New York State Master Electrician Practice Exam

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Study for the New York State Master Electrician Exam. Prepare with detailed questions and thorough explanations. Boost your confidence and ace your exam!

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Ground-fault protection of equipment is required from service disconnections rated over 150V to what maximum voltage?

300V
400V
500V
600V

The correct answer is: 600V

Ground-fault protection of equipment is a critical safety requirement in the electrical field, specifically to protect against electrical shock and fire hazards that can arise from ground faults. According to the National Electrical Code (NEC), ground-fault protection is mandated for service disconnections that are rated over 150V, and this requirement extends up to a maximum system voltage of 600V. Choosing a service disconnection rated above 150V up to 600V ensures that any potential ground faults are effectively monitored and interrupted if necessary, thereby protecting both personnel and equipment from the dangerous effects of unintended current paths. Service disconnections exceeding this voltage rating may have differing safety considerations and design requirements, which is why the code explicitly states 600V as the upper limit for the general requirement of ground-fault protection. As voltage levels increase, the complexities and risks associated with electrical equipment also grow, necessitating stringent safety measures. Therefore, ground-fault protection up to 600V is crucial in maintaining safe operating conditions for electrical installations in various environments.