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Plumbing Codes & Regulations – 120+ KY Exam Questions with Answers – Licensing, DWV, Backflow, Permits – PLMB 402

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This focused exam prep document features over 120 multiple-choice and code-based questions with verified answers, designed specifically for students and professionals preparing for the 2025/2026 Kentucky Journeyman Plumbing Exam or enrolled in PLMB 402 (Plumbing Codes & Regulations) or similar courses. The material follows state-specific plumbing codes and regulatory standards, offering a clear and structured overview of licensure conditions, penalties, required inspections, installation rules, and safety compliance. Topics include essential knowledge of cleanout sizing and placement, DWV (Drainage, Waste, and Vent) systems, plumbing permits, plumbing material specifications, fixture connection requirements, backflow protection devices, and minimum pipe sizing and layout. The guide also highlights procedures around thermal expansion, air gaps, trap seals, water heater safety valves, and detailed backflow control per ANSI and ASTM standards. Kentucky-specific administrative rules (such as license suspension, inspections, and committee structure) are included for compliance understanding. This document is best suited for: Journeyman plumber candidates preparing for the Kentucky state license exam Technical and community college students enrolled in plumbing code or inspection-related courses Apprentices in vocational plumbing training Code inspectors and facilities managers seeking to deepen familiarity with KY plumbing law and enforcement procedures Instructors and exam coaches creating assessments or delivering state-aligned instruction Practical, accurate, and state-specific, this document serves as both a testing aid and real-world reference. Keywords: Kentucky plumbing exam, PLMB 402, journeyman plumber 2025, plumbing license requirements, DWV system codes, backflow valve, air gap regulations, cleanout fittings, water service depth, trap seal code, plumbing permit rules, ANSI plumbing standards, ASTM fittings, water heater code KY, cross connection control

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Journeyman Plumbing Codes –KY
2025/2026 Exam Questions and Answers
| A+ Score Assured



An applicant who fails an examination shall be eligible upon _______ for

the next regular exam. - 🧠 ANSWER ✔✔Paying an additional fee


Five reasons your license can be suspended or revoked? - 🧠 ANSWER

✔✔1. Knowingly violate provisions


2. Practice fraud or deception in obtaining license.

3. Incompetent to perform services.

4. Permitting use of your license by someone else.

5. Guilty of unprofessional or dishonorable conduct

, No License shall be suspended or revoked by the department unless

_________. - 🧠 ANSWER ✔✔A hearing has been conducted.


Who appoints the members of the Plumbing Code Committee? - 🧠

ANSWER ✔✔The Governor


Plumbing Code Committee shall meet at least how often? - 🧠 ANSWER

✔✔Quarterly


What does ANSI stand for? - 🧠 ANSWER ✔✔American National Standards

Institute


What does ASTM stand for? - 🧠 ANSWER ✔✔American Society for Testing

and Materials

Joints and connections shall be made _____ and _______ tight. - 🧠

ANSWER ✔✔Gas and Water


Caulked joints shall be firmly packed with _______ or _______ and shall

have at least ________ pure lead properly caulked. - 🧠 ANSWER

✔✔Oakum or hemp— 1"


Polyvynil chloride schedule 40 or 80 pipe and fittings shall be ________

_________ joints? - 🧠 ANSWER ✔✔Solvent welded

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