Md. Code, Public Safety § 12–206

(a) This section applies to any building that uses fuel gas piping systems not subject to Title 49, Part 192 of the Code of Federal Regulations.

(b) Non–arc–resistant jacketed corrugated stainless steel tubing may not be used in:

(1) the new construction of a customer–owned natural gas or liquefied propane piping system in a building;

(2) a natural gas or liquefied propane piping system in a renovated property if the renovation affects more than 50% of the total square footage of the property; or

(3) a natural gas or liquefied propane piping system that requires the addition of a new gas line to the gas piping system.

(c) A person who violates this section is subject to a civil penalty not exceeding $1,000.