Dry-type transformers rated over which voltage must be installed in a vault?

Dry-type transformers that are rated over 35,000 volts must be installed in a vault to ensure safety and compliance with electrical standards and regulations. This requirement is in place due to the potential hazards associated with high-voltage equipment.

Transformers operating at higher voltages can produce significant electrical arcs and sparks, increasing the risk of fires or electrical shock in the event of a failure or malfunction. By confining these transformers within a vault, it creates a controlled environment that enhances safety by protecting personnel from exposure to high voltage and limiting potential damage to surrounding areas.

Furthermore, this practice aligns with the National Electrical Code (NEC) and other regulatory standards that stipulate the necessary precautions and installations for high-voltage electrical equipment to mitigate risks. This makes the installation of dry-type transformers in a vault for those rated over 35,000 volts not just a safety measure, but a requirement for effective risk management in electrical installations.