Underground Conduit & Bends

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Alwayslearningelec

Senior Member
Location
NJ
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Estimator
Have light pole that I'm feeding. As you can see they show the conduit route and it's curved line. I know it's just a depiction but I'm trying to determine if bends/elbows would actually be needed( I know a bend into the base) along the route or straight sticks would get you there. I'm not sure why the route would actually be curved as they show. I do think you could have straight runs pole to pole. Thanks.
 

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If this is softscape or offsite i could care less about the lines. I always look at the landscape and site plans to make sure my pipes will miss trees and such. And other things like lightpole bases or offsite structure footings...
 
rambojoe said:
If this is softscape or offsite i could care less about the lines. I always look at the landscape and site plans to make sure my pipes will miss trees and such. And other things like lightpole bases or offsite structure footings...
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Softscape not hardscape.
 
Using straight runs and 30°, 45° and 90° bends will make wire pulling easier. If you have a gradual curve in the conduit the conductors will create friction against the inside wall of the conduit during the entire pull. Using bends, the friction is at one point in the pull, then the conduit straightens out again.
 
Rick 0920 said:
Using straight runs and 30°, 45° and 90° bends will make wire pulling easier. If you have a gradual curve in the conduit the conductors will create friction against the inside wall of the conduit during the entire pull. Using bends, the friction is at one point in the pull, then the conduit straightens out again.
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I have not found that to be true. My understanding is that theoretically the radius of the band does not affect pulling tension,. However in practice it does because you have to form and then unform the conductors around the bend which takes quite a bit of force for a standard 90. I would take a long sweeping bend over a point bend any day.
 
horsegoer said:
Would you bend or use prefab elbow if having to using horizontal offsets ?
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Is the trench being dug in an arc like in your graphic? If so field bending might be your only option. Years ago we did a job where we threw an A frame bender right in the trench and make small bends to follow the arc of the trench.
 
infinity said:
Is the trench being dug in an arc like in your graphic? If so field bending might be your only option. Years ago we did a job where we threw an A frame bender right in the trench and make small bends to follow the arc of the trench.
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I don’t know…yet
 
That drawing looks nice and purdy. But if I drew that, and I actually expected the electrician to install those nice sweeping curves, I would put a note on the drawing saying so.
 
horsegoer said:
Sorry 2” for the main run then it branches to 1-1/2” to the pole. I know ..still 1-1/2” with 3#6 is crazy
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Amazing and that's "rob roy" or ocal which I've known it to be , that's a pretty intense spec for pole light system. we used that on water treatment facilities which I get but common pole lights, not sure if your project was actually an amusement park or not..
It certainly is safer.



1666329186743.png
 
horsegoer said:
Sorry 2” for the main run then it branches to 1-1/2” to the pole. I know ..still 1-1/2” with 3#6 is crazy
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1-1/2 for 3 number 6 wires! Is the local phone company pulling the wire? They are the only ones around here that need a 4 inch pipe for a one pair fiber line.
 
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