Tom.Margillo
Member
I know that there is a bend radius for cables but has anyone ever heard of a pull radius while pulling cables? 
Wire radius
- Thread starter Tom.Margillo
- Start date
- Status
- Location
- Lockport, IL
- Occupation
- Semi-Retired Electrical Engineer
Re: Wire radius
I have heard of "pulling calculations," in which you determine if an attempt to pull through a conduit would take too much tension, and might therefore damage the cable. I know that the number and degree of bends is part of that calculation. But I have not heard the phrase "pull radius" before.
I have heard of "pulling calculations," in which you determine if an attempt to pull through a conduit would take too much tension, and might therefore damage the cable. I know that the number and degree of bends is part of that calculation. But I have not heard the phrase "pull radius" before.
- Location
- Illinois
- Occupation
- retired electrician
Re: Wire radius
One of the biggest problems in large pulls is the "sidewall pressure" and not the pulling tension. Sidewall pressure is the crushing force applied to the conductor insulation as it is pulled around a bend. The calculation for sidewall pressure for a single cable is found by dividing the tension at that point in the pull by the radius of the bend in feet, so the radius is a big part of the calculation.
Don
One of the biggest problems in large pulls is the "sidewall pressure" and not the pulling tension. Sidewall pressure is the crushing force applied to the conductor insulation as it is pulled around a bend. The calculation for sidewall pressure for a single cable is found by dividing the tension at that point in the pull by the radius of the bend in feet, so the radius is a big part of the calculation.
Don
ron
Senior Member
- Location
- New York, 40.7514,-73.9925
Re: Wire radius
Not only damage the conductor insulation, but damage the raceway too
[ December 16, 2005, 03:22 PM: Message edited by: ron ]
Not only damage the conductor insulation, but damage the raceway too
[ December 16, 2005, 03:22 PM: Message edited by: ron ]
mdshunk
Senior Member
- Location
- Right here.
Re: Wire radius
oops.
Um... yeah. I might have sawed through the inside edge of a few PVC ells before.Originally posted by ron:
Not only damage the conductor insulation, but damage the raceway too
oops.
Re: Wire radius
How do you do the pulling calculations?
What would the formula be.
Is there a web site or book that would help.
I am sure that this can de done in Excel and you would only have to input the parameters.
I've done many large pulls and the only calculations we ever did was just to look at it and bring a bigger puller and rope if it was long or tight.
How do you do the pulling calculations?
What would the formula be.
Is there a web site or book that would help.
I am sure that this can de done in Excel and you would only have to input the parameters.
I've done many large pulls and the only calculations we ever did was just to look at it and bring a bigger puller and rope if it was long or tight.
- Location
- Massachusetts
Re: Wire radius
Raceway Pulling Tension Calculator
Along with being a calculator there is a lot of useful info.
Naw that never happens.
Raceway Pulling Tension Calculator
Along with being a calculator there is a lot of useful info.
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