What is the main disadvantage of using EMT in areas exposed to moisture?

Using Electrical Metallic Tubing (EMT) in areas exposed to moisture poses a significant disadvantage due to corrosion risk. EMT is made of metal, and when it is exposed to moisture over time, it can be susceptible to rust and corrosion, which can lead to deterioration of the conduit and potentially compromise the integrity of the electrical system it protects. This is an important consideration in environments such as basements, outdoors, or any region where humidity levels are high or water exposure is likely.

While other factors such as cost, difficulty in bending, and weight considerations may play a role in certain applications of EMT, the critical issue in moisture-prone environments is the long-term impact of corrosion. Corrosion can weaken the tubing and connections, leading to potential safety hazards, electrocution risks, or failures in the electrical system due to compromised conduit. Therefore, understanding the implications of using EMT in these settings is vital for proper electrical installation and safety.