Substation design typically calls for 2-6” of aggregate (crushed rock) as a top layer upon completion of construction. This layer serves several purposes, including improved vehicle access, reduced erosion, and suppression of vegetation. Another significant function of this layer is to provide personnel safety by increasing the allowed (maximum permissible) touch and step potential values versus native soil. When the aggregate becomes a critical part of the site’s safety, knowledge of the aggregate’s composition and...
Read More
