HOLT Electricians Practice Exam

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What percentage should conductors be sized at of the motor full-load currents?

100%
110%
125%
150%

The correct answer is: 125%

Conductors should be sized at 125% of the motor full-load currents to ensure safe and reliable operation. This percentage takes into account potential inrush currents that occur when a motor starts, which can be significantly higher than the motor's full-load current. By sizing conductors at this increased level, you help to mitigate risks such as overheating and ensure that the wiring can handle the electrical load under normal operating conditions, including the initial surge when the motor powers up. Sizing conductors at 125% provides a buffer that enhances the overall safety of the electrical system, aligning with the standards set forth in the National Electrical Code (NEC). This careful consideration is crucial for maintaining system integrity and preventing electrical failures. The other percentages listed would not adequately consider the demands placed on the conductors, potentially leading to overheating or failure under typical motor operation conditions.