New York State Master Electrician Practice Exam

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Prepare for the New York State Master Electrician Test with an engaging quiz featuring multiple choice questions and hints for each item. Get the insights you need to ensure you pass your exam with confidence!

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How many #10 conductors can legally be installed in a 4-inch square box that is 2 1/8 deep?

The correct answer is: 12

To determine how many #10 conductors can be legally installed in a 4-inch square box that is 2 1/8 inches deep, one must consider the volume allowance per conductor as specified in the National Electrical Code (NEC). For conductors sized #10 AWG, each conductor requires a specific volume within the box. According to NEC Article 314, a #10 wire occupies 2.0 cubic inches of space. Calculating the total volume of the box is essential. A standard 4-inch square box typically has a volume of 21 cubic inches. However, adjustments must be made for internal equipment such as clamps and devices which will occupy some of this volume. In a standard box, a portion of the volume is allocated for these items. Once you account for these allowances, you can calculate how many #10 conductors can fit: 1. Start with the adjusted volume of the box after deducting for internal components. 2. Divide the usable volume by the volume required per #10 conductor. Once calculations are performed correctly, the maximum number of #10 conductors that can be legally and safely installed in the box is determined to be 12. Therefore, the answer indicating 12 conductors