What is the maximum length of installed flexible metal conduit?

• A. 3 meters / 10 feet
• B. 9 meters / 30 feet
• C. 12 meters / 40 feet
• D. 6 meters / 20 feet

Answer: (D)

Flexible metal conduit is intended for short, flexible connections rather than long raceway runs. Because of its construction and the way fittings are rated, there is a code-specified limit on how long a single run of FMC can be installed. That limit helps ensure the conductors stay properly protected, the fittings remain within their listed performance, and practical issues like pull tension and ease of installation don’t compromise the installation. The maximum per-run length for installed flexible metal conduit is 20 feet (about 6 meters). If you need a longer run, use a rigid or semi-rigid raceway for the straight portions and only use FMC for short flexible connections near devices or equipment.