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

The maximum distance for required support for rigid steel conduit from the service head is 3 feet. This requirement is established by the National Electrical Code (NEC), which governs the installation of electrical systems to ensure safety and efficiency. Rigid steel conduit, due to its weight and structural properties, needs adequate support to prevent sagging and ensure that electrical conductors within remain safe and secure.

Providing support at a maximum of 3 feet helps to maintain the integrity of the conduit, prevents potential damage that might occur from unsupported lengths, and ensures compliance with electrical installation standards. This distance allows for flexibility in installation while still adhering to safety norms crucial for an effective electrical system.