The measurement used for ACR copper tubing?

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Multiple Choice

The measurement used for ACR copper tubing?

Explanation:
Outer diameter is the measurement used for ACR copper tubing. In HVAC/R, tubing sizes are defined by the outside diameter because fittings, flares, and connections are designed to grip and mate with the tube’s exterior. The inner diameter would vary with wall thickness, so it wouldn’t reliably indicate fit or pressure rating. Wall thickness is specified separately (types K, L, M) to indicate strength, while nominal size is a different convention used in plumbing, not for ACR tubing sizing.

Outer diameter is the measurement used for ACR copper tubing. In HVAC/R, tubing sizes are defined by the outside diameter because fittings, flares, and connections are designed to grip and mate with the tube’s exterior. The inner diameter would vary with wall thickness, so it wouldn’t reliably indicate fit or pressure rating. Wall thickness is specified separately (types K, L, M) to indicate strength, while nominal size is a different convention used in plumbing, not for ACR tubing sizing.

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