Working at Height

What is the legal height at which special precautions for working at height become mandatory under UK law?

• AOnly above 2 metres, measured from the working platform down to the ground
• BAbove 3 metres
• CAny height from which a fall could cause injury✓
• DOnly above 10 metres

Answer: The Work at Height Regulations 2005 define working at height as any work where someone could fall and be injured. This includes falls from low heights onto hard surfaces. The 2m guidance is illustrative, not absolute.

Which of the following is the correct order of the hierarchy of control for working at height?

• AHarnesses first, then guardrails, then training, and finally other personal protective equipment
• BTraining first, then equipment selection, then written procedures, and finally inspection of the work
• CPersonal protective equipment first, then harnesses, then guardrails, with elimination considered last
• DElimination, collective protection (guardrails), personal harnesses, PPE✓

Answer: The hierarchy prioritises elimination of the fall hazard, then collective protection (guardrails, netting), then personal fall arrest systems, and finally other PPE. PPE is the last resort, not the first.

A worker is asked to climb a ladder to fix a gutter. What should be checked first?

• AThe weather forecast for the rest of the week, so that the job can be booked in on a dry day
• BWhether the ladder is secured, in good condition, and positioned at the correct angle✓
• CWhether the worker has been issued with a hard hat and a high-visibility vest for the job
• DThe worker's age

Answer: Ladder safety requires secure positioning, structural integrity, and a 4:1 or 75-degree angle. Age and weather are secondary; equipment condition is primary.

What angle should a ladder be positioned at for safe use?

• AApproximately 75 degrees (4:1 base to height ratio)✓
• B30 degrees
• CApproximately 45 degrees (a 1:1 base to height ratio)
• DVertical

Answer: The 4:1 ratio (1 unit out for every 4 units up) creates approximately a 75-degree angle. This balance prevents slipping at the base and tipping backward at the top.

Mobile Elevated Work Platforms (MEWPs) are commonly used on construction sites. Which statement is TRUE?

• AFall harnesses are never needed when working from one, whatever the platform design
• BThey require trained and authorised operators only✓
• CThey need a formal inspection only once a year, and no checks at the start of a shift
• DThey can be operated by anyone on site who has watched someone else use one

Answer: MEWP operation requires competence and training. Daily safety checks are mandatory. Fall harnesses may be required depending on the platform design and height.

When is a fall arrest harness required on a construction site?

• AWhen working at height where elimination or guardrails are not practicable, and there is a significant fall risk✓
• BGuardrails, netting and other collective measures are always sufficient on a construction site, whatever the task
• COnly for workers over 40 years old
• DOnly for external work

Answer: Fall arrest harnesses are used when collective protection (guardrails) cannot be provided and there is real fall risk. They are part of the hierarchy, not the first choice.

Guardrails or handrails must be installed on construction scaffolding at a height of:

• A0.6 metres only
• BOnly where workers ask for them, since guardrail heights are a matter for the scaffolding gang to agree on site
• CAt least 950mm, with an intermediate rail (gaps no more than 470mm) and a toe board at least 150mm high✓
• D2 metres or higher

Answer: The Work at Height Regulations 2005 (Schedule 2) require a top guard-rail at least 950mm above the edge, an intermediate rail with no gap exceeding 470mm, and a toe board at least 150mm high. These are mandatory, not optional.

A worker is found not wearing a hard hat while working on a construction site at height. Under UK law, what could happen?

• AThe worker themselves could face prosecution or disciplinary action under HSWA 1974✓
• BThey are simply warned
• CThe Work at Height Regulations only apply to work on the outside of a building, so nothing would follow
• DOnly the employer can be prosecuted, as workers carry no personal duties under the Act

Answer: Section 7 HSWA 1974 makes workers responsible for their safety. Failure to wear required PPE can result in prosecution of the individual as well as the employer.

Before work at height begins, a risk assessment must identify:

• AOnly the weather forecast for the day, since bad weather is the sole cause of falls from height
• BWhether workers have eaten before starting, so that nobody becomes light-headed on the platform
• CThe distance of the fall, existing controls, rescue procedures, and emergency response✓
• DOnly the cost of the access equipment, so that the cheapest option can be hired for the job

Answer: The Work at Height Regulations 2005 require assessment of fall distance, protective measures, rescue plans, and emergency procedures. Weather, costs, and meals are not assessment priorities.

Edge protection is required on construction sites at height. Which of the following is NOT a form of edge protection?

• APersonal reminder notices✓
• BGuardrails fitted with a top rail, an intermediate rail and a toe board
• CBarriers or wall protection
• DSafety netting rigged below the working level to catch a falling person

Answer: Edge protection includes physical measures (guardrails, barriers, nets, catch platforms). Warning notices alone do not prevent falls and do not meet edge protection requirements.

Under UK regulations, what is the primary hazard when working on fragile roof surfaces in construction?

• ANoise from wind
• BUV exposure
• CWind damage to the building itself, as sheets lifted by gusts can be torn from the roof and have to be refixed before the covering is watertight again
• DFall through the surface to a lower level, potentially fatal; fragile surfaces (asbestos, corrugated plastic, rotten timber) collapse under weight✓

Answer: Fragile surfaces collapse under load, causing falls to lower levels. This is distinguished from falls on firm surfaces by the added hazard of collapse. Wind, noise, and UV are separate hazards.

What does the Work at Height Regulations 2005 require when work cannot be avoided on fragile surfaces?

• AWorkers must be issued with extra personal protective equipment such as a harness, hard hat and gloves, and may then walk straight out onto the fragile sheets without staging, netting or any other precaution being provided
• BWorkers must simply proceed with caution, testing each sheet by standing on it before putting their full weight on it, and reporting anything that feels soft to the supervisor at the end of the shift
• CPrecautions must be taken in order: avoid work, use alternative safe methods, or if unavoidable, use fall prevention systems (netting, soft landing), fall arrest, or rescue procedures✓
• DOnly warning notices are needed at the access points to the roof, stating that the surface is fragile, after which each worker decides for themselves whether it is safe to continue across it

Answer: WAHR 2005 mandates a hierarchy: avoid fragile work, substitute with safer methods, or implement control systems. Caution, warnings, and extra PPE alone are insufficient. Netting and rescue represent engineered controls.

How does a safety net system protect workers during roofing work on high buildings?

• AIt provides shade for the workers below the roof line, keeping them cooler during the summer months and reducing the risk of heat exhaustion on long shifts
• BIt acts as a windbreak stretched below the roof edge, cutting the wind speed across the working surface so that workers are not blown off their feet while fixing sheets
• CIt is fitted only to catch dropped tools and offcuts of material, protecting the people and the public walking below rather than anyone working on the roof itself
• DIt arrests a falling worker's descent, decelerating the fall to reduce impact injuries or prevent the person reaching the ground or lower obstruction✓

Answer: Safety netting catches and slows falling objects and people. It doesn't prevent wind or provide shade; debris netting is separate. The deceleration principle is critical—rapid stop at ground level causes injury, but net deceleration over distance reduces harm.

What is an airbag system used for in construction, and what is a critical limitation?

• ATo provide comfortable resting areas for workers
• BTo arrest falls by cushioning impact; however, it only protects the area directly above it and cannot catch all falling objects reliably✓
• CTo reduce wind speeds on high structures
• DTo provide insulation for temporary structures

Answer: Airbags decelerate falls in their footprint area. The critical limitation is fixed coverage—a person falling outside the airbag's perimeter still hits hard ground. This makes them unsuitable as sole protection for widespread fall risk.

Under LOLER 1998, who must inspect a mobile elevated work platform (MEWP) before first use on site?

• AThe hire company that supplied the machine, on its own, since the inspection is part of the rental agreement and does not have to be repeated on site
• BA competent person, typically before initial use and periodically thereafter to ensure safety mechanisms function✓
• CThe operator only
• DThe HSE inspector

Answer: LOLER 1998 requires competent person inspection before first use and within each 6-month period. Operators perform pre-shift checks but aren't 'competent persons' for formal inspection. Rental companies arrange but don't necessarily perform on-site inspections.

Why must workers using tower scaffolds be trained in rescue procedures even if safety harnesses are provided?

• ARescue training is a paperwork exercise only, because a worker who falls from a tower scaffold will be reached by the emergency services long before any harm can come to them
• BIf a worker is suspended after a fall, uncontrolled suspension can cause injury; rescue training and procedures ensure swift, safe recovery✓
• CTo satisfy insurance requirements
• DSo that the amount of fall protection fitted to the tower can be reduced, since a trained rescue team removes the need for guardrails at the working platform

Answer: Suspended worker rescue is critical because prolonged suspension can cause suspension trauma (loss of consciousness, even death, from blood pooling). Training enables competent rescue and prevention of secondary injury. Insurance is consequential; rescue capability is safety essential.

What is a Personal Fall Arrest System (PFAS) and when is it appropriate in construction?

• AA combination of harness, lanyard, and anchor point that arrests a fall and suspends the user safely; appropriate when fall prevention and collective protection are not feasible✓
• BA safety net for catching all falling workers
• CAn alternative to training workers in safe work
• DA system that prevents all falls permanently

Answer: PFAS consists of harness, lanyard, and anchor; it arrests rather than prevents falls. It's appropriate only after eliminating fall hazards and ruling out better collective measures. It doesn't prevent falls—it limits injury from unavoidable falls.

Under the Work at Height Regulations, what must be considered when selecting an anchor point for a safety harness?

• AHow convenient the point is for the worker to clip on to, so that the least amount of walking and climbing is needed during the shift, whatever the point happens to be fixed to
• BLoad capacity, stability, height above the fall distance, and freedom from sharp edges; it must withstand the load without shifting or failure✓
• CCost of installation
• DWhether it looks professional

Answer: Anchor points must be engineered for safety: rated to the relevant standard for fall arrest (BS EN 795), immobile, positioned to minimise the fall distance, and free from sharp edges that could cut the lanyard. Convenience, cost and appearance are not selection criteria.

In UK construction, the free fall distance in a personal fall arrest system is normally limited to what maximum?

• A2 metres✓
• BIt depends on the user's weight
• C6 metres
• DNo maximum if the harness is comfortable

Answer: Around 2 m is the practical limit, because a standard shock-absorbing lanyard to BS EN 355 is up to 2 m long. Limiting free fall keeps the impact force on the body within what the system is designed to absorb and reduces the time a casualty hangs in suspension. The Work at Height Regulations set no numeric free-fall figure — it follows from the equipment standard.

Why must guardrails on temporary structures be at least 950mm in height under UK construction standards?

• ATo prevent contact with the guardrail causing workers to lose balance; the height (set by the Work at Height Regulations 2005) keeps the rail above the centre of gravity for most users✓
• BTo comply with the aesthetic preferences set out in the architect's specification for the temporary works, which fixes rail heights so that scaffolds look consistent across the elevation of the building
• CTo accommodate tall workers only
• DTo look more imposing to workers

Answer: The Work at Height Regulations 2005 (Schedule 2) set a minimum guardrail height of 950mm, chosen so that a worker leaning or tripping contacts the rail above their centre of gravity, reducing the risk of flipping over the top. This protects all users, not just tall workers, and the figure is a legal minimum, not an aesthetic choice.

When is a leading-edge worker (doing work at the edge of a structure as it is being built) at increased risk?

• AOnly where the structure being built is narrow, since a wide floor plate gives enough room for the worker to keep away from the open edge without any need for harnesses or safety lines
• BOnly on rainy days
• COnly if they are over 50 years old
• DContinuously, as they work at unprotected heights without permanent structures; protection requires harnesses, safety lines, and rescue procedures synchronised with the work pace✓

Answer: Leading-edge work is inherently high-risk because fall prevention must move with the work. Harnesses and lines must synchronise with construction pace. Weather, age, and structure width affect risk but don't define the core hazard.