Washington Administrative Code(WAC) and Revised Code of Washington (RCW) Electrical Practice Exam

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Can EMT be installed in direct contact with the earth or in concrete?

May
Shall Not
Must
Sometimes

The correct answer is: Shall Not

The correct answer indicates that EMT (Electrical Metallic Tubing) must not be installed in direct contact with the earth or in concrete. This requirement stems from safety considerations that are detailed in the National Electrical Code (NEC) and reinforced by local codes, such as the Washington Administrative Code. EMT is often used for raceways and is generally not considered suitable for environments where it may be exposed to corrosive elements or where moisture can penetrate. When installed directly in the ground or within concrete, EMT is at risk of corrosion, which can compromise the integrity of the raceway over time. The NEC specifies that raceways submerged in concrete or directly contacting soil should be corrosion-resistant materials to ensure the longevity and safety of the electrical system. By preventing EMT from being installed in such conditions, the regulation aims to maintain the reliability and safety of electrical installations, mitigating risks associated with physical damage and electrical failures.