The Overhead Line Near the Grain Store
You are the telehandler operator on a farm improvement project. Your task is to move 1.2 t pallets of block paving from a delivery area to a stockpile beside a new grain store. The only practical route runs beneath an 11 kV overhead line that crosses the yard at a height the site surveyor has measured as 5.8 m at the lowest point. Your machine is a 14 m reach model with a transport height of 2.6 m and a maximum lift height of 13.5 m. The delivery driver is waiting and the foreman tells you 'just keep the boom down and you'll be fine - we've done it before.' A second route around the far side of the store adds roughly six minutes per trip and passes over soft ground that has not been assessed.
1. Identify the hazard controls that apply here and explain whether the foreman's instruction is acceptable.
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The overhead line is the controlling hazard. Even with the boom fully lowered, the machine plus load and any raised boom creates a risk of contact or flashover; electricity can arc across an air gap, so 'keeping the boom down' is not a control.
Controls, in the correct order:
- Eliminate/avoid - find a route that does not pass under the line. The soft-ground route must be assessed for bearing capacity and slope before use, not assumed unsafe or safe.
- If avoidance is impossible, isolate the line (arrange with the electricity supplier for diversion or isolation) or limit the machine with a goalpost barrier and a defined safe clearance distance.
- Warn - signs at the crossing point, and a banksman aware of the line.
- Never rely on the operator's judgement of clearance alone; a measured clearance of 5.8 m gives no margin once the boom is raised, and the load itself adds height.
The foreman's instruction is not acceptable. It is a verbal control that overrides a physical hazard, it is based on habit rather than assessment, and it places the operator in a position where a momentary error is fatal. The operator should stop, raise the concern, and not proceed until a documented control (diversion, isolation, or a barrier with a safe route) is in place.
2. The soft-ground bypass has not been assessed. What information would you need before using it, and what would make you refuse?
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Before using the bypass I would need:
- A ground assessment (or at least a competent person's judgement) of bearing capacity for the loaded machine - the telehandler's operating weight plus a 1.2 t load, distributed over four wheels, is far greater than a car.
- Confirmation of any buried services, drains, or excavations along the route.
- Slope and camber measurements; a telehandler is least stable with the boom raised or extended, and side slopes are the worst case.
- Overhead obstructions and clearance along the new route.
- A defined turning and unloading area at the far end.
I would refuse if: the ground shows signs of previous rutting or collapse, there are unmarked services, the slope exceeds what the machine's manual permits, or no one competent can confirm the route. The six-minute saving is irrelevant against the risk of an overturn; the correct answer is to stop and get the route assessed rather than to guess.