Nec Electrical Conduit Fill Chart

This online conduit fill calculator is compatible with the us national electrical code nec.

Nec electrical conduit fill chart.

Conduit wire fill charts tables. Nec table 370 16 electrical box fill. Nec table 370 16 a for metal boxes. An electrical distributor supplying everything from light bulbs and dimmers to plcs and industrial automation equipment.

The nec sets standards for the percent of volume that can safely be put into conduit. Welcome to the conduit fill calculator website. Conduit wire fill charts tables. Provides quick and easy results for the conduit fill percent per nec guidelines.

Number of conductors in outlet device and junction boxes. Conduit fill tables nec table c conductor size awg kcmil thhn thwn size 14 12 10 8 6 4 3 2 1 1 0 2 0 3 0 4 0 250 300 350 400 500 600 750 2 emt 241 176 111 64 46 28 24 20 15 12 10 8 7 6 5 4 4 3 2 1 rmc 200 146 92 53 38 23 20 17 12 10 8 7 6 5 4 3 3 2 1 1. Nec table 310 16 allowable ampacities nec appendix c table c1 wires in conduit nec table 370 16 electrical box fill. If you re using electrical metal tubing emt conduit you ll see that the closest size that you need is a 1 in conduit which gives you a 39 fill.

Chapman electric offers a selection of pipe and conduit to meet your electrical or underground project needs. In the past this involved determining the circular mils for various conductors. Information referenced from tables c1 c4 and c8 in the national electric code of 2008. To determine how much wire you can run in a given raceway.

Back to your nec book. Box dimension in inches trade size or type. Find the type of conduit that you want to use in table 4. A conduit fill table guide including trade size and wire size and conductor size.

Find the raceway type and size you re running in table 4 of chapter 9. The below chart is from table 1 in chapter 9 of the national electric code. Fortunately the nec now provides tables to reduce the amount of calculation in the field. Sch 40 and sch 80 pvc conduit combination of table c10 pvc schedule 40 and table c9 pvc schedule 80 based on table 1 chapter 9 of the 2005 national electric code.

Conduit fill calculator conduit fill is the percent of area inside the conduit taken up by the cable s. Hundreds of electrical products and tools to select from. Trade size wire size thwn thhn conductor size awg kcmil 14 12 10 8 6 4 3 2 1 1 0 2 0 3 0 4 0 250 300 350 400 500 600 700 750 1 2 emt 12 9 5 3 2 1 1 1 1 1 imc 14 10 6 3 2 1 1 1 1 1 1 grc.