NEC 2014: Chapter 9 Table 4Dimensions and Percent Area of Conduit and Tubing (SeeChapter 9 Table 1 for allowed use of conduit area)Article 358 - Electrical Metallic Tubing (EMT)Metric DesignatorTrade SizeNominal Internal DiameterTotal Area 100%60%1 Wire53%2 Wires31%Over 2 Wires40%mmin.mm ²in. ²161⁄29.1810.013⁄44.30.2132715.517.346351 1⁄4.890.598411 1⁄21.220.814532162.013711.032 1⁄2783.515172.343783705.307763.538913 1⁄2476.119981717.8198085.901Article 362 - Electrical Nonmetallic Tubing (ENT)Metric DesignatorTrade SizeNominal Internal DiameterTotal Area 100%60%1 Wire53%2 Wires31%Over 2 Wires40%mmin.mm ²in. ²161⁄28.170.013⁄42.300.2032713.496.333351 1⁄4.879.581411 1⁄28.199.7945121.9755.316632 1⁄2————————————783————————————913 1⁄2————————————Article 348 - Flexible Metal Conduit (FMC)Metric DesignatorTrade SizeNominal Internal DiameterTotal Area 100%60%1 Wire53%2 Wires31%Over 2 Wires40%mmin.mm ²in. ²123⁄40.190.000.046161⁄20.130.013⁄44.30.213271.46.327351 1⁄42.765.511411 1⁄220.117.74353201.9615.307632 1⁄22.94581.96364.241412.827913 1⁄25.773923.64886.662435.027Article 324 - Intermediate Metal Conduit (IMC)Metric DesignatorTrade SizeNominal Internal DiameterTotal Area 100%60%1 Wire53%2 Wires31%Over 2 Wires40%mmin.mm ²in.
Pvc Conduit Conductor Fill Chart
²123⁄8————————————161⁄2.2090.113⁄47.351.2352712.579.384351 1⁄406.98300.511 1⁄243.33440.624.1782.452632 1⁄2303.081022.054783114.753583.169913 1⁄2095.61721237.2244905.452Article 356 - Liquidtight Flexible Nonmetalic Conduit (LFNC-B)Metric DesignatorTrade SizeNominal Internal DiameterTotal Area 100%60%1 Wire53%2 Wires31%Over 2 Wires40%mmin.mm ²in. ²123⁄8230.150.190.077161⁄20.1830.013⁄4.320.2162716.52750.251 1⁄48.91.611411 1⁄227.18.792532091.948.298Article 356 - Liquidtight Flexible Nonmetalic Conduit (LFNC-A)Metric DesignatorTrade SizeNominal Internal DiameterTotal Area 100%60%1 Wire53%2 Wires31%Over 2 Wires40%mmin.mm ²in. ²123⁄8250.160.10.0.62.100.1.820.2836.859.26511⁄46.900.6014111⁄230.21.807532152.0066.337Article 350 - Liquidtight Flexible Metal Conduit (LFMC)Metric DesignatorTrade SizeNominal Internal DiameterTotal Area 100%60%1 Wire53%2 Wires31%Over 2 Wires40%mmin.mm ²in. ²123⁄8230.150.190.077161⁄20.1830.013⁄4.320.2162716.52750.251 1⁄48.91.611411 1⁄227.18.792532091.948.298632 1⁄2142.92971.953783824.485492.99913 1⁄275.839943.2.692333.935295————————————1556————————————Article 344 - Rigid Metal Conduit (RMC)Metric DesignatorTrade SizeNominal Internal DiameterTotal Area 100%60%1 Wire53%2 Wires31%Over 2 Wires40%mmin.mm ²in. ²123⁄8————————————161⁄20.1830.013⁄45.32090.112.88030.4290.355351 1⁄48.910.61411 1⁄233.241.829532192.0458.363632 1⁄2132.91971.94678344.499503913 1⁄261.006004.2.882403.99429513048.129.039752811.663Article 352 - Rigid PVC Conduit (PVC), Schedule 80Metric DesignatorTrade SizeNominal Internal DiameterTotal Area 100%60%1 Wire53%2 Wires31%Over 2 Wires40%mmin.mm ²in.
1 Inch Pvc Conduit Fill Chart
²123⁄8————————————161⁄2410.20.160.087213⁄46.24.1642714.413.275351 1⁄49.744.495411 1⁄210.02420.532851.727.15632 1⁄262.47121.647783153.865282.577913 1⁄2605.213733.4751034365.967011105.5355561110.239Articles 352 and 353 - Rigid PVC Conduit (PVC), Schedule 40,and HDPE Conduit (HDPE)Metric DesignatorTrade SizeNominal Internal DiameterTotal Area 100%60%1 Wire53%2 Wires31%Over 2 Wires40%mmin.mm ²in. ²123⁄8————————————161⁄28.170.013⁄42.300.2032713.496.333351 1⁄4.8700.411 1⁄28.199.7945121.975581.032 1⁄2022.81731.878783694.361452.907913 1⁄2275.842943.7.532505.86.126556181708.856737311.427Article 352 - Type A, Rigid PVC Conduit (PVC)Metric DesignatorTrade SizeNominal Internal DiameterTotal Area 100%60%1 Wire53%2 Wires31%Over 2 Wires40%mmin.mm ²in. ²161⁄20.38320.2000.154213⁄490.6.2019.651.434351 1⁄4.05.707411 1⁄20.39650.732352.1882.459632 1⁄2513.2729.181784.91663.278913 1⁄2966.416134.3.723694.254295————————————1556————————————Article 352 - Type EB, Rigid PVC Conduit (PVC)Metric DesignatorTrade SizeNominal Internal DiameterTotal Area 100%60%1 Wire53%2 Wires31%Over 2 Wires40%mmin.mm ²in. ²161⁄2————————————213⁄4————————————271————————————351 1⁄4————————————411 1⁄2————————————532492.3257.55632 1⁄2————————————78325.2267432.713 1⁄2396.023931587.657721346.8815561003012.612.