What requirement exists regarding the installation of dry-type transformers near combustible materials?

The requirement that dry-type transformers must be greater than 12 inches away from combustible materials is grounded in safety practices outlined in the National Electrical Code (NEC). This distance is crucial to prevent the risk of heat from the transformer igniting those materials. Dry-type transformers can generate heat during operation, and an appropriate clearance helps to mitigate the potential for fire hazards.

In addition, maintaining this distance ensures that there is adequate airflow around the transformer for cooling, reducing the chance of overheating. Furthermore, the NEC considers various factors such as the transformer's rating and the specific environment in which the transformer is placed when establishing these requirements. Therefore, adhering to a clearance greater than 12 inches is essential for promoting safety and compliance with electrical standards.