Conduit Fill Calculation PDF

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Due to the nature of the images, some descriptions will be a bit verbose. ### Image 1 The image could not ne displayed. ### Image 2 The image could not ne displayed. ### Image 3 The image could not ne displayed. ### Image 4 The image displays a series of four green circles illustrating pipe dimensions with labels indicating which dimension the arrow refers to. **NOMINAL PIPE SIZE**. * NPS label, an arrow points to the approximate inner diameter. **OUTSIDE DIAMETER**. * OD label an arrow points to the outer diameter. **INNER DIAMETER**. * ID label, an arrow points to the approximate inside diameter. **WALL THICKNESS.** * WT label, an arrow points to the walls thickness. ### Image 5 The image could not ne displayed. ### Image 6 The image could not ne displayed. ### Image 7 The image could not ne displayed. ### Image 8 The image could not ne displayed. ### Image 9 The image could not ne displayed. ### Image 10 The image could not ne displayed. ### Image 11 The image could not ne displayed. ### Image 12 The image could not ne displayed. ### Image 13 The image could not ne displayed. ### Image 14 The image could not ne displayed. ### Image 15 The image could not ne displayed. ### Image 16 The image could not ne displayed. ### Image 17 The image could not ne displayed. ### Image 18 The image could not ne displayed. ### Image 19 The image could not ne displayed. ### Image 20 The image could not ne displayed. ### Image 21 The image could not ne displayed. ### Image 22 The image could not ne displayed. ### Image 23 The image could not ne displayed. ### Image 24 The image could not ne displayed. ### Image 25 The image could not ne displayed. ### Image 26 The image could not ne displayed. ### Image 27 The image could not ne displayed. ### Image 28 The image could not ne displayed. ### Image 29 The image could not ne displayed. ### Image 30 The image could not ne displayed. ### Image 31 The image could not ne displayed. ### Image 32 The image could not ne displayed. ### Image 33 The image could not ne displayed. ### Image 34 The image could not ne displayed. ### Image 35 **Schedule 80 vs Schedule 40 PVC** | Feature | Schedule 40 PVC Pipe | Schedule 80 PVC Pipe | | ---------------- | -------------------- | -------------------- | | Wall Thickness | Thinner | Thicker | | Pressure Rating | Lower | Higher | | Durability | Less durable | More durable | | Cost | Less expensive | More expensive | ### Image 36 The image could not ne displayed. ### Image 37 The image could not ne displayed. ### Image 38 The image could not ne displayed. ### Image 39 The image could not ne displayed. ### Image 40 **Step 1: Find the Wire Cross-Sectional Area (Table 5)** **ΤΗΗΝ/THWN Wire Cross-Sectional Areas** | Wire Size (AWG/kcmil) | Area per Wire (in²) | | ----------------------- | -------------------- | | 14 AWG | 0.0118 in² | | 12 AWG | 0.0133 in² | | 10 AWG | 0.0211 in² | | 8 AWG | 0.0366 in² | | 6 AWG | 0.0507 in² | | 4 AWG | 0.0824 in² | | 2 AWG | 0.1158 in² | | 1 AWG | 0.1437 in² | | 1/0 AWG | 0.1723 in² | ### Image 41 **Step 2: Find the Conduit's Fill Capacity (Table 4)** **EMT Conduit Fill Capacities** | Conduit Size (inches) | Total Area (in²) | 53% (1 wire) | 31% (2 wires) | 40% (3+ wires) | | ---------------------- | ----------------- | ------------- | ------------- | -------------- | | 1/2" EMT | 0.122 in² | 0.0647 in² | 0.0378 in² | 0.0488 in² | | 3/4" EMT | 0.213 in² | 0.1129 in² | 0.0660 in² | 0.0852 in² | | 1" EMT | 0.346 in² | 0.1834 in² | 0.1073 in² | 0.1384 in² | | 1 1/4" EMT | 0.598 in² | 0.3170 in² | 0.1854 in² | 0.2392 in² | | 11/½" EMT | 0.814 in² | 0.4314 in² | 0.2523 in² | 0.3256 in² | | 2" EMT | 1.342 in² | 0.7113 in² | 0.4160 in² | 0.5368 in² | **How to Use This Table:** * For 1 conductor: The fill cannot exceed 53% of the conduit's total area. * For 2 conductors: The fill cannot exceed 31%. * For 3 or more conductors: The fill cannot exceed 40%. ### Image 42 **Step 3: Perform Conduit Fill Calculation** Let's say we need to fit six (6) THHN 12 AWG wires into an EMT conduit. 1. Find the wire area from Table 5 * 12 AWG THHN = 0.0133 in² per wire 2. Multiply by the number of conductors * Total Wire Area = 6 x 0.0133 = 0.0798 $\text{in}^2$ 3. Find a conduit size in Table 4 that allows at least 0.0798 $\text{in}^2$ at 40% fill: * 1/2" EMT (40% fill = 0.0488 $\text{in}^2$) - Too small ❌ * 3/4" EMT (40% fill = 0.0852 $\text{in}^2$) - Fits ✅ * 1" EMT (40% fill = 0.1384 $\text{in}^2$) - More than enough ✅ Final Answer: Use 3/4" EMT conduit for six 12 AWG THHN wires. ### Image 43 **Summary of the Process** 1. Find the cross-sectional area of one conductor from Table 5. 2. Multiply by the number of conductors to get the total wire area. 3. Look up the conduit's internal area in Table 4 and check the 40% fill capacity. 4. Choose the smallest conduit size that allows all the wires within the fill limit. ### Image 44 **1 ENT (Electrical Nonmetallic Tubing) Fill Capacities** ENT is a flexible, lightweight, nonmetallic conduit used in residential and commercial applications. | Conduit Size (inches) | Total Area (in²) | 53% Fill (1 Wire) | 31% Fill (2 Wires) | 40% Fill (3+ Wires) | | ---------------------- | ----------------- | ----------------- | ----------------- | ------------------- | | 1/2" ENT | 0.122 in² | 0.0647 in² | 0.0378 in² | 0.0488 in² | | 3/4" ENT | 0.213 in² | 0.1129 in² | 0.0660 in² | 0.0852 in² | | 1" ENT | 0.346 in² | 0.1834 in² | 0.1073 in² | 0.1384 in² | | 1 1/4" ENT | 0.598 in² | 0.3170 in² | 0.1854 in² | 0.2392 in² | | 11/½" ENT | 0.814 in² | 0.4314 in² | 0.2523 in² | 0.3256 in² | | 2" ENT | 1.342 in² | 0.7113 in² | 0.4160 in² | 0.5368 in² | ### Image 45 **2 IMC (Intermediate Metal Conduit) Fill Capacities** IMC is a lighter and thinner version of RMC but still provides strong mechanical protection. | Conduit Size (inches) | Total Area (in²) | 53% Fill (1 Wire) | 31% Fill (2 Wires) | 40% Fill (3+ Wires) | | ---------------------- | ----------------- | ----------------- | ----------------- | ------------------- | | 1/2" IMC | 0.175 in² | 0.0928 in² | 0.0543 in² | 0.0700 in² | | 3/4" IMC | 0.302 in² | 0.1601 in² | 0.0936 in² | 0.1208 in² | | 1" IMC | 0.491 in² | 0.2602 in² | 0.1522 in² | 0.1964 in² | | 1 1/4" IMC | 0.814 in² | 0.4314 in² | 0.2523 in² | 0.3256 in² | | 11/½" IMC | 1.066 in² | 0.5650 in² | 0.3305 in² | 0.4264 in² | | 2" IMC | 1.728 in² | 0.9160 in² | 0.5357 in² | 0.6912 in² | | 2 1/2" IMC | 2.626 in² | 1.3918 in² | 0.8138 in² | 1.0504 in² | | 3" IMC | 3.872 in² | 2.0522 in² | 1.2003 in² | 1.5488 in² | | 3 1/2" IMC | 5.334 in² | 2.8270 in² | 1.6535 in² | 2.1336 in² | | 4" IMC | 7.065 in² | 3.7445 in² | 2.1902 in² | 2.8260 in² | ### Image 46 **3 RMC (Rigid Metal Conduit) Fill Capacities** RMC is the heaviest and thickest metal conduit, offering the most protection for conductors. | Conduit Size (inches) | Total Area (in²) | 53% Fill (1 Wire) | 31% Fill (2 Wires) | 40% Fill (3+ Wires) | | ---------------------- | ----------------- | ----------------- | ----------------- | ------------------- | | 1/2" RMC | 0.213 in² | 0.1129 in² | 0.0660 in² | 0.0852 in² | | 3/4" RMC | 0.387 in² | 0.2059 in² | 0.1200 in² | 0.1548 in² | | 1" RMC | 0.621 in² | 0.3291 in² | 0.1925 in² | 0.2484 in² | | 1 1/4" RMC | 0.976 in² | 0.5173 in² | 0.3026 in² | 0.3904 in² | | 11/2" RMC | 1.360 in² | 0.7208 in² | 0.4216 in² | 0.5440 in² | | 2" RMC | 2.296 in² | 1.2169 in² | 0.7118 in² | 0.9184 in² | | 2 1/2" RMC | 3.565 in² | 1.8895 in² | 1.1052 in² | 1.4260 in² | | 3" RMC | 5.042 in² | 2.6723 in² | 1.5630 in² | 2.0168 in² | | 3 1/2" RMC | 6.581 in² | 3.4899 in² | 2.0381 in² | 2.6324 in² | | 4" RMC | 8.554 in² | 4.5336 in² | 2.6517 in² | 3.4216 in² | ### Image 47 **Conduit Fill Capacity for RNC (Rigid Nonmetallic Conduit) – NEC Chapter 9, Table 4** RNC (Rigid Nonmetallic Conduit, PVC) is commonly used for underground and wet locations. **NEC Table 4: Conduit Fill Capacities for RNC (PVC)** This table provides the total cross-sectional area of RNC conduits and the maximum allowable fill for different numbers of wires. | Conduit Size (inches) | Total Area (in²) | 53% Fill (1 Wire) | 31% Fill (2 Wires) | 40% Fill (3+ Wires) | | ---------------------- | ----------------- | ----------------- | ----------------- | ------------------- | | 1/2" RNC | 0.211 in² | 0.1118 in² | 0.0654 in² | 0.0844 in² | | 3/4" RNC | 0.352 in² | 0.1866 in² | 0.1091 in² | 0.1408 in² | | 1" RNC | 0.554 in² | 0.2936 in² | 0.1712 in² | 0.2216 in² | | 1 1/4" RNC | 0.976 in² | 0.5173 in² | 0.3026 in² | 0.3904 in² | | 1 1/2" RNC | 1.360 in² | 0.7208 in² | 0.4216 in² | 0.5440 in² | | 2" RNC | 2.296 in² | 1.2169 in² | 0.7118 in² | 0.9184 in² | | 2 1/2" RNC | 3.451 in² | 1.8290 in² | 1.0708 in² | 1.3804 in² | | 3" RNC | 5.007 in² | 2.6537 in² | 1.5522 in² | 2.0028 in² | | 3 1/2" RNC | 6.610 in² | 3.5033 in² | 2.0491 in² | 2.6440 in² | | 4" RNC | 8.737 in² | 4.6306 in² | 2.7085 in² | 3.4948 in² | ### Image 48 The image could not ne displayed. 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