If you have a motor that must remain adaptable to several sizes of belts what is the maximum length of flexible metal conduit you can use before the counduit requires fastening?

According to the National Electrical Code (NEC), flexible metal conduit (FMC) must be secured at intervals not exceeding 12 feet and within 3 feet of each termination point. Therefore, the maximum length of flexible metal conduit you can use before it requires fastening is 12 feet. For proper support and to ensure safety, it's important to adhere to these guidelines.