NYC DCAS Electrician Civil Service Exam Prep Test Bank –Actual Complete
Questions & Answers with Comprehensive Technical, Code, & Safety Rationales –
National Electrical Code & NYC DOB Amendments Aligned (Latest 2026/2027 Edition)
INSTANT PDF DOWNLOAD
Section 1: Electrical Code, Calculations, & Wire Sizing Metrics
1. According to the National Electrical Code (NEC) and NYC Amendments, what is the
minimum trade size for rigid metal conduit (RMC) allowed for a standard commercial
electrical service entry?
A) 1/4 inch
B) 1/2 inch
C) 3/4 inch
D) 1 inch
NEC Section 344.20 states that the minimum size of RMC permitted is 1/2 inch trade size.
While structural demands often require larger raceways, this represents the absolute code
floor.
2. What is the calculated total continuous load capability, in volt-amperes (VA), for a
20-ampere, 120-volt single-phase branch circuit supplying public lighting loads?
A) 2,400 VA
B) 1,920 VA
C) 1,200 VA
D) 2,000 VA
Continuous loads must not exceed 80% of the branch circuit rating. Using Ohm's Law:
120V × 20A = 2,400 VA maximum capacity. Applying the continuous load factor safety
margin: 2,400 VA × 0.80 = 1,920 VA.
,3. When installing deep pull boxes in an EMT conduit run containing No. 4 AWG or
larger conductors, what is the minimum horizontal length required for a straight pull
under the NEC?
A) Four times the trade diameter of the largest conduit
B) Eight times the trade diameter of the largest conduit entry
C) Six times the trade diameter plus the sum of all other entries
D) Twelve inches flat across all configurations
NEC Section 314.28(A)(1) specifies that for straight pulls involving conductors No. 4 AWG
or larger, the length of the box must be at least eight times the trade size of the largest
raceway entering the box.
4. What is the maximum allowable voltage drop recommended by the NEC and NYC
Code for a branch circuit supplying sensitive computer equipment?
A) 1%
B) 3%
C) 5%
D) 10%
The NEC recommends that voltage drop on a branch circuit should not exceed 3%, and the
total combined voltage drop on both the feeder and branch circuit should not exceed 5% to
maintain equipment efficiency.
5. Which type of THHN insulation material is rated specifically for installation within
wet locations inside structural building conduits?
A) THHN bare copper
B) THWN (or THHN/THWN-2 multi-rated wire)
C) TW raw composition
D) THHN dry-only nylon
,The "W" in THWN stands for Moisture-Resistant/Wet. Standard THHN is rated for dry and
damp locations only; multi-rated THHN/THWN-2 is legally required for wet underground
conduit runs.
6. According to the NEC, what is the maximum number of 90-degree bends allowed
between any two pull points or boxes in a single run of rigid PVC conduit?
A) Two bends (180 degrees total)
B) Three bends (270 degrees total)
C) Four bends (360 degrees total)
D) Six bends (540 degrees total)
NEC Section 352.26 states that a conduit run must not contain more than the equivalent of
four quarter bends (360 degrees total) between pull points to prevent excessive wire friction
and insulation damage.
7. What is the baseline adjustment multiplier used to derate the ampacity of structural
conductors when installing four to six active current-carrying wires inside a single
enclosed raceway?
A) 90%
B) 80%
C) 70%
D) 50%
NEC Table 310.15(C)(1) requires an 80% adjustment factor when 4 to 6 current-carrying
conductors are bundled in a raceway, accounting for cumulative heat buildup inside the
conduit enclosure.
8. What is the minimum clear working space depth required in front of an electrical
distribution panel operating at 480/277 volts to ground under Condition 1 (exposed
live parts on one side, grounded parts on the other)?
, A) 3 feet
B) 3.5 feet
C) 4 feet
D) 5 feet
For systems operating between 151 and 600 volts to ground, NEC Table 110.26(A)(1)
mandates a minimum clear working depth of 3.5 feet for Condition 2, or 3 feet for Condition
1.
9. Which size of solid copper grounding electrode conductor (GEC) is required for a
200-ampere single-phase residential service supplied by 2/0 AWG copper entrance
wires?
A) No. 8 AWG
B) No. 4 AWG
C) No. 2 AWG
D) 1/0 AWG
According to NEC Table 250.66, when the largest ungrounded service-entrance conductor
is 2/0 AWG copper, the minimum size required for the copper grounding electrode
conductor is No. 4 AWG.
10. When installing a continuous run of metal wireway overhead, what is the
maximum allowable horizontal distance between structural support brackets under
the NEC?
A) 3 feet
B) 5 feet
C) 5 feet
D) 10 feet
NEC Section 376.30(A) states that metal wireways must be supported securely at intervals
Questions & Answers with Comprehensive Technical, Code, & Safety Rationales –
National Electrical Code & NYC DOB Amendments Aligned (Latest 2026/2027 Edition)
INSTANT PDF DOWNLOAD
Section 1: Electrical Code, Calculations, & Wire Sizing Metrics
1. According to the National Electrical Code (NEC) and NYC Amendments, what is the
minimum trade size for rigid metal conduit (RMC) allowed for a standard commercial
electrical service entry?
A) 1/4 inch
B) 1/2 inch
C) 3/4 inch
D) 1 inch
NEC Section 344.20 states that the minimum size of RMC permitted is 1/2 inch trade size.
While structural demands often require larger raceways, this represents the absolute code
floor.
2. What is the calculated total continuous load capability, in volt-amperes (VA), for a
20-ampere, 120-volt single-phase branch circuit supplying public lighting loads?
A) 2,400 VA
B) 1,920 VA
C) 1,200 VA
D) 2,000 VA
Continuous loads must not exceed 80% of the branch circuit rating. Using Ohm's Law:
120V × 20A = 2,400 VA maximum capacity. Applying the continuous load factor safety
margin: 2,400 VA × 0.80 = 1,920 VA.
,3. When installing deep pull boxes in an EMT conduit run containing No. 4 AWG or
larger conductors, what is the minimum horizontal length required for a straight pull
under the NEC?
A) Four times the trade diameter of the largest conduit
B) Eight times the trade diameter of the largest conduit entry
C) Six times the trade diameter plus the sum of all other entries
D) Twelve inches flat across all configurations
NEC Section 314.28(A)(1) specifies that for straight pulls involving conductors No. 4 AWG
or larger, the length of the box must be at least eight times the trade size of the largest
raceway entering the box.
4. What is the maximum allowable voltage drop recommended by the NEC and NYC
Code for a branch circuit supplying sensitive computer equipment?
A) 1%
B) 3%
C) 5%
D) 10%
The NEC recommends that voltage drop on a branch circuit should not exceed 3%, and the
total combined voltage drop on both the feeder and branch circuit should not exceed 5% to
maintain equipment efficiency.
5. Which type of THHN insulation material is rated specifically for installation within
wet locations inside structural building conduits?
A) THHN bare copper
B) THWN (or THHN/THWN-2 multi-rated wire)
C) TW raw composition
D) THHN dry-only nylon
,The "W" in THWN stands for Moisture-Resistant/Wet. Standard THHN is rated for dry and
damp locations only; multi-rated THHN/THWN-2 is legally required for wet underground
conduit runs.
6. According to the NEC, what is the maximum number of 90-degree bends allowed
between any two pull points or boxes in a single run of rigid PVC conduit?
A) Two bends (180 degrees total)
B) Three bends (270 degrees total)
C) Four bends (360 degrees total)
D) Six bends (540 degrees total)
NEC Section 352.26 states that a conduit run must not contain more than the equivalent of
four quarter bends (360 degrees total) between pull points to prevent excessive wire friction
and insulation damage.
7. What is the baseline adjustment multiplier used to derate the ampacity of structural
conductors when installing four to six active current-carrying wires inside a single
enclosed raceway?
A) 90%
B) 80%
C) 70%
D) 50%
NEC Table 310.15(C)(1) requires an 80% adjustment factor when 4 to 6 current-carrying
conductors are bundled in a raceway, accounting for cumulative heat buildup inside the
conduit enclosure.
8. What is the minimum clear working space depth required in front of an electrical
distribution panel operating at 480/277 volts to ground under Condition 1 (exposed
live parts on one side, grounded parts on the other)?
, A) 3 feet
B) 3.5 feet
C) 4 feet
D) 5 feet
For systems operating between 151 and 600 volts to ground, NEC Table 110.26(A)(1)
mandates a minimum clear working depth of 3.5 feet for Condition 2, or 3 feet for Condition
1.
9. Which size of solid copper grounding electrode conductor (GEC) is required for a
200-ampere single-phase residential service supplied by 2/0 AWG copper entrance
wires?
A) No. 8 AWG
B) No. 4 AWG
C) No. 2 AWG
D) 1/0 AWG
According to NEC Table 250.66, when the largest ungrounded service-entrance conductor
is 2/0 AWG copper, the minimum size required for the copper grounding electrode
conductor is No. 4 AWG.
10. When installing a continuous run of metal wireway overhead, what is the
maximum allowable horizontal distance between structural support brackets under
the NEC?
A) 3 feet
B) 5 feet
C) 5 feet
D) 10 feet
NEC Section 376.30(A) states that metal wireways must be supported securely at intervals
