How should unused openings in electrical equipment be treated according to Section 110.12(A)?

Unused openings in electrical equipment should be treated by sealing them, as stated in Section 110.12(A). This requirement is crucial for several reasons. First, sealing unused openings helps to prevent the ingress of dust, moisture, and other contaminants that could damage internal components or create unsafe conditions. Openings that are not properly sealed could also potentially allow for the escape of electrical arcing or overheating, in turn leading to hazardous situations such as short circuits or electrical fires.

Sealing ensures that the equipment maintains its integrity and operational safety by protecting it from environmental factors. This adherence to proper sealing practices is reflective of a commitment to maintaining equipment in compliance with safety standards, ensuring durability and reliability over time. Such practices are essential for safeguarding not only the longevity of the equipment but also the safety of personnel who operate or work near the equipment.