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a. Four electricians are discussing voltage ratings of circuit breakers. Electrician A says that a circuit breaker marked 120/240 V is acceptable for a circuit that doesn't exceed 220 V between any two conductors. Electrician B says that a circuit breaker marked only 240 V wouldn't be acceptable for a circuit exceeding 220 V between any two conductors. Electrician C says that a circuit breaker marked 120/240 V is acceptable for a circuit that exceeds 220 V between any two conductors. Electrician D says the 120/240 V breaker would be acceptable for a circuit that doesn't exceed 240 V between any two conductors. Which electrician is correct? A. Electrician B is correct. B. Electrician C is correct. c. Electrician A is correct.

a. Four electricians are discussing voltage ratings of circuit breakers. Electrician A says that a circuit breaker marked 120/240 V is acceptable for a circuit that doesn't exceed 220 V between any two conductors. Electrician B says that a circuit breaker marked only 240 V wouldn't be acceptable for a circuit exceeding 220 V between any two conductors. Electrician C says that a circuit breaker marked 120/240 V is acceptable for a circuit that exceeds 220 V between any two conductors. Electrician D says the 120/240 V breaker would be acceptable for a circuit that doesn't exceed 240 V between any two conductors. Which electrician is correct? A. Electrician B is correct. B. Electrician C is correct. c. Electrician A is correct.

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17.a. Four electricians are discussing voltage ratings of circuit breakers. Electrician A says that a circuit
breaker marked 120/240 V is acceptable for a circuit that doesn't exceed 220 V between any two
conductors. Electrician B says that a circuit breaker marked only 240 V wouldn't be acceptable for a circuit
exceeding 220 V between any two conductors. Electrician C says that a circuit breaker marked 120/240 V
is acceptable for a circuit that exceeds 220 V between any two conductors. Electrician D says the 120/240
V breaker would be acceptable for a circuit that doesn't exceed 240 V between any two conductors. Which
electrician is correct?
A. Electrician B is correct.
B. Electrician C is correct.
c. Electrician A is correct. 

 

17.a. Four electricians are discussing circuit breakers used as switches. Electrician A says that circuit breakers
used as switches in a 120 V circuit need to be marked SWD. Electrician B says the HID marking isn't
required for high-intensity lighting. Electrician C says that circuit breakers used as switches in a 120 V
circuit need to be marked SWD or HID. Electrician D says that circuit breakers used as switches in a 120
V circuit don't need any marking. Which electrician is correct?
A. Electrician B is correct.
b. Electrician A is correct.
c. Electrician C is correct

the electrician D of the questions is wrong.

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