A great tool to help electricians, engineers and contractors answer the question, "What size conduit do I use per the NEC®?"
The app will calculate the conduit fill percentages and jam probability for multiple conductors per NEC® Guidelines. Simply enter the conduit type and size, then specify your conductors.
Jamming is the wedging of three or more cables when pulled into a conduit. This usually occurs because of crossovers when the cables twist or are pulled around bends. The jam ratio is the ratio of the conduit inner diameter and the cable outside diameter. A five percent factor was used to account for the overall cross-section of conduit bends. Jam Probability is only computed where total number of wires is greater or equal to 3.
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