Which of the following conditions must indoor switchgear be protected against?

Indoor switchgear must be protected against moisture to ensure its reliable operation and to prevent damage to the electrical components. Moisture can lead to corrosion, short circuits, and poor insulation resistance, which can compromise the safety and functionality of the switchgear.

In industrial environments, where switchgear is often exposed to various operating conditions, moisture can not only originate from external sources like humidity and leaks but can also result from condensation within the equipment. Controlling moisture levels through proper housing, sealing, and environmental controls helps maintain optimal performance and longevity of the switchgear.

While heat, dust, and vibration can also impact the functioning of electrical equipment, the primary concern for indoor switchgear remains its susceptibility to moisture, as moisture poses a significant risk for electrical failures and operational hazards.