EMT must be supported within how many feet of every outlet or box?

The correct answer is that EMT, or Electrical Metal Tubing, must be supported within 3 feet of every outlet or box. This requirement is outlined in the National Electrical Code (NEC) to ensure that the conduit is properly supported and does not sag or become disconnected, which can lead to damaged wiring or electrical hazards.

Supporting EMT within this distance helps maintain the integrity of the electrical system, ensuring that connections are secure and reducing the risk of physical damage to the tubing itself. Proper support also contributes to a safer installation by minimizing the risk of electrical shorts or failures caused by strain on the conduit between connections. Therefore, the requirement for support every 3 feet is crucial for effective installation and long-term reliability of the electrical system.