HOLT Electricians Practice Exam

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What is the minimum size for metal boxes that should be constructed for strength and rigidity?

  1. 50 cubic inches

  2. 100 cubic inches

  3. 150 cubic inches

  4. 200 cubic inches

The correct answer is: 100 cubic inches

The minimum size for metal boxes required for strength and rigidity is 100 cubic inches. This specification comes from the National Electrical Code (NEC), which sets guidelines to ensure that electrical boxes can withstand the stresses they may encounter during installation and over time. While larger sizes exist, 100 cubic inches is the established minimum that ensures sufficient volume for accommodating the wiring and devices, while maintaining structural integrity. Smaller boxes may not meet these strength requirements and could lead to issues such as physical damage or compromised wiring integrity if they cannot withstand environmental factors or installation stresses. Using a smaller size could also limit working space within the box, making it difficult to perform safe electrical installations. Thus, adhering to the 100 cubic inch minimum ensures both compliance with safety standards and practical installation considerations.

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