3rd Year- Grounding and Bonding

40問 • 11ヶ月前

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問題一覧

The requirements for identification of equipment grounding conductors are provided in which NEC section?

Section 250.119

The first point of grounding and bonding for a premise wiring system usually occurs at which location?

Within the service equipment

The __ installed for a separately derived system is required to remain within the enclosure where it originates

System bonding jumper

The earth is not permitted to serve as an?

effective ground-fault current path

If an electrical system is grounded __ conductors of the system is connected to earth

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

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)

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

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

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

Electrical systems are grounded to accomplish all but which of the following performance objectives?

Facilities overcurrent protective device operation

Which part of article 250 contains the specific perspective requirements for bonding

Part V

Which of the following is not recognized by the NEC as an equipment grounding conductor

Flexible metallic tubing in a 10’ continuous length

When installing a feeder circuit in a parallel raceway arrangement any wire type equipment grounding conductor is required to be installed in?

each raceway*

When installing a feeder circuit in a parallel raceway arrangement any wire type equipment grounding conductor is required to be installed in __?

Each raceway*

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

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

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

Which of the following is not permitted as identification means for grounded conductors installed at a service

The color Green

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

The grounding electrode conductor for a service can be made at which of the following accessible locations?

Any of the above locations*

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

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

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)

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

A supply side bonding jumper is typically installed in which one of the following locations

Service equipment

Grounding electrodes and the grounding electrode system are covered in __ of Article 250

Part III

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)

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

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*

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

The NEC requires metal water piping systems to be bonded to which of the following

Any of the above

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

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

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

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

Alternating current systems of less than 50V are required to be grounded under which of the following conditions

Any of the above

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*

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

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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29問 • 13日前

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問題一覧

The requirements for identification of equipment grounding conductors are provided in which NEC section?

Section 250.119

The first point of grounding and bonding for a premise wiring system usually occurs at which location?

Within the service equipment

The __ installed for a separately derived system is required to remain within the enclosure where it originates

System bonding jumper

The earth is not permitted to serve as an?

effective ground-fault current path

If an electrical system is grounded __ conductors of the system is connected to earth

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

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)

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

3/0 AWG

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

Electrical systems are grounded to accomplish all but which of the following performance objectives?

Facilities overcurrent protective device operation

Which part of article 250 contains the specific perspective requirements for bonding

Part V

Which of the following is not recognized by the NEC as an equipment grounding conductor

Flexible metallic tubing in a 10’ continuous length

When installing a feeder circuit in a parallel raceway arrangement any wire type equipment grounding conductor is required to be installed in?

each raceway*

When installing a feeder circuit in a parallel raceway arrangement any wire type equipment grounding conductor is required to be installed in __?

Each raceway*

8AWG

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

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

Which of the following is not permitted as identification means for grounded conductors installed at a service

The color Green

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

The grounding electrode conductor for a service can be made at which of the following accessible locations?

Any of the above locations*

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

8AWG

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

A supply side bonding jumper is typically installed in which one of the following locations

Service equipment

Grounding electrodes and the grounding electrode system are covered in __ of Article 250

Part III

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)

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

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*

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

The NEC requires metal water piping systems to be bonded to which of the following

Any of the above

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

2 AWG

corrosion protection

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

Alternating current systems of less than 50V are required to be grounded under which of the following conditions

Any of the above

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*

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

What is the maximum size grounding electrode conductor required for a solidly grounded DC photovoltaic system

The Maximum size provided in table 250.66