Transformers with ventilating openings must be installed so that the openings are not blocked by walls or obstructions. The required clearance shall be maintained on which surfaces?

Transformers with ventilating openings must be installed so that the openings are not blocked by walls or obstructions. The required clearance shall be maintained on which surfaces?

• A. Front Only
• B. Top, Bottom, and All Sides
• C. Top Only
• D. Bottom Only

Answer: (B)

Clearance around transformers for ventilating openings is needed on all surfaces to ensure proper cooling. The openings allow heat to escape and cooler air to flow in, so any wall or obstruction blocking any face reduces that airflow. By keeping space on the top, bottom, and all sides, air can circulate freely in every direction, preventing heat buildup and protecting the transformer's insulation and service life. Blocking just one surface can create heat pockets and impair cooling, which is why the required clearance applies to top, bottom, and all sides.

Clearance around transformers for ventilating openings is needed on all surfaces to ensure proper cooling. The openings allow heat to escape and cooler air to flow in, so any wall or obstruction blocking any face reduces that airflow. By keeping space on the top, bottom, and all sides, air can circulate freely in every direction, preventing heat buildup and protecting the transformer's insulation and service life. Blocking just one surface can create heat pockets and impair cooling, which is why the required clearance applies to top, bottom, and all sides.