What is the maximum length of flexible metal conduit that can be used without a ground?

What is the maximum length of flexible metal conduit that can be used without a ground?

• A. 3 feet
• B. 6 feet
• C. 10 feet
• D. 12 feet

Answer: (B)

The maximum length of flexible metal conduit (FMC) that can be used without a separate grounding conductor is 6 feet. This regulation ensures that electrical installations maintain proper grounding for safety and performance reasons. FMC is typically used in areas where flexibility is needed, but it must still provide adequate grounding protection to prevent electrical shock and ensure equipment safety. If the length exceeds 6 feet, it is generally required to be grounded through a separate means to comply with the National Electrical Code (NEC). Therefore, the correct answer reflects the specified limit set by the code for flexible metal conduit installations where grounding is not provided through the conduit itself.