What determines the depth of a conduit duct bank?

The depth of a conduit duct bank is primarily determined by the conductor voltage. Higher voltages often necessitate deeper installations to ensure safety, regulatory compliance, and to minimize the risk of electrical interference or hazards. Adequate depth can help in providing necessary insulation and reducing exposure to environmental factors that may affect the electrical properties of the conductors.

While other factors like soil type, pipe material, and the risk of flooding may influence the overall design and placement of a duct bank, they do not primarily dictate the depth. Soil type can affect the stability of the installation, pipe material can influence durability, and the risk of flooding may lead to modifications in placement, but it is the voltage that primarily drives the decision for how deep the conduits should be buried to meet safety and performance standards.