1 Reply Latest reply on Dec 12, 2013 8:44 AM by andy_cooper

    Why do some bundles use the user defined C.S.A. multiplication factor?


      When using Actions > Processing > Calculate Node/Bundle Sizes (Ctrl + Alt + B) the following message is displayed.


      Will use user defined CSA message.JPG


      Why are a select few of my bundles using the user defined multiplication factor?

        • 1. Re: Why do some bundles use the user defined C.S.A. multiplication factor?

          Hi Brian,

          The system uses the 'user defined multiplication factor' method of diameter calculation when the result from the 'Navy Table look up' method for bundle dimeter calculation returns a value that is less than the diameter based on the total CSA of the wires with no air gap. i.e. gives a value that is technically impossible.

          The Navy Table look-up method utilses the average wire diameter in a bundle and it has been proven to be very reliable when there are many wires with diameters that are all the same/are very similar, however this can start to become erroneous when  the average is reduced by the presence of significantly different sized wires in a bundle.

          So we detect when the Navy Table cannot provide a valid result and then switch to using the user specified multplication factor as the next best methid instead.

          So I would expect that if you analyzed the content of the bundles you mention that they would have disparate sizes of wires and may also have only a few wires in the bundle.

          Hope this helps,