When installing a copper pipe that passes through a concrete slab, what must be done to protect the pipe?

Question: When installing a copper pipe that passes through a concrete slab, what must be done to protect the pipe?

Answer options:

• The pipe must be wrapped in a single layer of duct tape. ✅ The pipe must be sleeved or wrapped to prevent direct contact with the concrete.
• The pipe must be heated before the concrete is poured around it.
• No special protection is needed if it's Type L copper.

Correct answer: The pipe must be sleeved or wrapped to prevent direct contact with the concrete.

Explanation: Direct contact between copper and uncured concrete can cause a chemical reaction that corrodes the copper. The NPC requires that the pipe be protected by a sleeve or an approved wrapping material to isolate it from the concrete and allow for thermal movement.