What is the maximum distance for required support for rigid steel conduit from the service head?

The correct answer is that the maximum distance for required support for rigid steel conduit from the service head is 3 feet. This requirement is outlined in the National Electrical Code (NEC) and is important for ensuring the stability and integrity of the conduit system.

Supporting rigid steel conduit at appropriate intervals prevents sagging and minimizes the risk of damage due to environmental factors or mechanical stress. The 3-foot requirement is a standard measurement that helps maintain a safe and functional electrical installation.

Understanding this distance is crucial for any electrical professional working on service entrances, as proper support ensures not only compliance with regulations but also the overall safety and reliability of the electrical system.