_____ fittings shall not be used.

Prepare for the North Carolina Mechanical Code Exam with questions, flashcards, and explanations to boost your confidence. Master the code and increase your chances of passing!

Cast-iron fittings are prohibited due to their susceptibility to corrosion and brittleness over time, especially in environments where moisture or chemicals may be present. The use of cast-iron components can lead to structural integrity issues within plumbing or mechanical systems, resulting in potential leaks or failures.

In contrast, other materials like brass, plastic, and aluminum have specific applications where they perform well and meet standards for durability and resistance to corrosion. Brass and aluminum are often used for their strength and corrosion resistance, while plastic fittings offer lightweight and flexible options for various systems. Hence, the focus on avoiding cast-iron fittings is rooted in promoting safety and reliability in mechanical installations.

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