1-1/2" EMT Conduit Fill Chart
This page shows the maximum number of conductors allowed in a 1-1/2-inch Electrical Metallic Tubing (EMT) conduit per the National Electrical Code. The 1-1/2" EMT has an internal cross-sectional area of 2.036 square inches, which determines how many wires of each size can legally fit inside. Use the tables below to quickly look up conductor capacity for your installation, or use the calculator for custom configurations.
THHN/THWN-2 Maximum Conductors in 1-1/2" EMT
THHN/THWN-2 is the most commonly used conductor type in commercial and residential wiring. The table below shows the maximum number of THHN/THWN-2 conductors allowed in this 1-1/2" EMT conduit based on NEC Chapter 9 fill rules. For 3 or more conductors the 40% fill rule applies. Values of 0 mean the conductor is too large to fit even a single wire in this conduit size.
| Wire Size | Wire Area (sq.in.) | Max Conductors | Fill at Max (sq.in.) |
|---|---|---|---|
| 14 AWG | 0.0097 | 83 | 0.8051 |
| 12 AWG | 0.0133 | 61 | 0.8113 |
| 10 AWG | 0.0211 | 38 | 0.8018 |
| 8 AWG | 0.0366 | 22 | 0.8052 |
| 6 AWG | 0.0507 | 16 | 0.8112 |
| 4 AWG | 0.0824 | 9 | 0.7416 |
| 3 AWG | 0.0973 | 8 | 0.7784 |
| 2 AWG | 0.1158 | 7 | 0.8106 |
| 1 AWG | 0.1562 | 5 | 0.7810 |
| 1/0 AWG | 0.1855 | 4 | 0.7420 |
| 2/0 AWG | 0.2223 | 3 | 0.6669 |
| 3/0 AWG | 0.2679 | 3 | 0.8037 |
| 4/0 AWG | 0.3237 | 1 | 0.3237 |
| 250 AWG | 0.3970 | 1 | 0.3970 |
| 300 AWG | 0.4608 | 1 | 0.4608 |
| 350 AWG | 0.5242 | 1 | 0.5242 |
| 400 AWG | 0.5863 | 1 | 0.5863 |
| 500 AWG | 0.7073 | 1 | 0.7073 |
About 1-1/2" Electrical Metallic Tubing
EMT is the most commonly used conduit in commercial and residential construction. It is lightweight, easy to bend with a standard conduit bender, and cost-effective for indoor applications. EMT is widely used in exposed wiring systems in commercial buildings, above suspended ceilings, and in dry locations. It is not suitable for direct burial or wet locations unless specifically listed fittings are used. The 1-1/2-inch trade size is one of the standard sizes defined in NEC Chapter 9, Table 4. With an internal area of 2.036 square inches, it provides adequate space for a range of conductor sizes and counts depending on the application requirements.
EMT is made from thin-walled steel or aluminum tubing. It uses compression or set-screw fittings rather than threaded connections, making installation faster. The thin walls mean EMT has a larger internal area than RMC of the same trade size, allowing more conductors.
NEC Reference: NEC Article 358 governs the installation requirements for EMT conduit. Conduit fill is calculated using NEC Chapter 9, Table 1 (fill percentages), Table 4 (conduit areas), and Table 5 (conductor areas). This calculator uses the exact values from these tables for accurate results.
Worked Example: 12 AWG THHN in 1-1/2" EMT
Here is a step-by-step example showing how to calculate conduit fill for 4 conductors of 12 AWG THHN/THWN-2 in this 1-1/2" EMT conduit. This is a common scenario for a 20-amp branch circuit requiring two hots, a neutral, and a ground.
- Identify the conduit internal area: 1-1/2" EMT = 2.036 sq.in. (from NEC Table 4)
- Identify the conductor area: 12 AWG THHN/THWN-2 = 0.0133 sq.in. per conductor (from NEC Table 5)
- Calculate total conductor area: 4 conductors x 0.0133 sq.in. = 0.0532 sq.in.
- Determine the fill percentage rule: 4 conductors uses the 40% fill rule (NEC Table 1)
- Calculate allowable fill area: 2.036 sq.in. x 0.40 = 0.8144 sq.in.
- Compare: Total conductor area (0.0532 sq.in.) is less than allowable fill (0.8144 sq.in.) — COMPLIANT
- Actual fill percentage: 0.0532 / 2.036 = 2.6%
- Maximum conductors: This 1-1/2" EMT can hold up to 61 conductors of 12 AWG THHN/THWN-2 per NEC rules
XHHW Maximum Conductors in 1-1/2" EMT
XHHW conductors use cross-linked polyethylene insulation, which provides excellent moisture and heat resistance. XHHW has slightly different insulation dimensions than THHN, resulting in different fill counts. The table below shows the maximum XHHW conductors allowed in this 1-1/2" EMT conduit.
| Wire Size | Wire Area (sq.in.) | Max Conductors |
|---|---|---|
| 14 AWG | 0.0139 | 58 |
| 12 AWG | 0.0181 | 44 |
| 10 AWG | 0.0243 | 33 |
| 8 AWG | 0.0437 | 18 |
| 6 AWG | 0.0590 | 13 |
| 4 AWG | 0.0814 | 10 |
| 3 AWG | 0.0962 | 8 |
| 2 AWG | 0.1146 | 7 |
| 1 AWG | 0.1534 | 5 |
| 1/0 AWG | 0.1825 | 4 |
| 2/0 AWG | 0.2190 | 3 |
| 3/0 AWG | 0.2642 | 3 |
| 4/0 AWG | 0.3197 | 1 |
| 250 AWG | 0.3904 | 1 |
| 300 AWG | 0.4536 | 1 |
| 350 AWG | 0.5166 | 1 |
| 400 AWG | 0.5782 | 1 |
| 500 AWG | 0.6984 | 1 |
Installation Advantages of EMT
Lowest cost among metal conduit types. Lightest weight for easier handling and support. Largest internal area per trade size among metal conduits. Easy to bend on-site with a hand bender or mechanical bender.
Installation Requirements
EMT is joined using compression or set-screw connectors and couplings. It can be bent up to a total of 360 degrees between pull points. Supports must be placed within 10 feet of each box and at intervals not exceeding 10 feet.
When planning your installation with 1-1/2" EMT conduit, remember that the fill calculation only addresses the straight sections. The number of bends, total conduit length, and pulling tension also affect whether the installation is practical. The NEC limits total bends to 360 degrees (four 90-degree bends) between pull points. For long runs or runs with many bends, consider using the next larger conduit size even if the fill calculation passes, as this will reduce pulling tension and make future maintenance easier.
Other EMT Sizes
Browse fill charts for other Electrical Metallic Tubing trade sizes. Larger conduit sizes accommodate more conductors and are needed for high-ampacity circuits or runs with many wires.