New York State Master Electrician Practice Exam

What is the maximum size of copper grounding conductor that should be used according to current standards?

1. #10

2. #12

3. #14

4. #16

The correct answer is: #14

The maximum size of a copper grounding conductor specified in electrical codes is based on the requirements established to ensure safety and performance. Grounding conductors are critical for protecting against electrical shocks and providing a path for fault current. Copper grounding conductors, according to the National Electrical Code (NEC) and general practices in New York State, are often sized based on the amperage of service or feeder conductors. The NEC typically allows for a minimum size of #8 AWG copper for grounding conductors when the system involves certain conditions, but it's important to consider that in practice, the maximum size can vary based on conductors involved and specific installation scenarios. In many instances, #14, being a smaller size than the commonly accepted minimum and maximum sizes for grounding, would not be suitable as a maximum size. The importance of sizing appropriately ensures that the grounding system can withstand potential fault currents without damage. In the context of typical applications, it would seem that the common answers provided would revolve more around #8 for minimum and potentially larger sizes as maximums, suggesting that the correct size might not be #14. Thus, recognizing the maximum permissible size generally shifts towards ensuring robust safety within the installation, with larger sizes often being encouraged for enhanced performance. To follow