What is the maximum size allowed for intermediate metal conduit?

The maximum size allowed for intermediate metal conduit (IMC) is trade size 4. This limitation is established in electrical code standards, which define IMC as a lightweight, robust metallic conduit option for various applications, including indoor and outdoor installations.

Trade size 4 represents the largest nominal diameter allowed for IMC, making it suitable for a range of wiring systems while ensuring structural integrity and ease of installation. Larger conduits, such as trade size 5, are categorized differently and generally fall under other conduit types, such as rigid metal conduit (RMC), which have larger size specifications for increased capacity and strength.

Understanding the specifications for conduit types is essential for compliance with safety codes and effective installation practices in electrical projects. This ensures that the appropriate conduit is used for the given application, taking into consideration factors such as wire size, environmental conditions, and mechanical protection requirements.