What does a dashed line typically represent in MEP drawings?

In MEP drawings, a dashed line typically represents hidden lines or features that are not visible from the current view. These dashed lines indicate elements that are present in the design but cannot be seen directly due to their position or relationship with other components. For instance, in a mechanical or electrical layout, the dashed lines might depict pipes, ducts, or conduits that run behind walls or above ceilings. This allows engineers and contractors to understand the full scope of the installation while recognizing that certain elements are obscured from direct sight.

Understanding this representation is crucial for accurate interpretation of plans and for ensuring that installations proceed correctly according to the intended design. This clarity in communication helps prevent potential errors during construction or modification, as all components—including those not immediately visible—are accounted for in the planning stages.