Yes, the transformer requires a disconnect.

According to the National Electrical Code (NEC) Article 450.13(B) and (C), a transformer must have a disconnecting means to allow for safe servicing and maintenance.

Justification



Safety

To isolate the transformer from power sources for maintenance or repairs.

Maintenance

To allow authorized personnel to work on the transformer without risking electrical shock or other hazards.

Emergency

To quickly de-energize the transformer in an emergency, such as a fire or equipment failure.

Location of Disconnect

The disconnect should be installed at a readily accessible location, such as: On or next to the transformer enclosure On the wall or ceiling adjacent to the transformer In the 220v panel that the transformer is feeding (if it complies with NEC Article 450.14)

Type of Disconnect

The disconnect can be a circuit breaker, fused switch, or other approved means of disconnecting power. It should have a rating that is appropriate for the transformer's voltage and current capacity.

Additional Considerations: The disconnect should be labeled to indicate its purpose and the equipment it controls. The disconnect should be interlocked with the transformer's primary circuit breaker or switch to ensure that the primary power is disconnected before the transformer can be isolated.* The transformer should be grounded in accordance with NEC requirements. Flag for review