What does “EL” mean in the drawing?

Thread Content

““EL elevation” usually refers to the height above a reference level; it is an abbreviation for Elevation. In the engineering field, this term is used to indicate the vertical height of a point relative to a baseline, and it serves to determine the vertical position of buildings, pipelines, or equipment. Its reference point is not fixed and needs to be determined based on the type of project and the drawing specifications. The introduction will follow. 1. The core meaning and the concept of elevation relative to a reference level EL are centered on \"reference + height\". There are two common types of reference levels: 1) Absolute elevation (Yellow Sea elevation): It uses the average sea level in the Yellow Sea off Qingdao in China as the reference level, with the elevation value representing the vertical distance from that point to the sea level. For example, “EL 100.50m” indicates that the point is 100.50 meters above the Yellow Sea sea level, and it is commonly used in macro scenarios such as building layouts and road planning. 2) Relative elevation (±0.000 elevation): A specific plane (such as the floor of the building’s ground floor) is used as the reference level, set at ±0.000; values above this reference level are positive, while those below it are negative. For example, “EL +3.20m” indicates that the point is 3.20 meters above the ground level of the first floor; it is primarily used in detailed design for the internal structure of buildings and equipment installation.