What NEC reference permits the use of steel threaded rigid couplings with aluminum rigid metal conduit?

The National Electrical Code (NEC) provides guidelines for the proper use and installation of electrical conduits to ensure safety and efficiency. The reference that specifically addresses the use of steel threaded rigid couplings with aluminum rigid metal conduit is found in section 344.14.

This section details the requirements for the installation of rigid metal conduit (RMC), including approval for the use of different materials in conjunction with one another. Using steel threaded rigid couplings with aluminum rigid metal conduit is permissible under these guidelines, as it ensures a secure electrical connection while maintaining the integrity of the overall conduit system. This approach allows for the benefits of using aluminum, such as lightweight and corrosion resistance, while still providing the mechanical strength of steel in couplings.

Moreover, understanding the interaction between different materials is essential, as it relates to corrosion prevention and the longevity of the conduit system. The NEC is aimed at promoting safe and effective electrical installations, and referencing these specific regulations helps in achieving compliance with those standards.