Conduits or raceways that may have moisture contact with live parts should be:

For conduits or raceways that may come into contact with moisture and carry live parts, sealing and plugging is essential to prevent moisture intrusion and corrosion that could lead to electrical failures or hazards. Sealing these conduits helps to create a barrier against moisture, while plugging ensures that any entry points are securely sealed to prevent any potential water infiltration.

This practice aligns with the need for maintaining safe electrical installations by minimizing the risk of short circuits, equipment damage, or electric shock associated with moisture exposure. In areas where moisture is a concern, this sealing practice is vital for ensuring the longevity and safety of electrical systems.

Other options, while they may include considerations for moisture control, do not effectively mitigate the risks associated with moisture presence. Open ventilation could allow moisture entry, drainage holes might not sufficiently prevent moisture accumulation, and sealing at both ends may not account for any potential moisture that could accumulate within the conduit itself without proper sealing and plugging.