Independent Electrical Contractors (IEC) 2A Practice Exam

The maximum distance permitted between supports for MC (Metal Clad) cable is specified by the National Electrical Code (NEC) to ensure safety and support for the cable, reducing the risk of damage and maintaining system integrity. The correct answer identifies that the permissible distance is 6 feet.

This distance is established to prevent strain on the cable and to ensure that it remains securely fastened along its run. If spaced too far apart, the cable could sag or become exposed, which could lead to mechanical damage or issues with operation safety, such as electrical shorts or insulation degradation.

In summary, the stipulation of a 6-foot maximum spacing between supports reflects the NEC's focus on safety, installation integrity, and the minimized risk of potential hazards associated with unsupported or inadequately supported cables.