In a 6' length of FMC, which supports can be omitted?

In a 6-foot length of Flexible Metal Conduit (FMC), the code allows for certain supports to be omitted depending on the length and type of installation. The National Electrical Code (NEC) specifies that FMC must be supported at specific intervals, but for short lengths, there is flexibility regarding which supports can be omitted.

When the installation involves a run of 6 feet, typically, it consists of various support requirements that can be omitted for this specific length. In this case, options that suggest omitting supports #1, #2, and #3 indicate that none of the specified supports are necessary for a 6-foot run. This allowance is based on the understanding that such shorter lengths can be adequately supported by the device it terminates to, like a junction box or other equipment, which is itself securely attached to the structure.

Therefore, the correct answer indicates that all specified support types can be omitted in a 6-foot run of FMC, conforming to NEC guidelines while ensuring both safety and structural integrity. Understanding these principles is critical for compliance with electrical codes and ensuring installations are performed correctly.