Electrical Metallic Tubing and Rigid Metal Conduit Quiz

What is one of the conditions for which electrical metallic tubing (EMT) should not be used?

Which type of fill should electrical metallic tubing (EMT) not be used with?

According to the PEC, EMT should not be used in which type of hazardous location?

What is the third classification of hazardous location based on the PEC?

Why should electrical metallic tubing (EMT) not be exposed to corrosive fumes?

Which type of area is considered a Class II hazardous location?

What happens when cinders from coal burning furnaces get wet?

What is the primary reason for not using EMT in areas with flammable gases and vapors?

What is the potential consequence of exposing electrical metallic tubing (EMT) to extreme heat?

What is one effect of subjecting electrical metallic tubing (EMT) to mechanical disturbance during or after construction?

Conditions for EMT Usage

Electrical metallic tubing (EMT) should not be used in areas subject to corrosive fumes, as this can lead to deterioration.
EMT is not suitable for abrasive or hazardous environments where it can be physically damaged or corroded.

Types of Fill and Hazardous Locations

EMT should not be used with certain types of cable fill, particularly those that are moisture-laden or can retain water, leading to potential electrical hazards.
According to the National Electrical Code (NEC) and the PEC, EMT is prohibited in Class I hazardous locations which involve flammable gases or vapors.

Classification of Hazardous Locations

The third classification of hazardous location is Class III, which encompasses areas with combustible dust.

Impact of Cinders and Corrosion

When cinders from coal-burning furnaces get wet, they can create a hazardous condition by producing a corrosive environment that can affect EMT integrity.

Flammable Gases and EMT

The primary reason for avoiding EMT in areas with flammable gases and vapors is the risk of ignition and potential explosions due to the tubing not being designed to contain or prevent escape of ignition sources.

Consequences of Extreme Heat

Exposing EMT to extreme heat can compromise its structural integrity, possibly leading to deformation or failure of the conduit system.

Mechanical Disturbance Effects

Subjecting EMT to mechanical disturbances during or after construction can result in damage or misalignment, compromising the safety and reliability of electrical installations.

Test your knowledge about the usage and limitations of electrical metallic tubing (EMT) and rigid metal conduit. Learn about the conditions under which EMT should not be used, and the factors that can cause damage to it.