Question
According to the National Electrical Code, what is the minimum wire size that may be used safely for wiring with a 20-ampere circuit breaker?
Answer Options
- A) AWG number 20
- B) AWG number 16
- C) AWG number 12
- D) AWG number 8
Correct Answer: C
Explanation
The National Electrical Code (NEC) Article 310 specifies the minimum wire size for a given circuit breaker or fuse amperage to prevent the wire from overheating and causing a fire. This is a critical electrical safety standard.
For a circuit protected by a 20-ampere circuit breaker, the NEC requires a minimum wire size of AWG number 12. A smaller wire size is permissible only for lower current; for example, AWG number 14 is only permitted for a 15-ampere circuit. Using a smaller wire on a higher-rated breaker is a major fire hazard.
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