to which of the following?
A grounding electrode or a grounding electrode conductor
An equipment grounding conductor
A grounding busbar
Any of the above
18
The building or structure ? shall be used to ground a separately derived system that is required to be grounded.
first system overcurrent protective device
grounding electrode system
quipment grounding conductor
system bonding jumper
19
Which wiring methods is not suitable for use in a 30A branch circuit serving a patient care space of a hospital?
Electrical metallic tubing
Flexible metal conduit
Intermediate metal conduit
Rigid metal conduit
20
Current on a grounding conductor during abnormal events such as ground faults, is ? due to the ? impedance of Earth
low/low
high/low
low/high
high/high
21
MV cable ? provides a means to distribute voltage stresses and drain it to ground at termination points of the cable.
splicing
bonding
shielding
terminations
22
The ground detection sensing equipment for ungrounded systems is required to be connected at which of locations?
At the first system overcurrent protective device enclosure
As close as practicable to where the system receives its supply
At the feeder level distribution equipment
At any convenient point on the system
23
A branch circuit supplying an isolated grounding receptacle installed in a Category 2 space shall ?
Have insulation that is green
Have insulation that is grey
Have insulation that is white
Have green insulation with one or more yellow stripes
24
Where a separate building or structure is supplied by a feeder, all grounding electrodes ? must be bonded together.
on the property
present at the building or structure served
including auxiliary electrodes
available
25
The grounding impedance device must be installed in ?
with the GEC and neutral point of the system source.
parallel
a series parallel connection
series
a separate enclosure
26
Feeder circuit in a parallel raceway, any wire-type equipment grounding conductor is required to be installed in ?
each raceway
one of the raceways
the shortest raceway
any of the raceways
27
Which of the following is not a performance requirement for a grounding electrode conductor?
To establish a connection from a grounded system to a grounding electrode
To stabilize voltage to ground on grounded systems
To serve as an effective ground-fault current path
To serve as a grounding connection to Earth
28
A 120/240-volt, single-phase, 3-wire system is ? grounded.
not required to be
required to be
permitted to be
restricted from being
29
A premises wiring system must include a(n) ? in addition to the ungrounded service conductors.
grounded service conductor
ungrounded phase conductor
ground detection system
equipment grounding conductor
30
The Earth is not permitted to serve as a(n) ? .
path for ground fault current
reference and connection for system grounding
effective ground-fault current path
location for grounding electrodes
31
The requirements for ?
have increased over the years and have resulted in reduced shock and electrocutions.
ground-fault circuit interrupters
short-circuit current protection
arc-fault circuit interrupter protection
ground-fault protection of equipment
32
Ground-fault circuit interrupter protection is available in which of the following types?
GFCI circuit breakers
All of the above
Portable cord sets and portable plug-in devices
Outlet devices
33
Which
standard provides information related to methods that can minimize
hazards from ignition by static discharge?
NFPA 780: Standard for the Installation of Lightning Protection Systems
NFPA 77: Recommended Practice on Static Electricity
NFPA 70: National Electrical Code®
All of the above
