What is the maximum permissible horizontal spacing for supports on 3-inch ABS drainage piping?

Question: What is the maximum permissible horizontal spacing for supports on 3-inch ABS drainage piping?

Answer options:

• 1.0 m (3.3 ft) ✅ 1.2 m (4 ft)
• 1.5 m (5 ft)
• 2.0 m (6.6 ft)

Correct answer: 1.2 m (4 ft)

Explanation: The NPC specifies a maximum horizontal support spacing of 1.2 m (4 ft) for most thermoplastic piping, including ABS and PVC, to prevent sagging over time.