Journeyman Electrician Practice Exam

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What is the required minimum size of EMT for an installation containing three 2 AWG, four 6 AWG, and three 10 AWG conductors?

  1. 1 inch

  2. 1 1/4 inch

  3. 1 1/2 inch

  4. 2 inch

The correct answer is: 1 1/2 inch

To determine the minimum size of Electrical Metallic Tubing (EMT) required for the installation, we need to calculate the total cross-sectional area of the conductors and then select the size of EMT that can accommodate that area while adhering to the National Electrical Code (NEC) requirements. For the given conductors: - Three 2 AWG conductors, which have a diameter of approximately 0.2576 inches. - Four 6 AWG conductors with a diameter of approximately 0.162 inches. - Three 10 AWG conductors with a diameter of approximately 0.1019 inches. Calculating the total area for each conductor size involves determining the area based on the formula for the area of a circle (A = π(d²/4)), using the diameter for each gauge. Then, add the total area of all conductors together. After calculating the total area, we refer to the NEC table for the allowable fill capacities for EMT. The code specifies that EMT should not be filled to more than 40% of its cross-sectional area when containing conductors. For the calculated total cross-sectional area from the conductors, the required minimum EMT sizes generally fall into certain categories. In this case, the

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