Journeyman Electrician Practice Exam

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Prepare for the Journeyman Electrician Exam. Test your skills with multiple-choice questions designed to help you succeed. Each question comes with hints and detailed explanations to assist in your study process.

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Which of the following is NOT permitted for closing an unused circuit breaker opening in panelboards?

  1. Installation of a closure plate

  2. Installation of a listed spare circuit breaker

  3. Installation of a closure plate or other device fitting securely

  4. Installation of an open circuit breaker

The correct answer is: Installation of an open circuit breaker

The correct answer highlights that installing an open circuit breaker is not permitted for closing an unused circuit breaker opening in panelboards. This is due to safety regulations and standards that require all circuit breakers to be functional and capable of interrupting the circuit they protect. An open circuit breaker does not serve this purpose and could lead to potential hazards, such as exposing the opening to unintended contact or creating a false sense of security about the state of the circuit. In contrast, installing a closure plate or a listed spare circuit breaker is permitted because these options effectively seal off the unused space, preventing any accidental contact or entry into the panelboard. A closure plate securely covers the opening and ensures a clean and safe installation. Meanwhile, a listed spare circuit breaker can be utilized to fill the opening, allowing for easy future expansion if needed, and maintaining compliance with electrical safety codes.

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