Excavator Exclusion Zones

An excavator exclusion zone is the defined area around an operating excavator where pedestrians must not enter.
Being struck by a moving excavator or its slewing superstructure is one of the top causes of construction fatalities.
The exclusion zone extends to the full reach of the boom, arm, and bucket plus a safety margin of at least one metre.
PUWER 1998 requires employers to ensure that people are not exposed to risks from moving work equipment.
Operators have limited visibility from the cab — blind spots exist to the rear, sides, and close to the tracks.
Physical barriers such as cones, fencing, or goal posts must mark the exclusion zone wherever practicable.
A banksman or designated signaller is required when pedestrians must work near an operating excavator.
The risk increases significantly during slewing — the tail swing on a 360 excavator can extend well beyond the tracks.
Near-miss incidents involving excavators and pedestrians are among the most frequently reported on UK sites.
Every excavator briefing must confirm the exclusion zone, communication method, and safe approach procedure.

Prevent fatalities	Being struck by an excavator is almost always fatal or life-changing — the forces involved are enormous and instantaneous.
Operator blind spots	Even with mirrors and cameras, operators cannot see directly behind or beside the machine at close range.
Legal duty	Failing to segregate pedestrians from moving plant breaches CDM 2015 and PUWER 1998, resulting in enforcement action.

Do

Don't

Establish and mark the exclusion zone before the excavator starts any operation.
Use physical barriers, goal posts, or cones to define the zone boundary clearly.
Make eye contact with the operator and receive a positive signal before approaching.
Wait until the machine has stopped slewing and the bucket is grounded before entry.
Use the designated safe approach route agreed with the operator at the task briefing.
Wear high-visibility clothing at all times when working near any excavator operation.
Appoint a banksman when pedestrians must work within the exclusion zone temporarily.
Brief the excavator operator on all ground worker positions and planned movements.
Maintain radio or visual communication between the operator and ground workers at all times.
Stop work and reassess if conditions change and the exclusion zone cannot be maintained.

DON'T enter an excavator exclusion zone without the operator's direct acknowledgement.
DON'T walk behind or beside a slewing excavator — the tail swing can strike without warning.
DON'T assume the operator has seen you because you can see the cab from your position.
DON'T remove or reposition exclusion zone barriers without the supervisor's approval.
DON'T work under a raised bucket, arm, or any suspended load from an excavator.
DON'T use a mobile phone or earphones near operating excavators on site.
DON'T take shortcuts through an active excavation area to save time between work fronts.
DON'T allow vehicles to park within the slew radius of an operating excavator.
DON'T rely solely on the excavator's reversing alarm as your only warning system.
DON'T continue working if the agreed banksman leaves the area without a replacement.

See also: Plant and Pedestrian Segregation | 360 Excavator Safety

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