What should be obtained before using the lead sheath or other metal covering of a cable as an earth electrode?

Consent of the owner of the cable

Approval from the local government

A permit from the electrical installation board

An environmental impact assessment

According to the regulations, an earth electrode should not consist of what material if it is to be used in water?

Metal not suitable for use as an earth electrode

What is required for an earthing conductor connection to an earth electrode?

It must be electrically and mechanically satisfactory

It must be visible at all times

It should be connected without any protective measures against corrosion

What should be provided in every installation according to Regulation 542.4.1?

A main earthing terminal to connect the following: the circuit protective conductors, the protective bonding conductors, functional earthing conductors (if required), and the lightning protection system bonding conductor (if any)

A main earthing terminal for the lightning protection system only

A main earthing terminal for the functional earthing conductors only

A main earthing terminal for the protective bonding conductors only

According to Regulation 543.1.1, how should the cross-sectional area of every protective conductor, other than a protective bonding conductor, be determined?

Calculated in accordance with Regulation 543.1.3, or selected in accordance with Regulation 543.1.4

Based on the manufacturer's specifications

By using a standard cross-sectional area for all types of conductors

According to the length of the conductor only

Regulation 543.1.2 states that where a protective conductor is common to two or more circuits, its cross-sectional area shall be calculated based on what?

The most onerous of the values of fault current and operating time encountered in each of the various circuits

The average values of fault current and operating time encountered in each of the various circuits

The least values of fault current and operating time encountered in each of the various circuits

The values of fault current and operating time of the circuit with the largest cross-sectional area

Which of the following can be used as a protective conductor?

A fixed bare or insulated conductor

What is the minimum cross-sectional area that a protective conductor of 10 mm² or less should have according to Regulation 543.2.1?

At least equal to that resulting from the application of Regulation 543.1, or verified by test in accordance with the appropriate part of BS EN 61439 series

The same as that resulting from the application of Regulation 543.1

Less than that required by Regulation 543.1

There is no specified minimum cross-sectional area

Under what condition can an extraneous-conductive-part be used as a protective conductor?

When it complies with Regulation 543.2.6

When it is used within a low voltage switchgear assembly

What must a protective conductor be protected against?

Mechanical, chemical, and electrochemical deterioration

Mechanical and chemical deterioration only

Is it permissible to use a PEN conductor as a separate metal enclosure for cable?

No, it should not be used as a PEN conductor

Yes, but only if it complies with Regulation 543.2.6

Yes, but only in trunking systems

According to 543.3.3, which of the following is NOT an exception where a switching device can be inserted in a protective conductor?

A device where the protective conductor circuit shall not be interrupted before the live conductors are reconnected

As permitted by Regulation 537.1.5

A multiple plug-in device where the protective conductor circuit is not interrupted before the live conductors are reconnected

A live conductor is re-established not later than when the live conductors are reconnected

Under what condition can PEN conductors not be used within an installation as per 543.4.1?

If the installation is for consumers' installations except as permitted by Regulation 543.4.2

If the installation is supplied by a private generating plant

If the installation is supplied by the owner without the distributor's network

If the installation requires authorization for use of a PEN conductor

What is the requirement for the outer conductor of a concentric cable according to 543.4.4?

It shall not be common to more than one circuit

It shall be common to more than one circuit

It shall have a cross-sectional area of 6 mm²

It shall be used within an installation without authorization

According to 543.4.5, what should be the conductance of the outer conductor of a concentric cable at a temperature of 20°C?

Not less than that of the internal conductor

Equal to that of the internal conductor

Greater than that of the internal conductor

Half of that of the internal conductor

As per Regulation 543.7.1.203, what is the requirement for a protective conductor in a flexible conduit to provide additional protection against mechanical damage?

It must comply with the requirements of Regulations 543.2 and 543.3.

It must have a cross-sectional area of not less than 10 mm².

It must be enclosed in the same conduit as the power conductors.

According to Regulation 543.7.1.203, what is the requirement for an earth monitoring system to BS 4444?

It must disconnect the supply to the equipment in the event of a continuity fault.

It must have a cross-sectional area of not less than 10 mm².

It must be incorporated in the same conduit as the power conductors.

According to Regulation 543.7.2.01, what should be provided with a high integrity protective conductor connection if the total protective conductor current in normal use will exceed 10 mA?

A separate protective conductor being provided as a ring

A ring final circuit with a ring protective conductor

A radial final circuit with a single protective conductor

A separate protective conductor connected via the final socket-outlet by connection to the metal conduit or ducting

Under what condition is a main protective bonding conductor selected according to the largest PEN conductor of the supply?

When the installation serves more than one building

When the installation serves only one building

When the PEN conductor is less than 35 mm²

When the PEN conductor is over 150 mm²

According to Regulation 544.1.2, where should the main protective bonding connection to any extraneous-conductive-part such as gas, water or other metallic pipework be made?

At the point of entry of that part into the premises

At the consumer's hard metal pipework

Within 600 mm of the meter outlet union if the meter is external

At any convenient point within the building

Under what condition does Regulation 544.2.2 apply to the conductor connecting two extraneous-conductive-parts in compliance with Regulation 544.2.3?

When the conductor is connected to an exposed-conductive-part in compliance with Regulation 544.2.2

When the conductor is of a permanent and reliable nature

When the conductor is provided by a supplementary conductor

When the conductor is connected to an exposed-conductive-part and the cross-sectional area is not less than 2.5 mm² if sheathed or otherwise provided with mechanical protection

What does Regulation 544.2.5 specify as a requirement for supplementary bonding where a conductive part is to be applied to a fixed appliance?

A conductive part of a permanent and reliable nature

A conductive bonding of at least 2.5 mm² cross-sectional area

A conductive bonding of at least 4 mm² cross-sectional area

A conductive bonding is to be applied to a flexible appliance

Electrical Earthing Quiz

Authored by Chris Barlow

Education

12th Grade

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49 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

According to the regulations, every means of earthing and every protective conductor must be selected and erected to satisfy which specific requirements?

The requirements of the manufacturer

The requirements of the local government

The requirements of the Regulations

The requirements of the installation team

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What should be referred to when there is also a lightning protection system in place?

BS EN 62305

BS EN 60364

The local building code

The manufacturer's guidelines

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Earthing arrangements may be used jointly or separately for which purposes according to the text?

Decorative and aesthetic purposes

Protective and functional purposes

Indoor and outdoor purposes

Temporary and permanent purposes

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the requirement for the main earthing terminal in a TN-S system?

It must be connected to the nearest water pipe.

It must be connected to the main switchboard.

It must be connected to the earthed point of the source of energy.

It must be connected to the local grounding grid.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the requirement for a TNC-S system regarding the main earthing terminal?

It must be connected to the distributor's lines and equipment.

It must be connected to an independent grounding system.

It must be connected to the consumer's main distribution board.

It must be connected to the neutral of the source of energy.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What should the design of an earth electrode take into account?

The aesthetic appearance of the installation

The possibility of electrical interference

The increase in resistance due to corrosion

The ease of installation and maintenance

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is NOT recognized as a suitable type of earth electrode according to the regulations?

Earth rods or pipes

Earth tapes or wires

Earth plates

Earth coils

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Electrical Earthing Quiz

According to the regulations, every means of earthing and every protective conductor must be selected and erected to satisfy which specific requirements?

What should be referred to when there is also a lightning protection system in place?

Earthing arrangements may be used jointly or separately for which purposes according to the text?

What is the requirement for the main earthing terminal in a TN-S system?

What is the requirement for a TNC-S system regarding the main earthing terminal?

What should the design of an earth electrode take into account?

Which of the following is NOT recognized as a suitable type of earth electrode according to the regulations?

What should be obtained before using the lead sheath or other metal covering of a cable as an earth electrode?

What is the minimum cross-sectional area of a buried earthing conductor not protected against mechanical damage and not protected against corrosion?

According to the regulations, an earth electrode should not consist of what material if it is to be used in water?

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