jghrist;
Very good points. You deserve a star. I do need a little more clarification. In many specifications I have seen that the pull tension and side pressure calculation is not required when the spacing between the manholes is limited to 400 feet when the duct run between the manholes is...
Can any one tell me if there is a industry standard for spacing between manholes connected together with duct banks? Or do we need to calculate the required cable pull tension and side wall pressure for every installation if we do not exceed 4x90=360 degrees of total bend between the manholes...