MAINE LIMITED ELECTRICIAN – REFRIGERATION
QUESTIONS FORM A REAL EXAM LATEST 2026-2027
UPDATE WITH 100 QUESTIONS & 100% CORRECT
DETAILED ANSWERS GRADED A+ (BRAND NEW!!)
1. What is the primary purpose of equipment grounding in a refrigeration
system?
A. Improve system efficiency
B. Provide a return path for control voltage
C. Prevent overheating of motors
D. Protect against electrical shock by clearing ground faults
Grounding provides a low-impedance path to trip overcurrent devices
during faults.
2. Which NEC article primarily governs electrical installations for refrigeration
equipment?
A. Article 110
B. Article 300
C. Article 440
D. Article 430
Article 440 specifically covers air-conditioning and refrigeration equipment.
3. The minimum ampacity of conductors supplying a hermetic compressor
motor is based on:
A. Rated horsepower
B. Branch circuit breaker size
C. Rated-load current marked on the equipment
, D. Locked-rotor current
NEC 440 requires using the marked rated-load current.
4. What device protects the compressor motor from overheating due to
overload?
A. Circuit breaker
B. Ground-fault interrupter
C. Motor overload protector
D. Time-delay fuse
Overload protection prevents excessive motor temperature rise.
5. What type of fuse is commonly used for refrigeration compressors?
A. Fast-acting fuse
B. Renewable fuse
C. Time-delay fuse
D. Cartridge-only fuse
Time-delay fuses allow high inrush current during startup.
6. Which conductor is permitted to be reidentified by marking in a 120/240V
system?
A. Equipment grounding conductor
B. Neutral conductor
C. White conductor used as an ungrounded conductor
D. Bare conductor
White conductors may be reidentified when used as hot conductors.
7. What is the primary function of a contactor in a refrigeration circuit?
A. Measure voltage
B. Protect against overload
, C. Control power to the compressor motor
D. Regulate refrigerant pressure
Contactors electrically switch motor power on and off.
8. What is the minimum working clearance required in front of electrical
equipment rated 120–250V?
A. 24 inches
B. 36 inches
C. 42 inches
D. 48 inches
NEC requires 36 inches of clear working space.
9. Which color is typically used for equipment grounding conductors?
A. White
B. Red
C. Blue
D. Green or bare
Green or bare conductors identify grounding conductors.
10.What happens when a low-pressure control opens?
A. System increases cooling
B. Compressor speeds up
C. Compressor shuts down to prevent damage
D. Condenser fan stops only
Low-pressure controls protect against loss of refrigerant or airflow.
11.A disconnecting means for refrigeration equipment must be:
A. Lockable only
B. Fuse-protected only
QUESTIONS FORM A REAL EXAM LATEST 2026-2027
UPDATE WITH 100 QUESTIONS & 100% CORRECT
DETAILED ANSWERS GRADED A+ (BRAND NEW!!)
1. What is the primary purpose of equipment grounding in a refrigeration
system?
A. Improve system efficiency
B. Provide a return path for control voltage
C. Prevent overheating of motors
D. Protect against electrical shock by clearing ground faults
Grounding provides a low-impedance path to trip overcurrent devices
during faults.
2. Which NEC article primarily governs electrical installations for refrigeration
equipment?
A. Article 110
B. Article 300
C. Article 440
D. Article 430
Article 440 specifically covers air-conditioning and refrigeration equipment.
3. The minimum ampacity of conductors supplying a hermetic compressor
motor is based on:
A. Rated horsepower
B. Branch circuit breaker size
C. Rated-load current marked on the equipment
, D. Locked-rotor current
NEC 440 requires using the marked rated-load current.
4. What device protects the compressor motor from overheating due to
overload?
A. Circuit breaker
B. Ground-fault interrupter
C. Motor overload protector
D. Time-delay fuse
Overload protection prevents excessive motor temperature rise.
5. What type of fuse is commonly used for refrigeration compressors?
A. Fast-acting fuse
B. Renewable fuse
C. Time-delay fuse
D. Cartridge-only fuse
Time-delay fuses allow high inrush current during startup.
6. Which conductor is permitted to be reidentified by marking in a 120/240V
system?
A. Equipment grounding conductor
B. Neutral conductor
C. White conductor used as an ungrounded conductor
D. Bare conductor
White conductors may be reidentified when used as hot conductors.
7. What is the primary function of a contactor in a refrigeration circuit?
A. Measure voltage
B. Protect against overload
, C. Control power to the compressor motor
D. Regulate refrigerant pressure
Contactors electrically switch motor power on and off.
8. What is the minimum working clearance required in front of electrical
equipment rated 120–250V?
A. 24 inches
B. 36 inches
C. 42 inches
D. 48 inches
NEC requires 36 inches of clear working space.
9. Which color is typically used for equipment grounding conductors?
A. White
B. Red
C. Blue
D. Green or bare
Green or bare conductors identify grounding conductors.
10.What happens when a low-pressure control opens?
A. System increases cooling
B. Compressor speeds up
C. Compressor shuts down to prevent damage
D. Condenser fan stops only
Low-pressure controls protect against loss of refrigerant or airflow.
11.A disconnecting means for refrigeration equipment must be:
A. Lockable only
B. Fuse-protected only
