New York State Master Electrician Practice Exam 2025 - Free Electrician Practice Questions and Study Guide

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What is the minimum thickness required for a transformer vault floor made with bricks?

4 inches

6 inches

The minimum thickness required for a transformer vault floor made with bricks is established to ensure adequate structural integrity and safety for the equipment it houses. A thickness of 6 inches is generally stipulated because it provides sufficient load-bearing capacity to handle the weight of the transformer and any associated equipment. This thickness also contributes to fire resistance, which is crucial in a transformer vault where hazardous materials may be present and where heat buildup could be a concern.

More substantial thicknesses, such as 8 or 10 inches, would be more than what is typically required for standard applications, potentially adding unnecessary weight and cost without significant benefit. Conversely, a floor thickness of 4 inches may not provide the necessary strength and fire resistance needed for secure operation under the anticipated loads.

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8 inches

10 inches

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