Which conduit type is typically used for emergency lighting circuits?

Emergency lighting circuits require a conduit type that offers strength, fire resistance, and the ability to withstand environmental factors. EMT, or Electrical Metallic Tubing, is commonly used for these applications due to its metallic construction, which provides excellent protection against physical damage and enhances grounding capabilities.

EMT's lightweight nature makes it easy to install, while its rigid form ensures that it maintains integrity over time, especially in emergency situations where reliability is critical. Additionally, EMT is non-combustible and can help in meeting safety codes that pertain to emergency systems, ensuring that the lighting remains functional even in adverse conditions.

Flexible conduit, while versatile, often lacks the necessary physical protection required under emergency scenarios. Intermediate metal conduit is stronger but may be overkill in less demanding applications and tends to be heavier and more cumbersome to work with. PVC conduit, while resistant to moisture and corrosion, does not meet the fire-resistance requirements essential for emergency lighting systems.