Florida Electrical Contractor Exam
Practice Questions And Correct Answers
(Verified Answers) Plus Rationales
2025|2026 Q&A | Instant Download Pdf
1. What is the minimum size grounding electrode conductor for a
residential service with a 200-amp main breaker?
#4 AWG copper
The National Electrical Code (NEC) requires a minimum #4 AWG
copper grounding electrode conductor for a 200-amp residential
service to ensure proper grounding and reduce risk of electrical
shock.
2. When installing a 240-volt circuit for a dryer, what is the typical wire
size required for a 30-amp breaker?
#10 AWG copper
A 30-amp dryer circuit requires #10 AWG copper wire to handle the
current without overheating, according to NEC Table 310.15(B)(16).
,3. How many watts can a 20-amp, 120-volt circuit safely supply?
2400 watts
Power (watts) = Voltage × Current. Therefore, 120 V × 20 A = 2400 W.
This is the maximum continuous load recommended for safety.
4. What is the maximum height for a ceiling-mounted outlet in a garage
according to NEC?
6 feet
Outlets must be installed so that they are accessible and avoid
conflicts with typical garage storage; NEC guidance specifies 6 feet
maximum.
5. How many 15-amp branch circuits are required for a kitchen with four
countertop spaces?
Two 20-amp circuits
NEC requires two 20-amp small-appliance branch circuits for kitchen
countertops to prevent overloads. 15-amp circuits are insufficient.
6. What is the minimum burial depth for a 120-volt, 20-amp PVC conduit
underground?
18 inches
NEC 300.5 specifies that PVC conduit for circuits 120 V or less must be
buried at least 18 inches to prevent mechanical damage.
7. When can a flexible cord be used as a substitute for permanent
wiring?
Only for temporary installations or listed appliances
, Flexible cords are not allowed as permanent wiring according to NEC
400.8, except for portable appliances or temporary use.
8. What is the maximum number of conductors allowed in a 4-inch
square box for 14 AWG wire?
8 conductors
Box fill calculations consider each conductor, device, and ground;
NEC Table 314.16(B) allows 8 conductors of 14 AWG in a 4-inch
square box.
9. What type of conduit is suitable for outdoor direct burial applications?
Schedule 40 PVC
Schedule 40 PVC is durable, corrosion-resistant, and allowed for
direct burial per NEC 300.5.
10. What is the NEC minimum service size for a single-family
dwelling?
100 amps
The NEC requires a minimum of 100 amps for new single-family
homes to safely supply typical modern electrical loads.
11. How should aluminum branch-circuit wiring connections be
made to reduce the risk of oxidation?
Use anti-oxidant compound and aluminum-rated terminals
Aluminum forms an oxide layer that increases resistance. Using anti-
oxidant compounds and proper connectors prevents overheating and
fire hazards.
, 12. What is the proper way to install a GFCI receptacle in a wet
location?
Install in accordance with NEC 210.8 and ensure the line/load
orientation is correct
GFCI devices must protect the circuit and be installed so that the line
and load terminals are correctly wired to trip during ground faults.
13. How far apart must receptacles be installed along a kitchen
countertop?
No more than 4 feet apart
NEC 210.52 requires countertop receptacles every 4 feet to ensure
appliances can reach outlets safely.
14. What is the maximum voltage drop recommended for branch
circuits in a residential dwelling?
3%
Voltage drop should not exceed 3% for branch circuits to maintain
efficient operation of appliances and prevent overheating.
15. What is the minimum clearance required around electrical
panels?
36 inches wide and 30 inches deep
NEC 110.26 requires a clear working space to allow safe access for
operation and maintenance.
16. When installing a transformer, what is the required grounding
procedure?
Practice Questions And Correct Answers
(Verified Answers) Plus Rationales
2025|2026 Q&A | Instant Download Pdf
1. What is the minimum size grounding electrode conductor for a
residential service with a 200-amp main breaker?
#4 AWG copper
The National Electrical Code (NEC) requires a minimum #4 AWG
copper grounding electrode conductor for a 200-amp residential
service to ensure proper grounding and reduce risk of electrical
shock.
2. When installing a 240-volt circuit for a dryer, what is the typical wire
size required for a 30-amp breaker?
#10 AWG copper
A 30-amp dryer circuit requires #10 AWG copper wire to handle the
current without overheating, according to NEC Table 310.15(B)(16).
,3. How many watts can a 20-amp, 120-volt circuit safely supply?
2400 watts
Power (watts) = Voltage × Current. Therefore, 120 V × 20 A = 2400 W.
This is the maximum continuous load recommended for safety.
4. What is the maximum height for a ceiling-mounted outlet in a garage
according to NEC?
6 feet
Outlets must be installed so that they are accessible and avoid
conflicts with typical garage storage; NEC guidance specifies 6 feet
maximum.
5. How many 15-amp branch circuits are required for a kitchen with four
countertop spaces?
Two 20-amp circuits
NEC requires two 20-amp small-appliance branch circuits for kitchen
countertops to prevent overloads. 15-amp circuits are insufficient.
6. What is the minimum burial depth for a 120-volt, 20-amp PVC conduit
underground?
18 inches
NEC 300.5 specifies that PVC conduit for circuits 120 V or less must be
buried at least 18 inches to prevent mechanical damage.
7. When can a flexible cord be used as a substitute for permanent
wiring?
Only for temporary installations or listed appliances
, Flexible cords are not allowed as permanent wiring according to NEC
400.8, except for portable appliances or temporary use.
8. What is the maximum number of conductors allowed in a 4-inch
square box for 14 AWG wire?
8 conductors
Box fill calculations consider each conductor, device, and ground;
NEC Table 314.16(B) allows 8 conductors of 14 AWG in a 4-inch
square box.
9. What type of conduit is suitable for outdoor direct burial applications?
Schedule 40 PVC
Schedule 40 PVC is durable, corrosion-resistant, and allowed for
direct burial per NEC 300.5.
10. What is the NEC minimum service size for a single-family
dwelling?
100 amps
The NEC requires a minimum of 100 amps for new single-family
homes to safely supply typical modern electrical loads.
11. How should aluminum branch-circuit wiring connections be
made to reduce the risk of oxidation?
Use anti-oxidant compound and aluminum-rated terminals
Aluminum forms an oxide layer that increases resistance. Using anti-
oxidant compounds and proper connectors prevents overheating and
fire hazards.
, 12. What is the proper way to install a GFCI receptacle in a wet
location?
Install in accordance with NEC 210.8 and ensure the line/load
orientation is correct
GFCI devices must protect the circuit and be installed so that the line
and load terminals are correctly wired to trip during ground faults.
13. How far apart must receptacles be installed along a kitchen
countertop?
No more than 4 feet apart
NEC 210.52 requires countertop receptacles every 4 feet to ensure
appliances can reach outlets safely.
14. What is the maximum voltage drop recommended for branch
circuits in a residential dwelling?
3%
Voltage drop should not exceed 3% for branch circuits to maintain
efficient operation of appliances and prevent overheating.
15. What is the minimum clearance required around electrical
panels?
36 inches wide and 30 inches deep
NEC 110.26 requires a clear working space to allow safe access for
operation and maintenance.
16. When installing a transformer, what is the required grounding
procedure?
