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CSCS Self-Erect Crane study materials
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CSCS Self-Erect Crane practice questions

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Question 1Legislation and Standards Applicable to Self-Erect Cranes

Under UK health and safety law, which document must a self-erect crane operator hold to demonstrate that the lifting equipment has been thoroughly examined before first use?

  1. A method statement
  2. A toolbox talk record
  3. A COSHH assessment
  4. A report of thorough examination Correct answer.

Explanation

Lifting equipment must be thoroughly examined before first use and at statutory intervals, and the competent person's findings are recorded in a report of thorough examination. Method statements, COSHH assessments and toolbox talks do not evidence the examination itself.

Question 2Legislation and Standards Applicable to Self-Erect Cranes

Which piece of UK legislation places the primary duty on employers to ensure, so far as is reasonably practicable, the health, safety and welfare of employees?

  1. The Construction (Design and Management) Regulations 2015
  2. The Provision and Use of Work Equipment Regulations 1998
  3. The Lifting Operations and Lifting Equipment Regulations 1998
  4. The Health and Safety at Work etc. Act 1974 Correct answer.

Explanation

The Health and Safety at Work etc. Act 1974 establishes the overarching general duties, including the employer's duty to employees so far as is reasonably practicable. The other instruments impose more specific duties within that framework.

Question 3Legislation and Standards Applicable to Self-Erect Cranes

Under LOLER 1998, what is the maximum interval between thorough examinations of lifting accessories such as slings and shackles?

  1. Thirty-six months
  2. Twelve months
  3. Six months Correct answer.
  4. Twenty-four months

Explanation

LOLER requires lifting accessories to be thoroughly examined at least every six months, reflecting their higher wear and handling exposure. Lifting equipment generally is examined at least every twelve months unless an examination scheme specifies otherwise.

Question 4Legislation and Standards Applicable to Self-Erect Cranes

A self-erect crane is being installed on a site. Which regulation set requires the lifting operation to be properly planned by a competent person, appropriately supervised and carried out safely?

  1. COSHH 2002
  2. PPE at Work Regulations 2022
  3. RIDDOR 2013
  4. LOLER 1998 Correct answer.

Explanation

LOLER 1998 requires every lifting operation to be planned by a competent person, appropriately supervised and carried out in a safe manner. The other instruments concern substances, incident reporting and personal protective equipment respectively.

Question 5Legislation and Standards Applicable to Self-Erect Cranes

Which body produces the Approved Code of Practice and guidance supporting the Lifting Operations and Lifting Equipment Regulations?

  1. The Health and Safety Executive Correct answer.
  2. The British Standards Institution
  3. The Construction Industry Training Board
  4. The Environment Agency

Explanation

The Health and Safety Executive publishes the Approved Code of Practice and guidance for LOLER, giving practical interpretation of the regulatory duties. BSI publishes standards, CITB provides training, and the Environment Agency regulates environmental matters.

Question 6Legislation and Standards Applicable to Self-Erect Cranes

What does the CE or UKCA marking on a self-erect crane primarily indicate?

  1. That the crane is exempt from LOLER requirements
  2. That the equipment conforms with the applicable product supply legislation Correct answer.
  3. That the crane has passed its six-monthly thorough examination
  4. That the operator has been trained to a recognised standard

Explanation

CE and UKCA markings are declarations of conformity with the relevant product supply legislation, made by the manufacturer before placing equipment on the market. They are unrelated to in-service examination, operator competence or regulatory exemptions.

Question 7Legislation and Standards Applicable to Self-Erect Cranes

Which regulation requires employers to report certain dangerous occurrences, including the collapse or overturning of lifting machinery, to the enforcing authority?

  1. RIDDOR 2013 Correct answer.
  2. PUWER 1998
  3. CDM 2015
  4. LOLER 1998

Explanation

RIDDOR 2013 sets out the reporting requirements for specified incidents, including the collapse or overturning of lifting machinery. CDM, LOLER and PUWER impose other duties but do not establish the incident reporting regime.

Question 8Legislation and Standards Applicable to Self-Erect Cranes

A self-erect crane is to be sited close to an overhead power line. Which document should be consulted first to establish the required clearance and any permission-to-work controls?

  1. The site waste management plan
  2. The plant maintenance schedule
  3. The crane manufacturer's manual and the electricity supplier's guidance Correct answer.
  4. The COSHH register

Explanation

The manufacturer's manual gives the crane's operating envelope and clearances, and the electricity supplier's guidance sets out safe distances and permission-to-work arrangements near lines. Waste, COSHH and maintenance records do not address electrical clearance.

Question 9Legislation and Standards Applicable to Self-Erect Cranes

Under PUWER 1998, what must be done before a self-erect crane is first used by workers on site?

  1. It must be suitable for the intended use and accompanied by adequate information and, where appropriate, training Correct answer.
  2. It must be repainted in a high-visibility colour
  3. It must be fitted with a reversing alarm regardless of type
  4. It must be registered with the local authority

Explanation

PUWER requires work equipment to be suitable for its intended use, with adequate information, instruction and training provided, and appropriate maintenance arrangements in place. Colour schemes, universal reversing alarms and local authority registration are not PUWER first-use requirements.

Question 10Legislation and Standards Applicable to Self-Erect Cranes

A self-erect crane has been erected by the operator. Which person must carry out the pre-use inspection and record the findings before the crane is brought into service?

  1. The principal designer
  2. Any site visitor
  3. The crane hire company's accounts manager
  4. A competent person appointed for the purpose Correct answer.

Explanation

LOLER requires lifting equipment to be inspected by a competent person at the appropriate times, including after installation and before first use, with the findings recorded. Visitors, finance staff and designers are not competent persons for this purpose.

Question 11Legislation and Standards Applicable to Self-Erect Cranes

Where a self-erect crane is used as a suspended personnel platform, which additional regulation applies to the work at height aspects of the operation?

  1. The Manual Handling Operations Regulations 1992
  2. The Work at Height Regulations 2005 Correct answer.
  3. The Noise Regulations 2005
  4. The Control of Asbestos Regulations 2012

Explanation

The Work at Height Regulations 2005 apply to all work at height and impose hierarchy, planning and rescue duties that overlay the lifting requirements. The other regulations address asbestos, noise and manual handling respectively.

Question 12Legislation and Standards Applicable to Self-Erect Cranes

A crane hire company supplies a self-erect crane with a rated capacity limiter. Which legal requirement is most directly satisfied by that device?

  1. The duty to consult employees
  2. The duty to display the site safety sign
  3. The duty to ensure lifting equipment is of adequate strength and stability for the load Correct answer.
  4. The duty to report dangerous occurrences

Explanation

LOLER and PUWER require lifting equipment to be of adequate strength and stability, with protection against exceeding safe working limits. A rated capacity limiter directly supports that requirement rather than reporting, signage or consultation duties.

Question 13Legislation and Standards Applicable to Self-Erect Cranes

What does the term 'competent person' mean when applied to the thorough examination of a self-erect crane?

  1. The most senior manager on the project
  2. The crane operator on duty
  3. A person with the necessary knowledge, training and experience to carry out the examination Correct answer.
  4. Any person holding a valid site induction card

Explanation

A competent person has the necessary knowledge, training and experience, and where relevant the independence, to perform the examination properly. Site induction, seniority and operator status do not by themselves confer that competence.

Question 14Legislation and Standards Applicable to Self-Erect Cranes

A self-erect crane is being installed on a construction project subject to CDM 2015. Who has the duty to ensure that the lifting operation is coordinated with other work on site?

  1. The local planning authority
  2. The crane manufacturer
  3. The principal contractor Correct answer.
  4. The equipment insurer

Explanation

Under CDM 2015 the principal contractor has responsibility for managing and coordinating health and safety during the construction phase, including interface with lifting operations. Manufacturers, planners and insurers have no such site coordination duty.

Question 15Legislation and Standards Applicable to Self-Erect Cranes

Which document should specify the crane's configuration, load chart limits, ground bearing requirements and exclusion zones for a particular self-erect crane installation?

  1. The lifting plan Correct answer.
  2. The fire risk assessment
  3. The COSHH assessment
  4. The site induction register

Explanation

The lifting plan records the planning of the operation, including configuration, load chart limits, ground conditions and exclusion zones, as required by LOLER. The other documents address substances, fire and induction respectively.

Question 16Legislation and Standards Applicable to Self-Erect Cranes

Under LOLER, when must lifting equipment that is exposed to conditions causing deterioration be thoroughly examined?

  1. Only when the equipment changes ownership
  2. Only at the end of the project
  3. At intervals specified in an examination scheme, which may be more frequent than the statutory maximum Correct answer.
  4. Only after a reported defect

Explanation

Where deterioration could occur, LOLER requires thorough examination at intervals specified in an examination scheme drawn up by a competent person, which may be shorter than the statutory defaults. Defects, ownership changes and project completion are not the trigger for routine examination.

Question 17Legislation and Standards Applicable to Self-Erect Cranes

A self-erect crane's report of thorough examination lists a defect that is not a danger to persons. What action is required?

  1. The defect must be recorded and the equipment kept under review so the defect is remedied in a timely manner Correct answer.
  2. The report may be discarded
  3. The equipment must be destroyed immediately
  4. No action is required at all

Explanation

Where an examination identifies a defect that is not a danger, it is recorded in the report and the equipment may continue in use while the defect is monitored and remedied within a suitable timescale. Destruction, inaction and discarding the report are not appropriate responses.

Question 18Legislation and Standards Applicable to Self-Erect Cranes

Which of the following best describes the purpose of the Provision and Use of Work Equipment Regulations 1998 in relation to a self-erect crane?

  1. To require the crane to be tested by the manufacturer annually
  2. To prescribe the colour of crane counterweights
  3. To set the maximum wind speed for crane operation
  4. To require that the equipment is suitable, maintained and used only by trained people Correct answer.

Explanation

PUWER requires work equipment to be suitable for use, maintained in an efficient state, and used only by people who have received adequate information, instruction and training. It does not set wind limits, prescribe colours or mandate annual manufacturer testing.

Question 19Legislation and Standards Applicable to Self-Erect Cranes

An operator is asked to erect a self-erect crane on ground of uncertain bearing capacity. Which legal principle most directly requires the ground conditions to be assessed before erection?

  1. The requirement to display the site safety sign
  2. The requirement to consult employees on welfare facilities
  3. The requirement to report accidents
  4. The requirement for lifting equipment to be stable and installed in accordance with the manufacturer's instructions Correct answer.

Explanation

LOLER and PUWER require lifting equipment to be stable and used in accordance with the manufacturer's information, which includes foundation and ground bearing requirements for self-erect cranes. Signage, welfare consultation and accident reporting do not address ground stability.

Question 20Legislation and Standards Applicable to Self-Erect Cranes

A self-erect crane is fitted with a manufacturer's load moment indicator. Under the supply and use framework, what is the operator's legal responsibility regarding that device?

  1. To recalibrate it personally before each lift
  2. To disconnect it if it slows the work
  3. To record its readings in the accident book
  4. To ensure it is functioning and not to rely on it as a substitute for the load chart and planning Correct answer.

Explanation

Safety devices must be maintained and used, but they supplement rather than replace the planned lift, the load chart and the operator's judgement. Operators are not expected to recalibrate devices, disable them, or log readings in the accident book.

Question 21Legislation and Standards Applicable to Self-Erect Cranes

Which statement correctly describes the relationship between the HSE Approved Code of Practice for LOLER and the Regulations themselves?

  1. The Code applies only to offshore installations
  2. The Code overrides the Regulations where they conflict
  3. The Code gives practical guidance on complying with the Regulations and can be used as evidence of contravention Correct answer.
  4. The Code replaces the need for thorough examination

Explanation

An Approved Code of Practice provides practical guidance on meeting the legal duties and, where relevant, may be relied on as evidence of contravention of the associated provision. It does not override the Regulations, is not limited to offshore work, and cannot replace statutory examination.

Question 22Legislation and Standards Applicable to Self-Erect Cranes

A self-erect crane has been modified by the user, altering its mast configuration beyond the manufacturer's specification. Which legal position applies?

  1. The modification is permitted provided the crane still lifts the intended load
  2. The modification is permitted if recorded in the maintenance log
  3. The modification may remove conformity and requires reassessment by a competent person before further use Correct answer.
  4. The modification is permitted if the operator is experienced

Explanation

Modifying lifting equipment outside the manufacturer's specification can affect conformity, strength and stability, so it must be reassessed by a competent person before further use. Load success, log entries or operator experience do not make an unassessed modification lawful.

Question 23Legislation and Standards Applicable to Self-Erect Cranes

Which combination best reflects the statutory framework applying to a self-erect crane operating on a UK construction site?

  1. HSWA 1974, PUWER 1998, LOLER 1998, CDM 2015 and RIDDOR 2013 Correct answer.
  2. Only LOLER 1998
  3. Only the site's own procedures
  4. Only the manufacturer's manual

Explanation

The general duties in HSWA 1974 are supplemented by PUWER, LOLER, CDM and RIDDOR, which together govern equipment suitability, lifting operations, project coordination and incident reporting. No single instrument, manual or site procedure alone constitutes the framework.

Question 24Legislation and Standards Applicable to Self-Erect Cranes

A self-erect crane is to be used to lift a person in a suspended platform. Which additional LOLER requirement applies to the lifting equipment used?

  1. The equipment must be fitted with a reversing alarm
  2. The equipment must be specifically designed for lifting people or otherwise assessed as suitable for that purpose Correct answer.
  3. The equipment must be painted yellow
  4. The equipment must be examined weekly by the operator

Explanation

LOLER requires that equipment used for lifting people is specifically designed for that purpose, or that its suitability is otherwise established by a competent person. Colour, weekly operator examination and reversing alarms are not the applicable requirement.

Question 25Crane Types, Components and Terminology

On a self-erecting tower crane, what is the primary purpose of the ballast counterweight blocks?

  1. To offset the overturning moment created by the load and jib Correct answer.
  2. To provide electrical earthing for the hoist motor
  3. To anchor the crane base to the foundation
  4. To increase the hook block descent speed

Explanation

Ballast counterweights produce a moment opposite to that of the load and jib, keeping the resultant within the crane's stability base. They are sized by the manufacturer for the crane's rated load chart and configuration.

Question 26Crane Types, Components and Terminology

What does the load moment limiter on a self-erecting crane continuously calculate?

  1. The wind speed acting on the jib surface
  2. The total number of hoist drum revolutions
  3. The product of the lifted load and its working radius Correct answer.
  4. The hydraulic pressure in the slewing gearbox

Explanation

The load moment limiter compares load multiplied by radius against the rated moment for the jib configuration. It warns and then cuts out movements before the rated moment is exceeded.

Question 27Crane Types, Components and Terminology

In self-erecting crane terminology, the jib is best described as which component?

  1. The horizontal working arm along which the trolley travels Correct answer.
  2. The short rear arm carrying the counterweight
  3. The base frame that spreads load into the ballast
  4. The vertical mast section that carries the slewing ring

Explanation

The jib is the horizontal working arm that supports the trolley and load. The mast is the vertical structure, and the rear arm is the counter-jib.

Question 28Crane Types, Components and Terminology

What is the function of the slewing ring on a self-erecting tower crane?

  1. It raises and lowers the telescoping mast sections
  2. It allows the upper structure to rotate relative to the base Correct answer.
  3. It locks the trolley at a fixed radius
  4. It guides the hoist rope onto the drum

Explanation

The slewing ring is the large bearing that connects the rotating upper structure to the fixed base or mast. The slewing drive pinion engages its gear teeth to rotate the crane.

Question 29Crane Types, Components and Terminology

Which device on a self-erecting crane is designed to prevent the hook block from contacting the jib?

  1. The hoist limit switch Correct answer.
  2. The slew brake
  3. The slack rope detector
  4. The trolley limit switch

Explanation

The hoist limit switch stops the hoist in the raise direction before the hook block reaches the jib or trolley. It is a mandatory safety device tested during inspection.

Question 30Crane Types, Components and Terminology

What does the term 'working radius' mean for a self-erecting crane?

  1. The distance between the two ballast blocks
  2. The length of rope spooled on the hoist drum
  3. The vertical distance from the hook to the ground
  4. The horizontal distance from the slewing centre to the hook Correct answer.

Explanation

Working radius is measured horizontally from the axis of slewing to the centreline of the hook. Rated capacity decreases as working radius increases.

Question 31Crane Types, Components and Terminology

A self-erecting crane is fitted with a two-fall reeving arrangement instead of single fall. What is the effect on rated capacity?

  1. Rated capacity is increased within the reduced maximum radius Correct answer.
  2. Rated capacity is halved at every radius
  3. Rated capacity depends only on the counterweight
  4. Rated capacity is unchanged at all radii

Explanation

Two-fall reeving doubles the mechanical advantage at the hook, raising the rated load for a given rope pull. The trade-off is reduced maximum hook height and speed.

Question 32Crane Types, Components and Terminology

During erection of a self-erecting crane, the mast sections are folded and unfolded. Which component provides the force for this operation on a typical hydraulic self-erector?

  1. The trolley drive through the jib chord
  2. The slewing motor through the ring gear
  3. The hoist winch acting through the load line
  4. The erection cylinder or erection winch system Correct answer.

Explanation

Self-erectors use a dedicated erection cylinder or erection winch to fold and unfold mast and jib sections. This system is independent of the load hoist.

Question 33Crane Types, Components and Terminology

Why must the trolley be positioned at the specified radius before the crane is folded for transport?

  1. To keep the centre of gravity within the transport stability envelope Correct answer.
  2. To align the jib with the anemometer
  3. To release tension from the slewing ring bolts
  4. To allow the hoist rope to be cut to length

Explanation

Manufacturers specify trolley and jib positions for the folded transport configuration so the centre of gravity stays within the stability envelope of the chassis or transport frame. Incorrect positioning can cause tipping during folding or road transport.

Question 34Crane Types, Components and Terminology

What is the purpose of the anemometer fitted to a self-erecting crane?

  1. To measure hydraulic oil temperature
  2. To measure wind speed so operations stop at the rated limit Correct answer.
  3. To record the total hoisting hours for servicing
  4. To detect load sway during slewing

Explanation

The anemometer measures wind speed at the crane and triggers warning or stop limits set by the manufacturer. Wind limits are specified in the operating manual.

Question 35Crane Types, Components and Terminology

A self-erecting crane has a maximum rated capacity of 4 t at 12 m and 1.2 t at 30 m. What does this indicate about the load chart?

  1. Capacity depends only on the number of ballast blocks
  2. Capacity decreases as radius increases due to moment limits Correct answer.
  3. Capacity increases with radius because the jib is stronger at the tip
  4. Capacity is constant and the figures are for different hoist speeds

Explanation

Rated capacity falls with increasing radius because the load moment rises for the same load. Structural strength and stability both limit the moment, producing a decreasing load chart.

Question 36Crane Types, Components and Terminology

Which component transfers the crane's overturning forces into the ballast frame on a self-erecting crane?

  1. The hoist rope guide rollers
  2. The limit switch lever arms
  3. The trolley buffer stops
  4. The slewing ring and base frame connection Correct answer.

Explanation

Overturning moments pass through the slewing ring into the base frame and then into the ballast. The connection must be correctly torqued and inspected.

Question 37Crane Types, Components and Terminology

What is the difference between the counter-jib and the jib on a self-erecting crane?

  1. Both carry counterweight but on opposite sides
  2. The counter-jib carries the counterweight; the jib carries the trolley and load Correct answer.
  3. The counter-jib carries the trolley; the jib carries the counterweight
  4. The counter-jib is the mast extension above the slewing ring

Explanation

The counter-jib is the short rear arm that supports the counterweight and often the hoist machinery. The jib is the longer front arm along which the trolley travels.

Question 38Crane Types, Components and Terminology

A crane operator notices the load moment limiter alarm sounding as the trolley moves outward with a suspended load. What is the correct interpretation?

  1. The hoist brake has failed and the load is falling
  2. The slewing ring lubrication is low
  3. The permitted load moment is being approached or exceeded Correct answer.
  4. The wind speed has exceeded the operating limit

Explanation

The load moment limiter warns when load times radius approaches the rated moment. The operator should reduce radius or load before the limiter cuts out the movement.

Question 39Crane Types, Components and Terminology

Why are self-erecting crane load charts specific to a jib length and ballast configuration?

  1. Because structural and stability limits change with geometry and counterweight Correct answer.
  2. Because the hoist motor power changes with jib length
  3. Because the anemometer is recalibrated for each jib
  4. Because the wire rope diameter changes with ballast

Explanation

Jib length changes the dead load moment and structural capacity, while ballast changes the resisting moment. Each combination therefore has its own rated capacities.

Question 40Crane Types, Components and Terminology

Which item is a structural component rather than a safety device on a self-erecting crane?

  1. The overload warning buzzer
  2. The hoist limit switch
  3. The trolley rope tensioner
  4. The mast section Correct answer.

Explanation

The mast section is a primary structural member that carries compressive and bending loads. Limit switches, tensioners and buzzers are safety or control devices.

Question 41Crane Types, Components and Terminology

A self-erecting crane is being configured with a longer jib. Which combination of changes is expected?

  1. Higher hoist speed and reduced maximum radius
  2. Higher rated capacities at long radius and lower ballast requirement
  3. Lower rated capacities at long radius and possibly increased ballast Correct answer.
  4. No change to capacity but higher slewing speed

Explanation

A longer jib increases dead load moment and reduces capacity at long radius, often requiring more counterweight to maintain stability. Hoist and slew speeds are unaffected by jib length.

Question 42Crane Types, Components and Terminology

During inspection, a technician finds the hoist limit switch bypassed with a jumper wire. What is the correct technical conclusion?

  1. The crane may operate normally because the load moment limiter provides backup
  2. The crane is unsafe and must be taken out of service until the switch is restored Correct answer.
  3. The bypass only affects the lower limit and can be left
  4. The bypass is acceptable if the operator is trained

Explanation

Safety devices such as hoist limit switches must not be bypassed; doing so removes the protection against two-blocking. The crane must be withdrawn from service until the device is restored and tested.

Question 43Crane Types, Components and Terminology

Why does the rated capacity of a self-erecting crane typically drop sharply at maximum radius compared with mid-radius?

  1. The anemometer reading increases with radius
  2. The trolley motor loses power at the jib tip
  3. The structural moment capacity of the jib and the stability margin both become limiting Correct answer.
  4. The hoist rope strength falls as more rope is paid out

Explanation

At large radius the load moment is highest for a given load, so both jib structural capacity and the stability margin against tipping become critical. This produces a steep fall-off in the load chart near maximum radius.

Question 44Crane Types, Components and Terminology

A self-erecting crane is to be sited beside an excavation. Which foundation-related factor most directly affects the crane's stability terminology and rating?

  1. The colour coding of the ballast blocks
  2. The bearing capacity and levelness of the supporting ground or slab Correct answer.
  3. The length of the pendant ropes
  4. The number of reeving falls used

Explanation

The crane relies on a level, adequately bearing support to develop its rated stability. Poor bearing capacity or out-of-level ground invalidates the assumed support conditions and the load chart.

Question 45Site Assessment, Ground Conditions and Siting

Before a self-erecting crane is sited, which document should be consulted first to establish the permissible foundation bearing pressure?

  1. The toolbox talk record
  2. The crane manufacturer's operating manual Correct answer.
  3. The site waste management plan
  4. The lift plan for the day

Explanation

The manufacturer specifies the foundation requirements and maximum permissible ground bearing pressure for the crane. Site-specific ground data must then be checked against these values. No other document defines the crane's structural limits.

Question 46Site Assessment, Ground Conditions and Siting

A self-erecting crane is to be placed on ground backfilled over a recent excavation. What is the most appropriate action before siting?

  1. Proceed if the surface looks level and firm
  2. Assume the fill is adequate if compacted by machine
  3. Increase the ballast to compensate for soft ground
  4. Obtain geotechnical confirmation of bearing capacity at the crane footprint Correct answer.

Explanation

Made ground and backfill can be variable and may not have been placed to an engineering specification. The bearing capacity at the actual footprint must be verified by competent geotechnical assessment. Visual inspection and assumptions cannot confirm capacity.

Question 47Site Assessment, Ground Conditions and Siting

What is the primary purpose of a crane base or foundation assessment in the siting process?

  1. To ensure loads are spread so ground pressure stays within safe limits Correct answer.
  2. To determine the crane's power supply rating
  3. To confirm the crane will fit within the site boundary
  4. To calculate the number of lifts per shift

Explanation

The foundation distributes the crane's maximum loads over an area sufficient to keep ground pressure within the permissible bearing capacity. This prevents settlement, overturning or collapse. Boundary fit, productivity and electrical rating are separate considerations.

Question 48Site Assessment, Ground Conditions and Siting

A site has a known buried services corridor crossing the intended crane position. Which action best addresses this hazard?

  1. Relocate the crane so the foundation avoids the corridor Correct answer.
  2. Ask the groundworker to confirm the services are deep enough
  3. Reduce the crane's working radius over the corridor
  4. Mark the services on the surface and proceed

Explanation

The crane foundation imposes concentrated loads that can crush or distort buried services and create voids beneath the base. The safest control is to position the crane clear of the corridor. Surface marking alone does not prevent load transfer to the buried asset.

Question 49Site Assessment, Ground Conditions and Siting

Why must the out-of-service wind condition be considered when siting a self-erecting crane?

  1. To set the maximum load chart
  2. To calculate the fuel consumption
  3. To size the electrical supply cable
  4. To confirm the crane can be left safely in high winds Correct answer.

Explanation

The manufacturer defines a wind speed at which the crane must be placed in a safe out-of-service condition. Siting must account for whether that condition can be achieved and whether surrounding structures create turbulence. Electrical supply, fuel use and load charts are separate design matters.

Question 50Site Assessment, Ground Conditions and Siting

A proposed crane position sits in the shadow of a tall building that will remain throughout the works. What is the main siting concern?

  1. Wind turbulence and funnelling around the structure Correct answer.
  2. Reduced radio signal quality for the operator
  3. Excessive shade on the crane paintwork
  4. Interference with site lighting

Explanation

Adjacent tall structures can create turbulence, funnelling and downdraughts that affect the crane's stability and out-of-service behaviour. The manufacturer's wind data must be considered alongside the local wind environment. Radio, paintwork and lighting are not the governing safety issues.