問題一覧
1
The requirements for identification of equipment grounding conductors are provided in which NEC section?
Section 250.119
2
The first point of grounding and bonding for a premise wiring system usually occurs at which location?
Within the service equipment
3
The __ installed for a separately derived system is required to remain within the enclosure where it originates
System bonding jumper
4
The earth is not permitted to serve as an?
effective ground-fault current path
5
If an electrical system is grounded __ conductors of the system is connected to earth
1*
6
What is the minimum size required for a wire-type aluminum or copper clad aluminum common grounding electrode conductor installed for multiple separately derived system in a building?
250 Kcmil
7
Grounding is the process of establishing a connection to __ or to a conductive body that extends the ground connection
both A and B (earth and ground)
8
Where a separate building or structure is supplied by a feeder all grounding electrodes __ must be bonded together to form the
Grounding electrode system
present at the building or structure served
9
What is the minimum size copper bonding conductor for an interior metal water piping system if the building is supplied by a service that has a large ungrounded service entrance conductor size of 2500 Kcmil
3/0 AWG
10
If the largest ungrounded conductor from a separately derived system total is 750 Kcmil aluminum what is the minimum size required for the required system bonding jumper?
3/0 aluminum or copper clad aluminum
11
Electrical systems are grounded to accomplish all but which of the following performance objectives?
Facilities overcurrent protective device operation
12
Which part of article 250 contains the specific perspective requirements for bonding
Part V
13
Which of the following is not recognized by the NEC as an equipment grounding conductor
Flexible metallic tubing in a 10’ continuous length
14
When installing a feeder circuit in a parallel raceway arrangement any wire type equipment grounding conductor is required to be installed in?
each raceway*
15
When installing a feeder circuit in a parallel raceway arrangement any wire type equipment grounding conductor is required to be installed in __?
Each raceway*
16
If an 80 ampere non time delay fuse is installed as the branch circuit short circuit and ground fault protective device for a 20HP 480V 3 phase motor what is the minimum size required for a copper wire equipment grounding conductor
8AWG
17
The minimum size wire type equipment grounding conductors is based on which of the following
The rating of the overcurrent protective device protecting the circuit
18
A metal underground water pipe qualifies as a grounding electrode in accordance with which of the following
if there is not less than 10’ in direct contact with the earth
19
Which of the following is not permitted as identification means for grounded conductors installed at a service
The color Green
20
Where transfer equipment does not provide a switching action in the __ supplied from a generator the system is already grounded by the interconnected grounded conductors in the transfer equipment
Grounded (neutral) conductor
21
The grounding electrode conductor for a service can be made at which of the following accessible locations?
Any of the above locations*
22
As building footings, foundations l and various underground systems are being installed during construction grounding electrodes are often established because they are __ to the construction process
inherent
23
Where FMC or liquid tight is installed in a hazardous (classified) location and the branch circuit contained in the conduit is protected at 100A what is the minimum size required for a copper wire type bonding jumper installed on the outside of the conduit and terminated at the fitting on each end?
8AWG
24
In patient care spaces of a health care facility where isolated/ insulated equipment grounding circuits are installed with the branch circuits not less than __ ECG paths required to be installed to meet the requirements of 517.13 and 250.146(D)
3
25
If the required grounding electrode conductor for a service is 2/0 AWG copper, what is the minimum size required for a grounded conductor connection has to meet which of the following requirements?
2/0 AWG copper
26
A supply side bonding jumper is typically installed in which one of the following locations
Service equipment
27
Grounding electrodes and the grounding electrode system are covered in __ of Article 250
Part III
28
Which of the following is not a separately derived system
An auto transformer with a grounded conductor common to both the input (primary) and output (secondary)
29
The connector used for grounding electrode installed in direct contact with the earth is required to be listed for which one of the following
Direct burial
30
Where a ground rod is installed as the electrode for a communications system and equipment the grounding electrode connection has to meet which of the following requirements?
any of the above*
31
The code generally requires a __ to be installed from a grounded metal box to the grounding terminal on a ground lung type receptacle
equipment bonding jumper
32
The NEC requires metal water piping systems to be bonded to which of the following
Any of the above
33
Which NEC article contains specific rules related to grounding and bonding requirements for electric signs and light emitting diode (LED) sign illumination systems?
Article 600
34
Where the grounding electrode for a building is metal underground water pipe electrode what is the minimum size copper grounding electrode conductor tap that extended from a common grounding electrode conductor to a service disconnect that is supplied by 250 Kcmil copper service entrance conductors
2 AWG
35
Where a length of reinforcing rod (rebar) is used as a concrete encased electrode rebar extensions that exist from the concrete shall not be permitted to be exposed to the earth without the use of __?
corrosion protection
36
The __ is a conductor used to connect the system grounded conductor or the equipment to a grounding electrode or to a point on the grounding electrode system
grounding electrode conductor
37
Alternating current systems of less than 50V are required to be grounded under which of the following conditions
Any of the above
38
The provision ls of section 250.6 shall not be considered as permitting electronic equipment from being operated on AC systems or branch circuits that are not connected to a __ as required
equipment grounding conductor*
39
Type AC is suitable for branch circuits in patient care spaces of a health care facilities when it meets which of the following construction characteristics
The cable includes an insulated copper equipment grounding conductor
40
What is the maximum size grounding electrode conductor required for a solidly grounded DC photovoltaic system
The Maximum size provided in table 250.66
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問題一覧
1
The requirements for identification of equipment grounding conductors are provided in which NEC section?
Section 250.119
2
The first point of grounding and bonding for a premise wiring system usually occurs at which location?
Within the service equipment
3
The __ installed for a separately derived system is required to remain within the enclosure where it originates
System bonding jumper
4
The earth is not permitted to serve as an?
effective ground-fault current path
5
If an electrical system is grounded __ conductors of the system is connected to earth
1*
6
What is the minimum size required for a wire-type aluminum or copper clad aluminum common grounding electrode conductor installed for multiple separately derived system in a building?
250 Kcmil
7
Grounding is the process of establishing a connection to __ or to a conductive body that extends the ground connection
both A and B (earth and ground)
8
Where a separate building or structure is supplied by a feeder all grounding electrodes __ must be bonded together to form the
Grounding electrode system
present at the building or structure served
9
What is the minimum size copper bonding conductor for an interior metal water piping system if the building is supplied by a service that has a large ungrounded service entrance conductor size of 2500 Kcmil
3/0 AWG
10
If the largest ungrounded conductor from a separately derived system total is 750 Kcmil aluminum what is the minimum size required for the required system bonding jumper?
3/0 aluminum or copper clad aluminum
11
Electrical systems are grounded to accomplish all but which of the following performance objectives?
Facilities overcurrent protective device operation
12
Which part of article 250 contains the specific perspective requirements for bonding
Part V
13
Which of the following is not recognized by the NEC as an equipment grounding conductor
Flexible metallic tubing in a 10’ continuous length
14
When installing a feeder circuit in a parallel raceway arrangement any wire type equipment grounding conductor is required to be installed in?
each raceway*
15
When installing a feeder circuit in a parallel raceway arrangement any wire type equipment grounding conductor is required to be installed in __?
Each raceway*
16
If an 80 ampere non time delay fuse is installed as the branch circuit short circuit and ground fault protective device for a 20HP 480V 3 phase motor what is the minimum size required for a copper wire equipment grounding conductor
8AWG
17
The minimum size wire type equipment grounding conductors is based on which of the following
The rating of the overcurrent protective device protecting the circuit
18
A metal underground water pipe qualifies as a grounding electrode in accordance with which of the following
if there is not less than 10’ in direct contact with the earth
19
Which of the following is not permitted as identification means for grounded conductors installed at a service
The color Green
20
Where transfer equipment does not provide a switching action in the __ supplied from a generator the system is already grounded by the interconnected grounded conductors in the transfer equipment
Grounded (neutral) conductor
21
The grounding electrode conductor for a service can be made at which of the following accessible locations?
Any of the above locations*
22
As building footings, foundations l and various underground systems are being installed during construction grounding electrodes are often established because they are __ to the construction process
inherent
23
Where FMC or liquid tight is installed in a hazardous (classified) location and the branch circuit contained in the conduit is protected at 100A what is the minimum size required for a copper wire type bonding jumper installed on the outside of the conduit and terminated at the fitting on each end?
8AWG
24
In patient care spaces of a health care facility where isolated/ insulated equipment grounding circuits are installed with the branch circuits not less than __ ECG paths required to be installed to meet the requirements of 517.13 and 250.146(D)
3
25
If the required grounding electrode conductor for a service is 2/0 AWG copper, what is the minimum size required for a grounded conductor connection has to meet which of the following requirements?
2/0 AWG copper
26
A supply side bonding jumper is typically installed in which one of the following locations
Service equipment
27
Grounding electrodes and the grounding electrode system are covered in __ of Article 250
Part III
28
Which of the following is not a separately derived system
An auto transformer with a grounded conductor common to both the input (primary) and output (secondary)
29
The connector used for grounding electrode installed in direct contact with the earth is required to be listed for which one of the following
Direct burial
30
Where a ground rod is installed as the electrode for a communications system and equipment the grounding electrode connection has to meet which of the following requirements?
any of the above*
31
The code generally requires a __ to be installed from a grounded metal box to the grounding terminal on a ground lung type receptacle
equipment bonding jumper
32
The NEC requires metal water piping systems to be bonded to which of the following
Any of the above
33
Which NEC article contains specific rules related to grounding and bonding requirements for electric signs and light emitting diode (LED) sign illumination systems?
Article 600
34
Where the grounding electrode for a building is metal underground water pipe electrode what is the minimum size copper grounding electrode conductor tap that extended from a common grounding electrode conductor to a service disconnect that is supplied by 250 Kcmil copper service entrance conductors
2 AWG
35
Where a length of reinforcing rod (rebar) is used as a concrete encased electrode rebar extensions that exist from the concrete shall not be permitted to be exposed to the earth without the use of __?
corrosion protection
36
The __ is a conductor used to connect the system grounded conductor or the equipment to a grounding electrode or to a point on the grounding electrode system
grounding electrode conductor
37
Alternating current systems of less than 50V are required to be grounded under which of the following conditions
Any of the above
38
The provision ls of section 250.6 shall not be considered as permitting electronic equipment from being operated on AC systems or branch circuits that are not connected to a __ as required
equipment grounding conductor*
39
Type AC is suitable for branch circuits in patient care spaces of a health care facilities when it meets which of the following construction characteristics
The cable includes an insulated copper equipment grounding conductor
40
What is the maximum size grounding electrode conductor required for a solidly grounded DC photovoltaic system
The Maximum size provided in table 250.66