NCCER Electrical Level 3 Module 1 Load Calculations and Branch Feeder Circuits Exam|Questions with Correct Answers| Verified| Latest Update

NCCER Electrical Level 3 Module 1 Load
Calculations and Branch Feeder Circuits
Exam|Questions with Correct Answers|
Verified| Latest Update

Question 1
According to the NEC®, the ampacity of branch circuit conductors must
be derated when there are more than how many current-carrying
conductors in a raceway?

• A) 2
• B) 3
• C) 4
• D) 5

Correct ,,,,Answer,,,,: B
Rationale: NEC 310.15(C)(1) requires ampacity adjustment (derating)
when more than three current-carrying conductors are present in a
raceway or cable.




Question 2
Air conditioning overcurrent protective devices can never exceed what
percentage of the motor-rated load current or the branch circuit selection
current (whichever is greater)?

• A) 125%

, • B) 175%
• C) 225%
• D) 300%

Correct ,,,,Answer,,,,: C
Rationale: NEC 440.22(A) permits the overcurrent protection device for
an air conditioning unit to be increased up to 225% of the motor-rated
load current or branch circuit selection current.




Question 3
Continuous loads are calculated at what percentage of the maximum
current rating of the overcurrent device?

• A) 80%
• B) 100%
• C) 125%
• D) 150%

Correct ,,,,Answer,,,,: A
Rationale: Continuous loads (expected to last 3+ hours) are calculated
at 80% of the overcurrent device rating (or conversely, the load must be
multiplied by 125%).




Question 4
For a given load and length, the branch circuit voltage drop should not
exceed:

• A) 1%

, • B) 2%
• C) 3%
• D) 5%

Correct ,,,,Answer,,,,: C
Rationale: NEC 210.19(A) Informational Note No. 4 recommends that
branch circuit voltage drop not exceed 3% for the branch circuit itself.




Question 5
For resistance welders, the rating for the overcurrent protection device
should not exceed what percentage of the primary current rating of the
welder?

• A) 200%
• B) 250%
• C) 300%
• D) 400%

Correct ,,,,Answer,,,,: C
Rationale: NEC 630.32 allows overcurrent protection for resistance
welders up to 300% of the primary current rating due to high inrush
currents.




Question 6
Show window lighting is calculated at 200VA per linear foot plus:

• A) 100%
• B) 125%

, • C) 150%
• D) 180%

Correct ,,,,Answer,,,,: B
Rationale: Show window lighting is considered a continuous load,
requiring an additional 125% multiplier per NEC 220.14(G).




Question 7
The allowable ampacity for eleven No. 12 THHN copper conductors in a
cable must be adjusted by:

• A) 80%
• B) 70%
• C) 60%
• D) 50%

Correct ,,,,Answer,,,,: D
Rationale: NEC Table 310.15(C)(1) requires derating to 50% when there
are 10-20 current-carrying conductors.




Question 8
The load for 10' of multi-outlet assembly used to supply several loads
simultaneously is:

• A) 1,200VA
• B) 1,800VA
• C) 2,000VA
• D) 2,400VA