NCCER Electrical Level 3 Practice Exam 2025 - Free Practice Questions and Study Guide for Electrical Certification

Question: 1 / 400

A 4,000A switchboard requires a minimum distance from the phase bus to the closest steel member of what dimension?

4" (100mm)

6" (150mm)

The requirement for a minimum distance from the phase bus of a 4,000A switchboard to the nearest steel member is based on safety and preventing electrical arcing or short-circuiting. Current-carrying conductors must be adequately spaced from conductive materials to ensure that there is sufficient clearance to protect against any potential electrical faults.

In this case, the minimum distance of 6 inches (150mm) serves as a standard measure established within electrical codes and standards. This ensures that there is a safe separation that can adequately reduce the risk of arcing while maintaining the electrical integrity of the system. Adequate spacing also minimizes electromagnetic interference and allows for proper ventilation, which is crucial for the efficient operation of electrical equipment.

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8" (200mm)

10" (250mm)

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