The maximum permitted distance between labels on copper tube used for medical gas and vacuum systems is how many feet?

The maximum permitted distance between labels on copper tube used for medical gas and vacuum systems is how many feet?

• A. 10 feet
• B. 20 feet
• C. 30 feet
• D. 40 feet

Answer: (B)

Labels identify what gas is in the line, where it comes from, and help prevent connecting the wrong gas or making unsafe changes. Because piping often runs long distances and may bend through walls or ceilings, the system requires a label to be visible within a reasonable distance so anyone inspecting or working on the line can quickly verify its contents. Setting the maximum distance at twenty feet ensures you won’t have long stretches without a label, even along extended runs or around corners, while keeping the labeling practical to install and maintain. Labels are also placed at transitions, near outlets, and by valves to reinforce correct identification throughout the system. Distances shorter than this would add unnecessary labeling, whereas longer distances could create gaps in identification and increase the risk of misidentification.

Labels identify what gas is in the line, where it comes from, and help prevent connecting the wrong gas or making unsafe changes. Because piping often runs long distances and may bend through walls or ceilings, the system requires a label to be visible within a reasonable distance so anyone inspecting or working on the line can quickly verify its contents. Setting the maximum distance at twenty feet ensures you won’t have long stretches without a label, even along extended runs or around corners, while keeping the labeling practical to install and maintain. Labels are also placed at transitions, near outlets, and by valves to reinforce correct identification throughout the system. Distances shorter than this would add unnecessary labeling, whereas longer distances could create gaps in identification and increase the risk of misidentification.