What must be complied with if the utility supply system is ungrounded and connected on the supply side of a service disconnect?

When a utility supply system is ungrounded and connected on the supply side of a service disconnect, it is essential to comply with the requirements of 250.25(B). This section specifically addresses the grounding of ungrounded systems, which is critical for ensuring safety and minimizing the risk of electric shock or equipment damage.

In an ungrounded system, the grounding and bonding practices become particularly crucial because of the potential for high voltage to appear on exposed conductive parts if there is a fault. The provisions outlined in 250.25(B) provide guidelines on how to manage these ungrounded systems safely and effectively, focusing on the necessary grounding methods to mitigate hazards associated with various fault conditions.

Understanding these requirements is vital for professionals working with electrical systems, as adherence ensures compliance with safety protocols and helps maintain a reliable electrical infrastructure.