A 2 inch horizontal copper pipe shall be supported at _________ foot intervals.

The correct supporting interval for a 2-inch horizontal copper pipe is indeed ten feet. This specification is based on plumbing codes that ensure pipes are adequately supported to prevent sagging, bending, and potential damage over time. Proper support is crucial for maintaining the integrity of the plumbing system, as unsupported pipes can lead to wear and tear, leaks, or even system failures.

Ten-foot intervals are established to create a balance between material usage and sufficient support. This interval allows for easy installation and maintenance while providing the necessary stability for the piping system. Copper pipes, known for their durability and resistance to corrosion, still require careful adherence to support codes to ensure their longevity and functionality in a plumbing system.