Soft Fill, a 12% Slope, and a 12.5 kV Line Over the Only Truck Access
You are setting up to unload a 2,300 lb pallet of masonry units from a flatbed at a new single-family lot. The only truck access is a gravel drive on the north side. A 12.5 kV overhead distribution line runs parallel to that drive; at the pole it measures about 16 ft above grade and it sags visibly toward mid-span. The ground where the truck is parked slopes about 12% toward the street, and the spot where you would set the rear stabilizer sits over a backfilled septic tank. Yesterday's tire ruts there are 6 in deep and a screwdriver pushes 8 in into the soil. The builder wants the pallet landed on a 4-ft-high porch slab on the south side, roughly 18 ft of radius from where the machine can sit. Wind is 5 mph. The general contractor says the utility 'never energizes that line until the subdivision is finished.'
1. Evaluate the ground where you would set up. What must you verify, and what is your plan?
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Treat that area as unsuitable until proven otherwise. Six-inch ruts from a previous pass plus a screwdriver going 8 in means loose, possibly voided fill over a buried tank, and a stabilizer concentrates thousands of pounds on a small pad. If it punches through, the machine lists, and on a 12% slope a list becomes a tip-over. Plan: (1) locate and mark the tank and drainfield limits, and set up over neither; (2) if there is no other position, use engineered fill or crane mats and size them from an estimate of the stabilizer load - a 4 ft x 4 ft mat is 2,304 in², so 6,000 lb on it is about 2.6 psi, which is only acceptable if the fill can take it; (3) prefer a position on the firm gravel where you can level the frame within the manual's limit; (4) confirm level with the indicator, not by eye, before any load leaves the ground. Set the stabilizers on pads, not directly on gravel. If you cannot establish bearing or level, the lift does not happen here.
2. What is your power-line plan, and does the 'not energized yet' claim change anything?
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Treat the line as energized. Under the OSHA crane power-line rules the minimum approach distance for lines rated 50 kV or less is 10 ft, and many telehandler manuals use the same or a more conservative figure - check the decal and manual. The 10 ft applies to the machine, boom, load, rigging and any tag line, measured to the closest possible point, accounting for line sag and boom deflection. Sixteen feet at the pole with visible sag can be considerably lower at mid-span. The controlling conflict here is that the truck is parked under the line, so unloading puts the boom and load inside the zone. Options, in order: have the driver reposition the truck outside the zone; ask the utility to de-energize and ground, confirmed in writing; barricade and use a spotter who also stays clear. The 'never energized yet' claim changes nothing - a GC's verbal assurance is not verification, and only the utility can confirm status.
3. The porch landing needs roughly 18 ft of radius. How does that interact with the setup decision?
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Radius drives capacity, and capacity at 18 ft will be well below the machine's nominal rating - read the actual chart, including any stabilizer or frame-leveling requirement. But the decision order is: safety of the setup first, then geometry. If the only position that reaches 18 ft puts the boom or load inside the 10-ft zone of the line, or puts a stabilizer over the septic fill, you do not take that position and you do not shorten the radius by crowding the line. Real options are to relocate the landing point (set the pallet on the ground on the south side and let the masons move it), bring in a machine with more reach from a safe setup, or have the utility clear the line. Reaching farther to avoid moving the truck is exactly the trade that produces contact incidents.