New York City DCAS Electrician Civil Service
Exam Questions And Well Graded Solutions
With Rationales Updated 2026-2027
Pass your 2026 NYC DCAS Electrician Exam (No. 6048) with this comprehensive study guide featuring
300 practice questions. Master critical civil service test topics, including the NYC Electrical Code
amendments, AC/DC machinery, circuits, grounding, blueprint reading, and safety protocols. Each
question includes detailed rationales to ensure you understand core concepts and pass with a
score of 70% or higher to secure a top spot on the municipal hiring list
1. What is the maximum continuous load permitted on a 20-ampere overcurrent
protection device?
A) 12 Amperes
B) 16 Amperes
C) 20 Amperes
D) 24 Amperes
Rationale: Continuous loads must not exceed 80% of the branch-circuit rating (20A x
0.80 = 16A).
2. Which of the following is strictly prohibited for use as a grounding electrode?
A) Underground gas piping systems
B) Driven steel ground rods
C) Concrete-encased reinforcing steel
D) Structural building steel
Rationale: Gas lines carry flammable materials and are legally barred from serving
as grounding electrodes.
3. What is the maximum number of No. 12 AWG THHN conductors permitted in a 1/2-
inch EMT conduit?
A) 6 Conductors
B) 9 Conductors
C) 12 Conductors
D) 15 Conductors
Rationale: Conduit fill tables limit 1/2-inch EMT to 9 No. 12 THHN wires to maintain
the 40% fill capacity.
4. How many degrees of total bends are permitted between pull points in a single run of
conduit?
A) 180 degrees
B) 270 degrees
C) 360 degrees
, D) 450 degrees
Rationale: The code limits total bends to 360 degrees (four 90-degree bends) to
prevent damage to wire insulation during pulling.
5. What is the multiplier used to calculate the minimum length of a pull box for a straight
pull of conduits?
A) 4 times the trade size
B) 8 times the trade size
C) 6 times the trade size
D) 10 times the trade size
Rationale: For straight pulls, the length of the box must be at least 8 times the trade
diameter of the largest raceway.
6. What is the maximum distance allowed between a box and the first structural support
for EMT conduit?
A) 1 foot
B) 3 feet
C) 5 feet
D) 10 feet
Rationale: EMT must be securely fastened within 3 feet of each termination point,
box, or fitting.
7. Which color is reserved exclusively for the grounded circuit conductor (neutral)?
A) Green
B) Black
C) White
D) Red
Rationale: Grounded conductors must be identified by a continuous white or gray
outer finish.
8. What instrument is used to measure high-value electrical insulation resistance?
A) Ammeter
B) Voltmeter
C) Megohmmeter
D) Wattmeter
Rationale: A megohmmeter (or Megger) applies high voltage to test the integrity of
wire insulation.
9. What is the demand factor applied to the first 3,000 volt-amperes of a general
lighting load in a dwelling?
A) 100%
B) 35%
C) 50%
, D) 25%
Rationale: Standard calculations apply a 100% demand factor to the first 3,000 VA of
a residential lighting load.
10. What is the minimum depth required for a standard ground rod driven into the earth?
A) 6 feet
B) 8 feet
C) 10 feet
D) 12 feet
Rationale: Ground rods must have at least 8 feet of length in contact with the soil to
ensure an effective ground.
11. What type of overcurrent condition is caused by a direct connection between a hot
phase and a neutral wire?
A) Overload
B) Short circuit
C) Ground fault
D) Corona discharge
Rationale: A short circuit is an overcurrent path of low resistance connecting two
points of different potential.
12. What size equipment grounding conductor is required for a branch circuit protected
by a 15-ampere device?
A) 14 AWG
B) 12 AWG
C) 10 AWG
D) 8 AWG
Rationale: A 15-ampere overcurrent device requires a minimum 14 AWG copper
equipment grounding conductor.
13. What is the synchronous speed of a 4-pole AC motor operating at a frequency of 60
Hz?
A) 1200 RPM
B) 1800 RPM
C) 3600 RPM
D) 900 RPM
Rationale: Speed = (120 x Frequency) / Poles. Therefore, (120 x 60) / 4 = 1800
RPM.
14. How are ammeters connected relative to the load being measured?
A) In series
B) In parallel
C) In bridge configuration
, D) In bypass shunt
Rationale: Ammeters have low internal resistance and must be connected in series
to measure total circuit current.
15. What is the minimum clear working space depth required in front of live electrical
equipment operating at 120V to ground?
A) 3 feet
B) 4 feet
C) 5 feet
D) 6 feet
Rationale: For voltages to ground up to 150V, the clear working depth must be a
minimum of 3 feet.
16. What device automatically opens a circuit when a current imbalance between hot
and neutral wires exceeds 5 milliamperes?
A) Circuit breaker
B) Thermal overload relay
C) Ground-Fault Circuit-Interrupter
D) Fuse
Rationale: A Class A GFCI device is designed to trip when a ground fault fault
leakage ranges between 4 to 6 mA.
17. What type of enclosure is specifically designed for indoor use to protect workers
against dust and falling dirt?
A) NEMA 1
B) NEMA 3R
C) NEMA 4X
D) NEMA 7
Rationale: NEMA 1 enclosures are intended for general-purpose indoor use to
provide basic protection.
18. What is the total resistance of two 10-ohm resistors connected in a parallel
configuration?
A) 20 Ohms
B) 10 Ohms
C) 5 Ohms
D) 2.5 Ohms
Rationale: For equal parallel resistors, divide the resistance by the quantity of
components ( = 5 ohms).
19. Which formula correctly expresses Ohm’s Law for calculating current?
A) I = V / R
B) I = V x R
Exam Questions And Well Graded Solutions
With Rationales Updated 2026-2027
Pass your 2026 NYC DCAS Electrician Exam (No. 6048) with this comprehensive study guide featuring
300 practice questions. Master critical civil service test topics, including the NYC Electrical Code
amendments, AC/DC machinery, circuits, grounding, blueprint reading, and safety protocols. Each
question includes detailed rationales to ensure you understand core concepts and pass with a
score of 70% or higher to secure a top spot on the municipal hiring list
1. What is the maximum continuous load permitted on a 20-ampere overcurrent
protection device?
A) 12 Amperes
B) 16 Amperes
C) 20 Amperes
D) 24 Amperes
Rationale: Continuous loads must not exceed 80% of the branch-circuit rating (20A x
0.80 = 16A).
2. Which of the following is strictly prohibited for use as a grounding electrode?
A) Underground gas piping systems
B) Driven steel ground rods
C) Concrete-encased reinforcing steel
D) Structural building steel
Rationale: Gas lines carry flammable materials and are legally barred from serving
as grounding electrodes.
3. What is the maximum number of No. 12 AWG THHN conductors permitted in a 1/2-
inch EMT conduit?
A) 6 Conductors
B) 9 Conductors
C) 12 Conductors
D) 15 Conductors
Rationale: Conduit fill tables limit 1/2-inch EMT to 9 No. 12 THHN wires to maintain
the 40% fill capacity.
4. How many degrees of total bends are permitted between pull points in a single run of
conduit?
A) 180 degrees
B) 270 degrees
C) 360 degrees
, D) 450 degrees
Rationale: The code limits total bends to 360 degrees (four 90-degree bends) to
prevent damage to wire insulation during pulling.
5. What is the multiplier used to calculate the minimum length of a pull box for a straight
pull of conduits?
A) 4 times the trade size
B) 8 times the trade size
C) 6 times the trade size
D) 10 times the trade size
Rationale: For straight pulls, the length of the box must be at least 8 times the trade
diameter of the largest raceway.
6. What is the maximum distance allowed between a box and the first structural support
for EMT conduit?
A) 1 foot
B) 3 feet
C) 5 feet
D) 10 feet
Rationale: EMT must be securely fastened within 3 feet of each termination point,
box, or fitting.
7. Which color is reserved exclusively for the grounded circuit conductor (neutral)?
A) Green
B) Black
C) White
D) Red
Rationale: Grounded conductors must be identified by a continuous white or gray
outer finish.
8. What instrument is used to measure high-value electrical insulation resistance?
A) Ammeter
B) Voltmeter
C) Megohmmeter
D) Wattmeter
Rationale: A megohmmeter (or Megger) applies high voltage to test the integrity of
wire insulation.
9. What is the demand factor applied to the first 3,000 volt-amperes of a general
lighting load in a dwelling?
A) 100%
B) 35%
C) 50%
, D) 25%
Rationale: Standard calculations apply a 100% demand factor to the first 3,000 VA of
a residential lighting load.
10. What is the minimum depth required for a standard ground rod driven into the earth?
A) 6 feet
B) 8 feet
C) 10 feet
D) 12 feet
Rationale: Ground rods must have at least 8 feet of length in contact with the soil to
ensure an effective ground.
11. What type of overcurrent condition is caused by a direct connection between a hot
phase and a neutral wire?
A) Overload
B) Short circuit
C) Ground fault
D) Corona discharge
Rationale: A short circuit is an overcurrent path of low resistance connecting two
points of different potential.
12. What size equipment grounding conductor is required for a branch circuit protected
by a 15-ampere device?
A) 14 AWG
B) 12 AWG
C) 10 AWG
D) 8 AWG
Rationale: A 15-ampere overcurrent device requires a minimum 14 AWG copper
equipment grounding conductor.
13. What is the synchronous speed of a 4-pole AC motor operating at a frequency of 60
Hz?
A) 1200 RPM
B) 1800 RPM
C) 3600 RPM
D) 900 RPM
Rationale: Speed = (120 x Frequency) / Poles. Therefore, (120 x 60) / 4 = 1800
RPM.
14. How are ammeters connected relative to the load being measured?
A) In series
B) In parallel
C) In bridge configuration
, D) In bypass shunt
Rationale: Ammeters have low internal resistance and must be connected in series
to measure total circuit current.
15. What is the minimum clear working space depth required in front of live electrical
equipment operating at 120V to ground?
A) 3 feet
B) 4 feet
C) 5 feet
D) 6 feet
Rationale: For voltages to ground up to 150V, the clear working depth must be a
minimum of 3 feet.
16. What device automatically opens a circuit when a current imbalance between hot
and neutral wires exceeds 5 milliamperes?
A) Circuit breaker
B) Thermal overload relay
C) Ground-Fault Circuit-Interrupter
D) Fuse
Rationale: A Class A GFCI device is designed to trip when a ground fault fault
leakage ranges between 4 to 6 mA.
17. What type of enclosure is specifically designed for indoor use to protect workers
against dust and falling dirt?
A) NEMA 1
B) NEMA 3R
C) NEMA 4X
D) NEMA 7
Rationale: NEMA 1 enclosures are intended for general-purpose indoor use to
provide basic protection.
18. What is the total resistance of two 10-ohm resistors connected in a parallel
configuration?
A) 20 Ohms
B) 10 Ohms
C) 5 Ohms
D) 2.5 Ohms
Rationale: For equal parallel resistors, divide the resistance by the quantity of
components ( = 5 ohms).
19. Which formula correctly expresses Ohm’s Law for calculating current?
A) I = V / R
B) I = V x R
