Go to our conduit sizing calculatorto get started. ![]() ![]() You can also edit your conduit fill on the fly, to instantly test various conduit fill scenarios. You’ll see how much faster and easier your calculation becomes. We’ll now learn how to use our conduit sizing calculator using our original example. The fast and easy way how to calculate conduit size for cables and wires This falls short of our total wire cross-section area of 0.8459 in². In addition, a conduit size smaller is 1-1/2″, only allowing for a fill of. This works since our total wire cross-section area is 0.8459 in². We use our total cross-section wire area in the Schedule 40 PVC conduit table.Īccording to the NEC table, a 2-inch conduit can have 1.316 in² of fill while remaining below the 40% requirement. Using NEC Chapter 9 Table 1, we choose the conduit size, which will meet the NEC 40% fill requirement. In our example, we have a total of 9 wires, so we can’t exceed 40% fill in our conduit. Over 2 wires: maximum fill is 40% of the total space inside of a conduit.2 wires: maximum fill is 31% of the total space inside of a conduit.1 wire: maximum fill is 53% of the total space inside of a conduit.NEC Chapter 9 Table 1 tells us the following: We need to find how much space our wires can take up inside of a conduit. Next, we add all the wire cross-section areas together: 0.5565 + 0.1648 + 0.0732 + 0.0243 + 0.0181 = 0.8369 in² STEP #2: Determine the minimum available conduit space We match the insulation type to the wire gauge in the NEC table. Using NEC Chapter 9 Table 5, we calculate the cross-section area of each wire. STEP #1: Calculate the wire cross-section area The sizing will be per the National Electrical Code (NEC). In this example, we’ll size a Schedule 40 PVC conduit for the below-listed wires. HVDC submarine cable cross-section from New Zealand (Photo Credit: Marshelec) The conventional way how to calculate conduit size for cables and wires For example, several insulated wires wrapped in one jacket. Wire: A single conductor, usually made of copper or aluminum.Ĭable: A group of conductors or two or more insulated wires bundled together. We need to understand the differences, as I’ll use both terms throughout this article. These two terms people often confuse together. Our free-to-use conduit sizing calculatorwill do all the hard work for you.īefore we start, it’s important we learn the difference between a wire and a cable. It’s a great way to check tedious hand calculations.Īlso, convenient for calculating conduit sizes on the fly if you’re at a job site or standing in Home Depot. ![]() I’ll show you how to calculate conduit size for cables and wires fast and easily.
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