Why the distinction matters
If a project is specified using the wrong measurement, the machine can be unnecessarily large or unable to put the operative in the right position.
Measure the task, not only the building
The highest point of a building is not always the work point. Identify where hands, tools or materials need to reach and where the machine can stand.
Add outreach and obstacles
For boom-type equipment, vertical height is only one dimension. Horizontal distance and obstructions often determine the practical machine requirement.
Give suppliers context
A site photograph, drawing or clear description of the work position can be more valuable than an uncertain machine model request.
Use one clearly defined measurement in the enquiry
If the project team already has a dimension, state what it represents: platform floor level, operator hand position, underside of a structure or another work point. Avoid sending a single height figure without context. The same number can describe very different tasks, especially where the operative needs to work above, below or beside the measured point.
Height does not replace reach geometry
For boom-type access, a machine can have adequate headline height and still be unable to reach the job from the available standing position. Record horizontal distance and obstacles as well as vertical height. Where measurements are uncertain, photographs, drawings and a description of the proposed machine location can help a supplier interpret the requirement more accurately.
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