For a 3/4-inch Schedule 40 PVC conduit, the minimum support distance is ___ feet.

For a 3/4-inch Schedule 40 PVC conduit, the minimum support distance is ___ feet.

• A. 3
• B. 5
• C. 6
• D. 10

Answer: (A)

Rigid nonmetallic conduit (PVC) must be supported at intervals not exceeding 3 feet, and within 3 feet of every box or fitting. This keeps the conduit from sagging or transferring stress to joints. The size doesn’t change this rule, so the maximum allowable distance between supports is 3 feet. Distances like 5, 6, or 10 feet would be too long and not meet the requirement.

Rigid nonmetallic conduit (PVC) must be supported at intervals not exceeding 3 feet, and within 3 feet of every box or fitting. This keeps the conduit from sagging or transferring stress to joints. The size doesn’t change this rule, so the maximum allowable distance between supports is 3 feet. Distances like 5, 6, or 10 feet would be too long and not meet the requirement.