2330 Level 2 Unit 205 Installation (Buildings And Structures)

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    Portable power tools should be inspected 

    • When being serviced
    • Before and after use
    • After being repaired
    • Every three months
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2330 Level 2 Unit 205 Installation (Buildings And Structures) - Quiz
About This Quiz

2330 Level 2 Unit 205 Installation (buildings and structures)
Inspection, testing and certification
Revision Examination (30 questions from a bank) UPDATED TO BS7671:2008

Quiz Preview

  • 2. 

    Dangerous waste materials produced when terminating optical cables should be 

    • Ignored and left in situ

    • Taken off site and placed in suitable containers

    • Left on site with instructions for disposal

    • Thrown outside buildings

    Correct Answer
    A. Taken off site and placed in suitable containers
    Explanation
    When terminating optical cables, it is important to handle the dangerous waste materials properly. Ignoring and leaving them in situ can lead to environmental contamination and potential harm to individuals. Leaving them on site with instructions for disposal may not ensure proper handling and disposal. Throwing them outside buildings is irresponsible and can pose risks to public health and safety. Therefore, the correct answer is to take the waste materials off site and place them in suitable containers to ensure proper containment and disposal.

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  • 3. 

    Circuits used to measure and control temperature, air flow, and humidity in a building are called 

    • Emergency management circuits

    • Environmental control circuits

    • Power control circuits

    • Security control circuits

    Correct Answer
    A. Environmental control circuits
    Explanation
    Environmental control circuits are circuits used to measure and control temperature, air flow, and humidity in a building. These circuits are responsible for maintaining a comfortable and safe environment by adjusting the heating, cooling, and ventilation systems. They play a crucial role in ensuring optimal conditions for occupants and can also contribute to energy efficiency by regulating the usage of HVAC systems.

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  • 4. 

    Before commencing work on a site a contracting electrician should identify 

    • Hazards and personal protective equipment required

    • The site manager’s office

    • The location of the canteen and dinning facilities

    • The name and telephone number of the client.

    Correct Answer
    A. Hazards and personal protective equipment required
    Explanation
    Before starting work on a site, a contracting electrician should identify hazards and the personal protective equipment required. This is important for the safety of the electrician and others working on the site. By identifying hazards, the electrician can take necessary precautions to prevent accidents or injuries. Additionally, knowing the personal protective equipment required enables the electrician to wear the appropriate gear to protect themselves from potential hazards. This ensures a safe working environment and minimizes the risk of accidents.

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  • 5. 

    When working on electrical equipment the supply should be 

    • Isolated and locked in the off position

    • Left connected and treated with care

    • Short circuited to ensure it is not live

    • Switched off using stop buttons

    Correct Answer
    A. Isolated and locked in the off position
    Explanation
    http://www.tlc-direct.co.uk/Book/8.1.1.htm
    The person who carries out the test and inspection must be competent to do so, and must be able to ensure his own safety, as well as that of others in the vicinity. It follows that he must be skilled and have experience of the type of installation to be inspected and tested so that there will be no accidents during the process to people, to livestock, or to property. The Regulations do not define the term 'competent', but it should be taken to mean a qualified electrician or electrical engineer.

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  • 6. 

    After cutting and threading conduit, burrs should be removed using a 

    • Spanner

    • Knife

    • Reamer

    • Pair of pliers

    Correct Answer
    A. Reamer
    Explanation
    After cutting and threading conduit, burrs should be removed using a reamer. A reamer is a tool specifically designed to remove burrs and smooth the edges of a hole or conduit. It helps ensure that the conduit is clean and free from any sharp edges that could potentially cause injury or damage to wires or cables that pass through it. Using a reamer is the most effective and appropriate tool for this task.

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  • 7. 

    When using metal trunking as a circuit protective conductor, continuity is maintained at all joints by 

    • Fitting copper continuity straps

    • Brazing the joints

    • Removing the paint from the trunking

    • Drilling and fitting extra fixing screws.

    Correct Answer
    A. Fitting copper continuity straps
    Explanation
    When using metal trunking as a circuit protective conductor, continuity is maintained at all joints by fitting copper continuity straps. Copper continuity straps are used to ensure a continuous electrical connection between different sections of the trunking. They are typically installed at each joint to provide a low-resistance path for the flow of electricity, preventing any interruption or break in the circuit. This helps to maintain the overall integrity and effectiveness of the circuit protective conductor system.

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  • 8. 

    An electrical contractor drawing up a list of materials and equipment required to complete an installation will need access to 

    • Delivery records

    • Drawings and specifications

    • Circuit diagrams

    • Day work sheets

    Correct Answer
    A. Drawings and specifications
    Explanation
    Working Drawings and Building RegsBuilding Control is the local authority service that is responsible for administrating and enforcing the Building Regulations. The Building Regulation's minimum technical requirements are explained by a series of government issued approved documents which cover the safe structure of buildings, fire safety, hygiene, drainage and waste disposal, efficient use of fuel and power, access to buildings and the installation of windows and doors, as well as other controlled fittings and works. We will design a fully detailed Building regulations drawing to the specification required by the authorities.

    Working drawings and written specifications give the opportunity to the client to tailor their proposed work, this can include floor finishes, types of window frames, the position of power sockets.

    We are here to advise on all aspects, after your design is finalised the specification and working drawings are ready for our builders to work from, or ready to be sent to tender to a builder of your choice. http://www.homedesignconsultants.co.uk/servicescontent-WorkingDrawings.php

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  • 9. 

    Spring toggles and screws are used when fixing electrical equipment to

    • Wooden floors

    • Concrete ceilings

    • Brick walls

    • Hollow walls

    Correct Answer
    A. Hollow walls
    Explanation
    Spring toggles and screws are commonly used when fixing electrical equipment to hollow walls. Hollow walls are typically made of drywall or plasterboard, which are not strong enough to support heavy objects on their own. Spring toggles provide additional support by expanding behind the wall surface, creating a secure anchor point. The screws are then used to attach the electrical equipment to the spring toggles, ensuring a sturdy and reliable installation.

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  • 10. 

    Armoured cables must be supported at regular intervals as specified in BS 7671 in order to 

    • Reduce vibration in cables

    • Improve the appearance of installations

    • Increase air circulation round cables

    • Reduce stress on cables

    Correct Answer
    A. Reduce stress on cables
    Explanation
    Armoured cables are designed to provide protection to the internal conductors from external factors such as physical damage and moisture. These cables are often heavy and rigid, which can create stress on the cables if they are not properly supported. By supporting the cables at regular intervals, the stress on the cables is reduced, preventing potential damage and ensuring their long-term performance and reliability.

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  • 11. 

    Specific guidance is given to the selection of cable sizes, isolation and switching, and inspection and testing for electrical installations in  

    • The Health and Safety at Work Act

    • the Electricity at Work Regulations

    • The Electricity Supply Regulations

    • The IEE Wiring Regulations.

    Correct Answer
    A. The IEE Wiring Regulations.
    Explanation
    British Standard BS7671 (also known as the IEE Wiring Regulations – 17th Edition) gives the requirements for electrical installations; the requirements for joints and terminations are contained in Section 526. The performance of mechanical and compression joints is the subject of BS EN 61238 (or BS 4579 for old joints); the tensile strength of such joints is specified as a percentage of that of the cables which are being joined. http://www.hse.gov.uk/lau/lacs/18-1.htm

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  • 12. 

    BSEN numbers on electrical equipment signifies compliance with 

    • International standards

    • European standards

    • English standards

    • Insulation standards.

    Correct Answer
    A. European standards
    Explanation
    BS EN Standard
    European technical standard as adopted in the UK. BS EN standards often supersede pre-existent national technical standards BS (British Standards).

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  • 13. 

    When calculations show that the voltage drop between the supply terminals and a heating load will exceed 5% of the supply voltage the action to be taken is to 

    • Limit the time the load is connected

    • Increase the supply voltage using a transformer

    • Increase the size of the cable supplying the load

    • Connect the load at off peak times only

    Correct Answer
    A. Increase the size of the cable supplying the load
    Explanation
    Cable Types:

    Twin & Earth or Three Core & Earth
    House wiring cable
    Conductor temperature 70°C
    S.W.A XLPE ( TLC - Standard SWA )
    SWA with XLPE thermosetting insulation giving an increased current carrying capacity.
    Conductor temperature 90°C
    S.W.A PVC
    S.W.A with standard PVC insulation.
    Conductor temperature 70°C
    Hituf
    PVC insulated with Tough PVC thermosetting insulation giving an increased current carrying capacity.
    Suitable for building sites and some garden and other tough conditions.
    Conductor temperature 70°C
    Applications

    Method 100 - Above a plasterboard ceiling with less than 100mm insulation
    Installation methods for flat twin and earth cable clipped direct to a wooden joist above a plasterboard ceiling with a minimum U value of 0.1W/m K and with thermal insulation not exceeding 100 mm in thickness
    Method 101 - Above a plasterboard ceiling with more than 100mm insulation
    Installation methods for flat twin and earth cable clipped direct to a wooden joist above a plasterboard ceiling with a minimum U value of 0.1 W/m K and with thermal insulation exceeding 100 mm in thickness
    Method 102 - In an insulated stud wall with the cable touching the plasterboard
    Installation methods for flat twin and earth cable in a stud wall with thermal insulation with a minimum U value of 0.1 W/m K with the cable touching the inner wall surface
    Method 103 - In an insulated stud wall with the cable NOT touching the plasterboard
    Installation methods for flat twin and earth cable in a stud wall with thermal insulation with a minimum U value of 0.1 W/m K with the cable not touching the inner wall surface
    In conduit in an insulated wall (including Thermalite)
    Clipped direct to a wall
    Wherever practical, a cable is to be fixed in a position such that it will not be covered with thermal insulation
    Notes:

    When cables are grouped or bunched, any cables carrying less than 30% of the load may be ignored for the purpose of obtaining the rating for the rest of the group.
    Where accurate calculations are required please refer to the IEE 17th Edition regulations.
    Examples

    An immersion heater rated at 240 V, 3 kW is to be installed using twin and earth cable. The circuit will be fed from a 16A MCB over 14m in a roof space which is insulated with glass fibre.The roof space temperature is expected to rise to 50°C in summer.

    A. Where it leaves the consumer unit and passes through a 50 mm insulation-filled cavity,the cable will be bunched with seven others.
    Required Cable Size: 10mm
    This adds considerably to the costs and would make it difficult to terminate such a large cable in the accessories. A more sensible option would be to look for a method of reducing the required cable size.

    B. Eight cables leave the consumer unit in two bunches of four
    Result: 6mm

    D. To attempt to make the cable size smaller, if the eight cables left the consumer unit in four bunches of two
    Result: 4mm

    C. If it were possible to run the cable out on its own then no grouping factor would apply.
    Result: 2.5mm

    E. Finally, if the cable left the consumer unit on its own and the cable was not in contact with the glass fibre and clipped direct to the rafters in the loft space.
    Result: 1.5mm http://www.tlc-direct.co.uk/Technical/Charts/VoltageDrop.html

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  • 14. 

    Exploded views in manufactures manuals are generally used to show 

    • Complex components with many parts

    • Large machine parts

    • Wiring diagrams of machines

    • Machines having few parts

    Correct Answer
    A. Complex components with many parts
    Explanation
    Engineering can be a very broad term. It stems from the Latin ingenerare, meaning "to create".Because this could apply to everything that humans create, it is given a narrower definition in the context of technical drawing. Engineering drawings generally deal with mechanical engineered items, such as manufactured parts and equipment.

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  • 15. 

    To check the ongoing progress of a contract, the contracts manager would use 

    • Work sheets and time sheets

    • Operation and data sheets

    • Delivery records and reports

    • Operation sheets and memorandum

    Correct Answer
    A. Work sheets and time sheets
    Explanation
    The contracts manager would use work sheets and time sheets to check the ongoing progress of a contract. Work sheets provide a detailed breakdown of the tasks and activities completed, allowing the manager to track the completion of different stages of the contract. Time sheets, on the other hand, record the amount of time spent on each task, helping the manager monitor the efficiency and productivity of the team working on the contract. By analyzing both work sheets and time sheets, the contracts manager can ensure that the project is on track and identify any potential issues or delays.

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  • 16. 

    Where portable equipment is used out of doors, it must be protected by a 

    • BS 3036 fuse

    • Cartridge fuse

    • Residual current device

    • BS EN 60898 circuit breaker

    Correct Answer
    A. Residual current device
    Explanation
    Why do we need residual current devices?

    {5.3} has stressed that the standard method of protection is to make sure that an earth fault results in a fault current high enough to operate the protective device quickly so that fatal shock is prevented. However, there are cases where the impedance of the earth-fault loop, or the impedance of the fault itself, are too high to enable enough fault current to flow. In such a case, either:

    1. - current will continue to flow to earth, perhaps generating enough heat to start a fire, or

    2. - metalwork which is open to touch may be at a high potential relative to earth, resulting in severe shock danger.

    Either or both of these possibilities can be removed by the installation of a residual current device (RCD). http://www.tlc-direct.co.uk/Book/5.9.1.htm

    In recent years there has been an enormous increase in the use of initials for residual current devices of all kinds

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  • 17. 

    A drawing measuring 2m x 1m representing a site measuring 2km x 1km will be drawn to a scale of 

    • 1 : 500

    • 1 : 1000

    • 1000 : 1

    • 500 : 1

    Correct Answer
    A. 1 : 1000
    Explanation
    Drawing to Scale

    The whole idea behind creating scale drawings is to allow the drafter to create a drawing which is proportionately the same as the artifact it represents. Using a measuring device called a scale, we can create accurate drawings of both very large objects or very small objects and fit either on a standard size piece of paper.

    2:1
    Pronounced "Two to One"
    DOUBLE SIZE :2 millimeters on paper =1 millimeter on the artifact
    The drawing is twice as large as the artifact.

    1:1
    Pronounced "One to One"
    FULL SIZE: 1 millimeter on paper =1 millimeter on the artifact
    The drawing is the exact same size as the artifact.

    1:2
    Pronounced "One to Two"
    HALF SIZE : 1 millimeter on paper =2 millimeters on the artifact
    The drawing is half the size of the artifact.

    1:4
    Pronounced "One to Four"
    QUARTER SIZE or 1 millimeter on paper= 4 millimeters on the drawing.
    The drawing is one quarter the size of the artifact. http://www.archaeologica.org/Drawing%20to%20Scale.htm

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  • 18. 

    Inspection bends, elbows and sleeves should be used on long conduit runs to provide a means of 

    • Reducing stress on cables when drawing them in

    • Improving the appearance of the installation

    • Reducing vibration in the conduit

    • Inspecting cables after completing the installation

    Correct Answer
    A. Reducing stress on cables when drawing them in
    Explanation
    Inspection bends, elbows, and sleeves are used on long conduit runs to reduce stress on cables when drawing them in. These components help to create smoother bends and turns in the conduit, which minimizes the strain and tension on the cables during the installation process. By reducing stress, the risk of damaging or breaking the cables is decreased, ensuring a successful and safe installation.

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  • 19. 

    Holes in floors and ceilings should be restored with suitable materials and to the original thickness at the completion of an installation in order to 

    • Prevent the spread of fire

    • Secure cables and conduits installed

    • Restore the strength of the building

    • Prevent the loss of heat

    Correct Answer
    A. Prevent the spread of fire
    Explanation
    When there are holes in floors and ceilings, restoring them with suitable materials and to the original thickness can help prevent the spread of fire. By filling the holes, it creates a barrier that can restrict the movement of fire, smoke, and heat through the building. This can help contain the fire to a specific area and prevent it from spreading to other parts of the building, potentially saving lives and minimizing damage.

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  • 20. 

    The TT system of earthing is usually used in 

    • Rural areas

    • Urban areas

    • Domestic installations

    • Industrial installations

    Correct Answer
    A. Rural areas
    Explanation
    TT systems

    This arrangement covers installations not provided with an earth terminal by the Electricity Supply Company. Thus it is the method employed by most (usually rural) installations fed by an overhead supply. Neutral and earth (protective) conductors must be kept quite separate throughout the installation, with the final earth terminal connected to an earth electrode (see {5.5}) by means of an earthing conductor.
    Effective earth connection is sometimes difficult. Because of this, socket outlet circuits must be protected by a residual current device (RCD) with an operating current of 30 mA {5.9}. {Fig 5.4} shows the arrangement of a TT earthing system. http://www.tlc-direct.co.uk/Book/5.2.2.htm

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  • 21. 

    Copper cored data communication cables are made up of pairs of conductors twisted along their length in order to

    • Reduce electrical interference

    • Add strength to the cable

    • Reduce overall cable size

    • Increase the cable current rating

    Correct Answer
    A. Reduce electrical interference
    Explanation
    Copper cored data communication cables are twisted along their length in order to reduce electrical interference. Twisting the pairs of conductors helps to cancel out electromagnetic interference from external sources, such as nearby cables or electrical equipment. This interference can degrade the quality of the signal being transmitted through the cable, so reducing it is crucial for maintaining reliable data communication.

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  • 22. 

    The statutory regulations that set standards which will reduce the risk of electric shock, burns and fire due to the use of electrical systems are 

    • the Electricity at Work Regulations

    • The IEE Wiring Regulations

    • The Personal Protective Equipment Regulations

    • The Health and Safety at Work Act.

    Correct Answer
    A. the Electricity at Work Regulations
    Explanation
    The Electricity at Work Regulations 1989 (EAW Regulations) came into force on 1 April 1990. This circular aims to highlight the key issues on inspection and enforcement for inspectors. It is not comprehensive. http://www.hse.gov.uk/lau/lacs/19-3.htm

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  • 23. 

    To comply with IEE Wiring Regulations the voltage drop on a three phase 400v power circuit should not exceed

    • 5v

    • 10v

    • 30v

    • 20v

    Correct Answer
    A. 20v
    Explanation
    *Max Cable Load referes to the maximum allowable current for the cable used in the configuration given above and will vary considerably under different configurations.

    Caution - for Guidance ONLY
    NO guarantee as to the accuracy of these values is given.
    And they should be checked against some other source.

    Cable Types:

    Twin & Earth or Three Core & Earth
    House wiring cable
    Conductor temperature 70°C
    S.W.A XLPE ( TLC - Standard SWA )
    SWA with XLPE thermosetting insulation giving an increased current carrying capacity.
    Conductor temperature 90°C
    S.W.A PVC
    S.W.A with standard PVC insulation.
    Conductor temperature 70°C
    Hituf
    PVC insulated with Tough PVC thermosetting insulation giving an increased current carrying capacity.
    Suitable for building sites and some garden and other tough conditions.
    Conductor temperature 70°C
    Applications

    Method 100 - Above a plasterboard ceiling with less than 100mm insulation
    Installation methods for flat twin and earth cable clipped direct to a wooden joist above a plasterboard ceiling with a minimum U value of 0.1W/m K and with thermal insulation not exceeding 100 mm in thickness
    Method 101 - Above a plasterboard ceiling with more than 100mm insulation
    Installation methods for flat twin and earth cable clipped direct to a wooden joist above a plasterboard ceiling with a minimum U value of 0.1 W/m K and with thermal insulation exceeding 100 mm in thickness
    Method 102 - In an insulated stud wall with the cable touching the plasterboard
    Installation methods for flat twin and earth cable in a stud wall with thermal insulation with a minimum U value of 0.1 W/m K with the cable touching the inner wall surface
    Method 103 - In an insulated stud wall with the cable NOT touching the plasterboard
    Installation methods for flat twin and earth cable in a stud wall with thermal insulation with a minimum U value of 0.1 W/m K with the cable not touching the inner wall surface
    In conduit in an insulated wall (including Thermalite)
    Clipped direct to a wall
    Wherever practical, a cable is to be fixed in a position such that it will not be covered with thermal insulation
    Notes:

    When cables are grouped or bunched, any cables carrying less than 30% of the load may be ignored for the purpose of obtaining the rating for the rest of the group.
    Where accurate calculations are required please refer to the IEE 17th Edition regulations.
    Examples

    An immersion heater rated at 240 V, 3 kW is to be installed using twin and earth cable. The circuit will be fed from a 16A MCB over 14m in a roof space which is insulated with glass fibre.The roof space temperature is expected to rise to 50°C in summer.

    A. Where it leaves the consumer unit and passes through a 50 mm insulation-filled cavity,the cable will be bunched with seven others.
    Required Cable Size: 10mm
    This adds considerably to the costs and would make it difficult to terminate such a large cable in the accessories. A more sensible option would be to look for a method of reducing the required cable size.

    B. Eight cables leave the consumer unit in two bunches of four
    Result: 6mm

    D. To attempt to make the cable size smaller, if the eight cables left the consumer unit in four bunches of two
    Result: 4mm

    C. If it were possible to run the cable out on its own then no grouping factor would apply.
    Result: 2.5mm

    E. Finally, if the cable left the consumer unit on its own and the cable was not in contact with the glass fibre and clipped direct to the rafters in the loft space.
    Result: 1.5mm

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  • 24. 

    A component designed to disconnect a supply under full load conditions is 

    • A fuse

    • An isolator

    • Detector

    • A switch

    Correct Answer
    A. A switch
    Explanation
    A switch is designed to disconnect a supply under full load conditions. It is a device that can open or close an electrical circuit, allowing or interrupting the flow of electricity. Unlike a fuse, which is a protective device that melts and breaks the circuit when there is an overload or short circuit, a switch can be manually operated to disconnect the supply even when the load is at its maximum. An isolator is also a device used to disconnect a supply, but it is typically used for maintenance purposes and not intended for operation under full load conditions. A detector is a device used to sense or detect certain conditions and does not have the function of disconnecting a supply.

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  • 25. 

    A wiring system allowing easy replacement and addition of cables is 

    • PVC conduit

    • Steel wire armoured cable

    • Mineral insulated cable

    • Metallic cable trunking

    Correct Answer
    A. Metallic cable trunking
    Explanation
    http://en.wikipedia.org/wiki/Electrical_wiring_in_the_United_Kingdom

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  • 26. 

    In situations where there is a risk of an explosion due to the presence of fumes and gases electrical switches and control equipment must be 

    • Remotely controlled

    • Mounted in flame proof enclosures

    • Placed outside the danger zone

    • Connected to a low voltage supply

    Correct Answer
    A. Mounted in flame proof enclosures
    Explanation
    In situations where there is a risk of an explosion due to the presence of fumes and gases, electrical switches and control equipment need to be mounted in flame proof enclosures. This is because flame proof enclosures are designed to contain any potential explosion within the enclosure, preventing it from spreading to the surrounding environment. By mounting the switches and control equipment in flame proof enclosures, the risk of ignition and explosion is minimized, ensuring the safety of the surrounding area.

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  • 27. 

    Isolators used to isolate electrical supplies are designed to operate under 

    • Full load conditions

    • No-load conditions

    • Overload conditions

    • Short circuit conditions

    Correct Answer
    A. No-load conditions
    Explanation
    Isolators used to isolate electrical supplies are designed to operate under no-load conditions. This means that they are intended to be used when there is no current flowing through the circuit. Isolators are used to disconnect electrical equipment from the power source for maintenance or repair purposes, and it is important to ensure that there is no current flowing through the circuit to prevent any accidents or damage to the equipment or personnel. Therefore, isolators are specifically designed to handle no-load conditions safely and effectively.

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  • 28. 

    In an installation where appearance is the most important consideration, the most likely choice of a wiring system will be 

    • Ladder racking

    • Mineral insulated cable

    • Armoured cable

    • Cable tray

    Correct Answer
    A. Mineral insulated cable
    Explanation
    Mineral insulated MICC cable to BSEN60702. Fire resistant cable to BS6387
    Conductor: Plain annealed solid copper
    Insulation: Compressed magnesium oxide (Inorganic)
    Core identification: There is no identifing marks on the conductors.
    Armour/Protection: Plain anealed copper tube sheath (Inorganic)
    Sheat/Jacket: LSZH (Low smoke zero halogen)
    Colour: Red
    Voltage: 300/500v for light duty use
    Operating Temperature: Maximum 250°C (But will operate up to a temperature of 1083°C but this will reduce the life of the cable), minimum bending 0°C
    Applications: Suitable for fire protection applications such as alarm circuits, fire pumps and sprinklers, smoke control systems and emergency power & emergency lighting. Also used in process industries where flamable liquids or gases are present
    Standards: BS60702 Part 1: Mineral insulated cables and their terminations with a rated voltage not exceeding 750V
    BS6387, IEC60331, Categories C, W & Z,

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  • 29. 

    In high rise buildings lightning conductors must be bonded to the 

    • Building girder work

    • Water and gas supplies

    • The installation earth

    • Earthing rod.

    Correct Answer
    A. The installation earth
    Explanation
    Persons and equipment within buildings can be at risk from lightning currents and associated
    voltages which may be conducted into the building as a consequence of a lightning strike to the
    building or associated services. Some equipment (e.g. electronic equipment, including
    computers) is especially susceptible to damage from over voltages in the electricity supply caused
    by lightning and such damage may occur even when the lightning strike is remote from the
    building (e.g. from a surge conducted into the building via the electricity supply).
    Measures should to be taken to protect persons and equipment within buildings from the effects
    of lightning

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  • 30. 

    An earthing system that can only be used in special circumstances and uses a combined neutral and earth conductor in the supply and the installation is the 

    • T N-C system

    • T N-C-S system

    • T N-S system

    • T T system

    Correct Answer
    A. T N-C system
    Explanation
    TN-C system
    this installation is unusual, because combined neutral and earth wiring is used in both the supply and within the installation itself. Where used, the installation will usually be the earthed concentric system, which can only be installed under the special conditions listed in {5.7}. http://www.tlc-direct.co.uk/Book/5.2.5.htm

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  • Mar 15, 2023
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  • Jun 08, 2012
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