Which of the following criteria do not apply to a 4-inch running trap?

Which of the following criteria do not apply to a 4-inch running trap?

• A. A cleanout on both inlet and outlet side
• B. Grade cleanouts must be poured in a 14 x 20 inch concrete pad
• C. Cleanouts must be accessible
• D. All of the above

Answer: (B)

The correct choice highlights a criterion related to a 4-inch running trap that is not a requirement within the plumbing code. While cleanouts on both the inlet and outlet sides are necessary for maintenance and accessibility purposes, and it is mandated that cleanouts must be accessible to ensure they can be easily reached for clearing blockages, the specific requirement about cleanouts needing to be poured in a 14 x 20 inch concrete pad does not apply universally. This aspect can depend on various installation guidelines and practices that may differ in interpretation or requirement based on location or specific plumbing codes in practice. Thus, only the criterion about the concrete pad does not universally apply, whereas the requirements concerning cleanouts on both sides and their accessibility are standard practices necessary for the effective operation and maintenance of plumbing systems.

The correct choice highlights a criterion related to a 4-inch running trap that is not a requirement within the plumbing code. While cleanouts on both the inlet and outlet sides are necessary for maintenance and accessibility purposes, and it is mandated that cleanouts must be accessible to ensure they can be easily reached for clearing blockages, the specific requirement about cleanouts needing to be poured in a 14 x 20 inch concrete pad does not apply universally. This aspect can depend on various installation guidelines and practices that may differ in interpretation or requirement based on location or specific plumbing codes in practice.

Thus, only the criterion about the concrete pad does not universally apply, whereas the requirements concerning cleanouts on both sides and their accessibility are standard practices necessary for the effective operation and maintenance of plumbing systems.