The required burial depth for electrical raceways is a critical aspect of electrical system installation. This depth, typically measured in inches or feet, refers to the distance from the top of the conduit to the finished grade of the soil. For example, a rigid metal conduit (RMC) may require a different minimum burial depth compared to a nonmetallic conduit (PVC).
Adhering to appropriate burial depths protects electrical conductors from physical damage, environmental factors, and potential hazards like digging or construction activities. It also helps ensure the long-term reliability and safety of the electrical system. Regulations have evolved based on historical incidents and research aimed at minimizing electrical faults and maintaining public safety.