If overhead power lines run anywhere near your pour site, this is the one question you cannot get wrong. Under UK HSE guidance, a concrete boom pump should stay at least 9 metres from lines on wooden poles and at least 15 metres from lines on steel pylons, measured horizontally with the boom at full reach.
How Close Can A Concrete Boom Pump Work
At Easypump Concrete Ltd, we check overhead hazards before every boom pump hire across London, Hertfordshire, Bedfordshire, Buckinghamshire, Essex and Northampton. This guide explains where those distances come from, why they matter, and how to plan a pour when cables sit close to your site.
The Short Answer: Safe Distances by Voltage
The Health and Safety Executive sets out these distances in GS6, Avoiding Danger from Overhead Power Lines. It is the standard every pump operator, site manager and contractor in the UK is expected to follow when plant works near live lines.
The recommended exclusion distances are:
- 9 metres from lines suspended on wooden poles, which typically carry up to 33kV
- 15 metres from lines suspended on steel towers or pylons, which can carry up to 400kV
- Both measured horizontally from the nearest conductor, not from the base of the pole
- Distances apply whenever the boom could reach the line at full extension and slew
These are planning distances, not fixed legal limits. The final safe clearance for your pour should be confirmed with the Distribution Network Operator, because voltage, cable sag and swing all affect how far electricity can arc.
Why Overhead Cables Are a Serious Risk for Boom Pumps
A concrete boom pump is one of the tallest machines that will ever visit a typical site. Booms on truck-mounted pumps extend 20 to 40 metres vertically, which puts them within reach of most overhead lines found across London and the Home Counties.
The danger is not limited to direct contact. High voltage electricity can arc across an air gap, so a boom that only gets close to a live conductor can still draw a fatal current through the steel boom, the pipeline and the wet concrete inside it.
Getting this wrong can lead to:
- Fatal or life-changing electric shock to the operator and ground workers
- Fire or explosion at the pump truck
- Damage to the electricity network and local power cuts
- HSE investigation, prosecution and unlimited fines
UK Rules and Guidance You Must Follow
HSE GS6 provides the core framework. It requires anyone planning work near overhead lines to first ask if the work can be moved, then if the line can be switched off, and only then whether the job can proceed with controls in place. Jumping straight to “we will be careful” is not acceptable.
Two more layers sit alongside GS6. The Electricity at Work Regulations 1989 place a legal duty on employers to prevent danger from live conductors, while BS 8476, the code of practice for safe concrete pumping, requires boom movements to be planned before the pour starts.
Your Distribution Network Operator holds the critical details:
- The exact voltage of the line crossing or bordering your site
- Whether a temporary disconnection can be arranged for the pour
- Any minimum clearances they require beyond the GS6 defaults
Contacting the DNO is free and should happen early, since temporary shutdowns often need one to two weeks of notice. Easypump Concrete Ltd will always ask about overhead lines at booking, but the DNO conversation is one the site owner or principal contractor needs to start.
How to Plan a Pour Near Overhead Lines
A safe pour near cables is decided before the truck leaves the yard. When you contact Easypump Concrete Ltd about boom pump hire on a site with overhead lines, we ask for photos or a short video showing the lines, the pour location and the access route.
That information tells us whether a boom pump can set up outside the exclusion zone and still reach your pour. From there, the realistic options are:
- Reposition the pump so the boom works away from the lines at all times
- Restrict the boom slew with agreed dead zones the operator never swings into
- Install goal posts and barriers to mark the exclusion zone on the ground
- Use a banksman whose only job is watching boom position against the cables
- Request a line shutdown from the DNO for the duration of the pour
- Switch to a line pump, which removes the overhead risk completely
If the numbers do not work for a boom, forcing it is never the answer. A ground-level option is always available, and it usually costs less than an aborted pour.
Boom Pump vs Line Pump Near Cables
A line pump moves concrete through pipework laid along the ground, so nothing rises towards the cables. For sites in Hatfield, London and the surrounding counties where lines cross directly over the pour, a line pump is often the fastest way to keep the job safe and on schedule.
A boom pump can still be the right choice where the lines sit to one side and a proper exclusion zone can be held with barriers and a banksman. The honest comparison:
- Line pump: zero overhead risk, ideal for tight access, slightly slower on large pours
- Boom pump: faster placement over obstacles, only viable with confirmed cable clearance
Easypump Concrete Ltd advises on the right pump for your specific site rather than defaulting to the biggest machine. Getting that call right at booking saves wasted concrete and a rebooking fee.
What Easypump Concrete Ltd Does to Keep Your Site Safe
Every boom pump job starts with an access and hazard check, and overhead services sit at the top of that list. Our trained, experienced operators follow GS6 exclusion distances without exception and have the authority to stop a pour if site conditions do not match the plan.
Because we supply ready mix and onsite mixed concrete alongside concrete pump hire, one team coordinates the mixer, the pump and the placement. That single point of contact keeps restricted pours clean and continuous, with same-day and next-day slots available across London, Hertfordshire, Bedfordshire, Buckinghamshire, Essex, and Northampton.
FAQs
Can a boom pump work directly under live power lines?
No. The only time a boom operates inside the exclusion zone is when the DNO has isolated the line and confirmed it dead in writing. Verbal assurances are never enough.
Who is responsible for checking the cable voltage?
The site owner or principal contractor should contact the DNO, since they control the site. Easypump Concrete Ltd will flag the hazard and help you understand what to ask for.
Do rain or wind change the safe distance?
Wet conditions increase conductivity and strong wind makes both cables and booms sway. The published distances are minimums, so operators add extra caution and may pause the pour.
Can Easypump supply both the concrete and the pump for a restricted site?
Yes. We provide ready mix or volumetric concrete together with line pump or boom pump hire and a trained operator, so the whole pour is planned around your site constraints.
Plan Your Pour Around Overhead Cables the Right Way
If cables sit anywhere near your pour, tell us at the quote stage and send a few photos of the site. Easypump Concrete Ltd will confirm whether a boom pump can work safely, recommend a line pump where it cannot, and give you a clear, no-obligation price either way.
Call 01582 550287 or email admin@easypump.co.uk to book a site assessment for your next concrete pour in London, Hertfordshire or the surrounding counties.