The minimum conductor size for a ______-amp service is 4-awg copper or 2-awg aluminum.

• A. 400
• B. 100
• C. 200
• D. none of these

Answer: (B)

The correct answer is 200 amp service. For a 200-amp residential service, typical code requirements indicate that the minimum conductor sizes are indeed 4 AWG for copper and 2 AWG for aluminum. These specific sizes ensure that the conductors can safely carry the electrical load without overheating, thus maintaining safety standards in residential wiring.

Understanding conductor sizing is crucial for residential electrical inspections because improper sizing can lead to electrical failures, increased resistance, and potentially hazardous situations such as overheating or fire. The National Electrical Code (NEC) provides guidelines based on the ampacity of the conductor materials, which is why these specific sizes are used for 200-amp services.

In the context of this question, other choices do not align with the standard codes for those respective amperages. For instance, a 400-amp service would require larger conductors, while a 100-amp service would utilize smaller sizes than given. Having this knowledge assists electrical inspectors in confirming that installations comply with safety regulations.