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?
The correct answer is C: AWG number 12. According to the National Electrical Code, the minimum wire size that may be used safely for wiring with a 20-ampere circuit breaker is AWG number 12. AWG 12 wire is rated for 20 amperes. For amateur radio operators, this is essential electrical safety. Understanding this helps ensure safe electrical installation.
Exam Tip
20A circuit breaker = minimum AWG 12 wire. Think '2'0A = '1'2 AWG. AWG 12 wire is rated for 20 amperes according to National Electrical Code. Not AWG 20, not AWG 16, not AWG 8 - just AWG 12.
Memory Aid
"20A circuit breaker = minimum AWG 12 wire. Think '2'0A = '1'2 AWG. AWG 12 wire is rated for 20 amperes according to National Electrical Code. Essential electrical safety requirement."
Real-World Application
A 20-ampere circuit breaker: According to the National Electrical Code, the minimum wire size that may be used safely is AWG number 12. AWG 12 wire is rated for 20 amperes. Using smaller wire (e.g., AWG 14) would be unsafe - it could overheat. AWG 12 is the minimum safe size for 20-ampere circuits.
National Electrical CodeKey Concepts
Why Other Options Are Wrong
Option A (AWG 20): Incorrect. AWG 20 is too small - it's rated for much less than 20 amperes. AWG 20 is too small.
Option B (AWG 16): Incorrect. AWG 16 is too small - it's rated for less than 20 amperes. AWG 16 is too small.
Option D (AWG 8): Incorrect. AWG 8 is larger than needed - AWG 12 is the minimum for 20 amperes. AWG 8 is larger than necessary.
题目解析
The correct answer is C: AWG number 12. According to the National Electrical Code, the minimum wire size that may be used safely for wiring with a 20-ampere circuit breaker is AWG number 12. AWG 12 wire is rated for 20 amperes. For amateur radio operators, this is essential electrical safety. Understanding this helps ensure safe electrical installation.
考试技巧
20A circuit breaker = minimum AWG 12 wire. Think '2'0A = '1'2 AWG. AWG 12 wire is rated for 20 amperes according to National Electrical Code. Not AWG 20, not AWG 16, not AWG 8 - just AWG 12.
记忆口诀
20A circuit breaker = minimum AWG 12 wire. Think '2'0A = '1'2 AWG. AWG 12 wire is rated for 20 amperes according to National Electrical Code. Essential electrical safety requirement.
实际应用示例
A 20-ampere circuit breaker: According to the National Electrical Code, the minimum wire size that may be used safely is AWG number 12. AWG 12 wire is rated for 20 amperes. Using smaller wire (e.g., AWG 14) would be unsafe - it could overheat. AWG 12 is the minimum safe size for 20-ampere circuits.
错误选项分析
Option A (AWG 20): Incorrect. AWG 20 is too small - it's rated for much less than 20 amperes. AWG 20 is too small. Option B (AWG 16): Incorrect. AWG 16 is too small - it's rated for less than 20 amperes. AWG 16 is too small. Option D (AWG 8): Incorrect. AWG 8 is larger than needed - AWG 12 is the minimum for 20 amperes. AWG 8 is larger than necessary.
知识点
National Electrical Code, 20-ampere circuit breaker, AWG number 12, Minimum wire size
Verified Content
Question from official FCC General Class question pool. Explanation reviewed by licensed amateur radio operators.