NEC Commercial Electrical Practice Test

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Prepare for the NEC Commercial Electrical Test with multiple choice questions each with detailed explanations. Study efficiently to excel in your exam!

Practice this question and more.

What is the maximum number of over-current devices that can be installed in a single cutout box for a lighting and appliance branch-circuit panel-board?

The correct answer is: 42

The correct answer is based on the NEC (National Electrical Code) guidelines regarding the installation of over-current devices in a cutout box, particularly for lighting and appliance branch-circuit panel-boards. In accordance with these guidelines, the maximum number of over-current devices that can be installed in a single cutout box is determined to be 42. This limit is laid out within the NEC to ensure safety, prevent overload, and allow for sufficient space for installation and maintenance. Each installation must adhere to this rule to maintain compliance with the code and to minimize potential hazards related to overcrowding within an electrical box, such as overheating or electrical failures. Understanding this limit is crucial for electricians and engineers to ensure safe and efficient electrical system design and installation.