Pulling Calculation - tray cable through underground conduit?

TwoBlocked

Senior Member
Location
Bradford County, PA
Occupation
Industrial Electrician
Haven't done much underground conduit work and am wanting to know just how much pulling force will need to be exerted. The pulling app I usually use just lists wire, not cable. Is there a pulling app you fine folks know of that gives calculations for tray cable in conduit?

The three conduit runs are 200 feet of 2" PVC with 2" rigid 6ft stub ups. There's two 90's in the PVC and another two 90's in the rigid. The pull is expected to be one 3 conductor #8 tray cable and one 16 conductor #16 tray cable. Yeah, going for large radius 90's, even if I gotta make them myself, and ordering a 5,000 gallon tanker of lube. ;)
 
That does not sound like a difficult pull...I would not even try to do a pulling calculation.

As far as the long radius 90s, none of the pulling calculations I have used show that they have any effect on the pulling tension. You only need them when the pulling tension is high to reduce the sidewall pressure on the insulation, as the pressure is a function of the pulling tension and the radius of the bend.
 
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