What is the minimum separation for ducts crossing utilities?

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Multiple Choice

What is the minimum separation for ducts crossing utilities?

Keeping space between duct runs when they cross other utilities is about ensuring a safe, workable separation that stays intact through backfill and maintenance. Six inches is the minimum distance that provides reliable clearance so the ducts don’t rub or contact one another or the crossing utility after trench settlement. That gap makes it easier to install any protective sleeves or barriers, reduces the chance of abrasion, and keeps room for future pulls and inspections. Smaller gaps, like a few inches or less, risk contact once backfill settles and during vibration or movement, which can damage duct jackets or cables. Larger gaps aren’t usually required for standard installations and would unnecessarily widen trenches.

Keeping space between duct runs when they cross other utilities is about ensuring a safe, workable separation that stays intact through backfill and maintenance. Six inches is the minimum distance that provides reliable clearance so the ducts don’t rub or contact one another or the crossing utility after trench settlement. That gap makes it easier to install any protective sleeves or barriers, reduces the chance of abrasion, and keeps room for future pulls and inspections.

Smaller gaps, like a few inches or less, risk contact once backfill settles and during vibration or movement, which can damage duct jackets or cables. Larger gaps aren’t usually required for standard installations and would unnecessarily widen trenches.

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