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UPC Section 718 requires building sewers to be installed at a depth of not less than 12 inches below grade. This depth provides frost protection, mechanical protection, and ensures proper slope is maintained. Shallower installations would risk damage and freezing. Correct answer: B. 12 inches.

The UPC requires that all building drains serving a dwelling must be at least 4 inches in diameter. Smaller drains cannot handle combined loads from toilets, sinks, and other fixtures. This rule ensures long-term performance and compliance with sanitary standards. Correct answer: C. 4 inches.

The UPC requires that the discharge from a temperature and pressure relief (T&P) valve terminate not more than 6 inches and not less than 2 times the pipe diameter above the floor or receptor. This ensures hot water or steam can discharge safely without splashing excessively while still allowing for inspection of the termination. Too much distance could create hazards, while less than 2 times the pipe diameter could cause backpressure. Correct answer: A. 6 inches.

The UPC specifies hanger spacing to prevent sagging and ensure slope integrity. For ABS or PVC plastic drainage piping up to 1-1/2 inch, hangers must be placed at 3-foot intervals horizontally. This prevents deflection that can trap solids and water. Larger diameters allow greater spacing, but smaller pipes require closer support. Correct answer: B. 3 feet.

The UPC requires 18 inches of clearance in front of cleanouts for piping larger than 2 inches. This ensures accessibility for maintenance and auger use. Correct answer: C. 18 inches.