How to Use a Boom Lift Safely

By Christopher Green, UP2IT Access Hire · 18 September 2026 · 7 min read

Boom lifts get you higher and further out than any scissor lift, up and over obstacles or across gaps a scissor can’t reach. That reach is also what makes them less forgiving. A boom carries its whole platform load out beyond its wheels, so ground, slope and how you drive matter even more.

The short version

• Pick the right boom: telescopic for maximum reach, knuckle for up-and-over and tight sites.
• Always wear a harness clipped to the platform’s certified anchor point.
• Our booms have no stabilisers. Stability comes from level, firm ground and staying within the slope rating.
• Lower the boom and face the direction of travel when moving between work areas.
• Keep 4 m from power lines and plan a rescue before anyone goes up.

Telescopic vs knuckle: which do you need?

A telescopic (straight or stick) boom extends in a straight line from the turntable. A knuckle (articulating) boom has two or more sections joined by hinges, so it can climb up, fold over an obstacle and reach down or out on the other side.

Choose a telescopic boom when you need: maximum height and horizontal outreach, to stay well back from the work (beyond a garden, footpath or loading dock), and fast positioning across open sites.

Choose a knuckle boom when you need: to reach up and over parapets, roofs, pipework or machinery, to work in tight or congested sites, or a compact machine with little or no tail swing.

Not sure which one?

Tell us the working height, how far out you need to reach, what’s in the way and the ground conditions. We’ll match the right machine to the job. We also offer free site inspections to help you make the right decision.

1. Before you start

• Be trained on booms. A scissor lift ticket doesn’t cover boom lifts. Get a familiarisation on the exact model: platform and ground controls, emergency stop, auxiliary lowering, tilt alarm and the load chart. UP2IT Access Hire provides full training to NZQA unit standard 23962 to cover booms.
• Do a pre-start check every shift: current certificate of inspection, no leaks or damage to the boom, pins and hoses, tyres and wheels sound, platform gate and rails secure, controls, alarms and emergency lowering working.
• Check the platform rating. Many booms have two capacities: a higher one with reduced outreach and a lower one at full reach. Know which zone you’re working in.
• Plan the site. Walk the route, check ground and overhead hazards, and set up barriers or an exclusion zone around the machine and below the platform.

2. Ground and slopes: no stabilisers, no margin

UP2IT booms are self-propelled machines without stabilisers or outriggers. They stay upright through their counterweight, the width of the chassis and level, firm ground. There’s nothing to level the machine for you, so the ground does all the work.

Know the slope limits

Lifting: booms are only rated to work on a small slope, typically <5° for many self-propelled booms. The exact figure for your machine is on the decals and in the manual.

Driving: a machine’s gradeability (the slope it can climb stowed) is much steeper than its working slope. Never confuse the two.

Tilt alarm: if it sounds, stop. Retract and lower the boom straight away. Don’t try to drive or slew your way out of it.

• Set up on firm, level ground. If the spot isn’t level, find another one. Never pack timber or blocks under wheels to level a boom.
• Mind the wheel loads. Booms are heavy and the load swings from wheel to wheel as the boom slews. One wheel can carry a large share of the machine’s weight. Check the wheel loads on the decal before working on suspended slabs, pavers, covers or anything hollow underneath.
• Watch for hidden voids. Backfilled trenches, soft verges, service pits, manholes and recently laid paving can give way under a single wheel.
• Wet ground changes everything. Grass, clay and gravel that held fine yesterday can soften after rain. Re-check the ground every time conditions change.
• Drive slopes stowed. Travel up and down slopes with the boom fully lowered and retracted, and follow the manual’s instructions on which way the counterweight should face.
• Keep away from edges. Stay well back from kerbs, retaining walls, banks, excavations and loading docks. Ground near an edge is often weaker than it looks.

3. Driving and positioning

• Lower and retract to travel. WorkSafe advises lowering the boom when moving between work areas, pointing it in the direction of travel, and facing the way you’re going (WorkSafe NZ).
• Drive elevated only when necessary, slowly, on firm level ground, with a clear path.
• Watch for the catapult effect. A wheel dropping into a hole or hitting a kerb gets amplified at the platform. WorkSafe warns operators can be catapulted out of the basket when driving. This is exactly why wearing a harness matters.
• Check the steer direction. With the turntable slewed round, the drive and steer controls can work in reverse. Check the colour-coded arrows on the chassis before moving.
• Mind the tail swing. Telescopic booms have a counterweight that sweeps out past the chassis when you slew. Keep people, vehicles and walls clear of that zone. Many knuckle booms have little or none, but check the model.
• Use a spotter in tight areas, near traffic or when you can’t see the ground around the machine.

4. Working at height

Harness on, every time

WorkSafe requires operators of boom-type lifts to wear, and be trained in the use of, a harness inside the platform, attached to a certified anchor point with a short energy-absorbing lanyard or a suitable self-retracting lifeline that keeps you in the basket. Never clip to the guardrail. UP2IT Access Hire provides training to NZQA unit standard 23229 on the safe use of harnesses at height (EWP Training | UP2IT).

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• Crushing against structures. Booms move in several directions at once, so it’s easy to drift into a beam, soffit or gutter while watching your work. Move one function at a time near structures, and never lean over the controls.
• Wind. Wind speed increases with height, and buildings can funnel gusts. Use an anemometer at platform height, and stop work when you reach the limit on the machine’s serial plate or 12.5 metres per second, whichever is lower.

5. Overhead power lines

The 4 metre rule

Under NZECP 34, every part of the machine must stay at least 4.0 m from a live overhead line unless the line owner gives written consent (NZECP 34 extract). Between 4 and 6.4 m, WorkSafe advises a dedicated safety observer.

A boom’s reach makes it easy to swing into a line you didn’t see. In Auckland, close approach consents come from Vector.

If you touch a line: stay in the platform. If it’s safe, use the controls to move away and break contact. If you can’t, stay put and keep everyone well clear until the power company confirms the line is dead.

6. If something goes wrong

Agree a rescue plan before anyone goes up, and make sure your ground person knows the machine.

1. Hit the emergency stop if something is wrong.
2. Lower from the ground controls. A trained person on the ground should know how to select ground control and bring the platform down.
3. Use auxiliary or emergency lowering if the engine or power fails. Show your ground person where it is before you start.
4. Trapped against a structure? Think before moving. The wrong function can make it worse. Lower or retract away from the structure if it’s safe.
5. Call 111 for any injury, entrapment, loss of contact or a worker suspended in a harness.

Quick boom safety checklist

Print this out or keep it on your phone.

☐ Trained and familiarised on this boom

☐ Pre-start check done, certificate current

☐ Right boom for the job: reach, up-and-over, site space

☐ Ground firm and level, within the slope rating, no voids

☐ Wheel loads checked against slabs, covers and pavers

☐ Tail swing zone and area below barriered off

☐ Harness on and clipped to the certified anchor

☐ Overhead path checked, 4 m from power lines

☐ Wind speed checked against the machine rating

☐ Ground person briefed and rescue plan agreed

Need a boom lift or EWP training?

UP2IT Access Hire supplies serviced, certified telescopic and knuckle booms across Auckland from our Penrose depot, delivered on our own trucks. We run EWP operator training on your site or in our modern classrooms. And if a machine can’t be fixed on site within half a day, we’ll swap it where possible.

Call 0800 830 530

Browse our boom lifts →

EWP training →

This guide is general information only. Always follow the manufacturer’s operating manual, your site safety plan and current WorkSafe NZ guidance.

Sources

• WorkSafe NZ – Mobile elevating work platforms
• NZECP 34 minimum approach distance extract (Westpower)
• Vector – Working near our network
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