conduit laying/bending duct banks Flashcards
The top of a duct run should be at least ? below the final grade.
2’
On straight pulls, it is rare for the distance between manholes to be greater than ?
500’
Normally, the concrete envelope that surrounds an encased duct is ? thick.
3”
Manufactured spacers for ducts should be placed approximately every ? to provide adequate support for the duct.
5’
The recommended number of ducts in one 3x3 configuration duct run is ? conductors.
9
Without the use of manufactured bends, the maximum directional change of straight PVC conduit should not be greater than ? .
5 degrees
PVC conduit is available in lengths ranging from five feet up to ?
30’
The length of a duct run for modern advanced transmission voltage rated cables is limited to ?
the amount of cable on the reel
When an electric duct system is in a trench shared with vertically stacked telephone or gas utilities, the usual separation is ? between utilities.
6”
If a common trench contains stacked natural gas lines, fiber optic conduits, telephone conduits, and electric cable conduits, the ? lines will be installed at the bottom level.
electric
The length of a duct run is limited by the ?
pull tension required to draw the conductor through the duct.
When drawing cables through conduits, pull speeds of less than ? are recommended for single conductor pulls.
60 feet per minute
Conduit and natural gas lines must not enter the same manhole.
true
Duct banks should avoid going through or across ?
unstable rock
The depth of a conduit bank is determined by the ?
cable voltage
