To determine the appropriate American Wire Gauge (AWG) wire size for a 200-amp service in a residential setting, it's crucial to match the wire gauge with the current rating, ensuring safe and efficient electrical conductivity. Let’s review each option provided and the relevant guidelines for aluminum conductor sizing.
1. Consult the National Electrical Code (NEC):
The NEC provides guidelines on the appropriate wire sizes for specific amperage ratings, taking into account safety and efficiency. For a 200-amp service, the NEC recommends specific wire gauges.
2. Understand aluminum vs. copper conductors:
Aluminum conductors generally require a larger size compared to copper conductors for the same current rating due to aluminum's lower conductivity.
3. Examine the options:
a) 12 AWG: This gauge is far too small for a 200-amp service. It is typically used for 20-amp circuits.
b) 14 AWG: This gauge is even smaller than 12 AWG and is used for 15-amp circuits, thus unsuitable for 200 amps.
c) 2/0 AWG: This size can handle up to 200 amps for copper conductors but falls short for aluminum.
d) 4/0 AWG: This is a larger gauge wire suitable for handling 200 amps when using aluminum conductors.
According to the NEC guidelines, a 200-amp service using aluminum conductors necessitates a 4/0 AWG wire size to ensure safety and proper current carrying capacity.
Therefore, the correct answer is:
d) 4/0
