What should be done with unused openings in electrical equipment?

Unused openings in electrical equipment should be closed to protect against damage. This practice is essential for maintaining the integrity and safety of the electrical system. When openings are left unsealed, they can allow dust, moisture, and foreign objects to enter the equipment, which may lead to malfunctions, create hazards, or compromise the system’s safety features.

Closing these openings effectively helps prevent environmental factors from adversely affecting the internal components of electrical equipment, thereby ensuring a reliable operation. The National Electrical Code emphasizes that proper sealing is critical for the safe functioning of electrical installations.