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26301-20 - Load Calculations: Questions & A+ Answers
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26301-20 - Load Calculations: Questions & A+ Answers
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26301-20 - Load Calculations: Questions & A+ AnswersHow long does a load operate to be determined continuous and what % is it
figured at? Right Ans - 3 hours; 125%
What NEC table is used for calculating lighting loads in non-dwelling
occupancies, expressed as a units per square foot? Right Ans - 220.12
How many VA are required by 2020 NEC for lighting in a 10,500 sq. ft. library?
Right Ans - 15,750 VA
What is the square root of 3? Right Ans - 1.732
What percentage are Noncontinuous loads factored as? Right Ans - 100%
What percentage are Continuous loads factored as? Right Ans - 125%
If a utilization equipment is fastened in place and connected to other loads,
the fastened in place equipment cannot exceed _______ of the branch circuit
ampere rating? Right Ans - 50%
What NEC Table covers conductor adjustment factors for more than 3
conductors in a conduit? Right Ans - 310.15 (C)(1)
What NEC Table covers temperature correction factors based upon ambient
temperatures higher than 30°C (86°F) Right Ans - 310.15(B)(1)
What NEC Table covers the ampacities of insulated conductors when not more
than 3 current carrying conductors? Right Ans - 310.16
Based on 2002 NEC Table 310.15(C)(1), What is the adjustment factor for the
11 current carrying conductors in a raceway? Right Ans - 50
What is the derating factor of a 75℃ rated conductor in an ambient
temperature of 58℉? Right Ans - 1.15
What is the following Formula: 2 x L x R x I / 1,000? Right Ans - Voltage
drop for single phase circuits using conductor resistance
, In the formula 2 x L x K x 1/CM, what does K stand for? Right Ans - A
mathematical constant for resistance depending on conductor material
What is the difference between the single phase and three phase voltage drop
formulas? Right Ans - Single phase uses the number 2, three phase uses √3
Which section in the 2020 NEC can you find the area of a conductor used for
voltage drop? Right Ans - Chapter 9 Table 8
Using the CM formula, What % VD is present on a 1∅, 240v, 50A circuit using
#4 CU for 250'? Right Ans - 3.21%
What is the total load center length for the following loads- LOAD 1= 80'x
100A, LOAD 2= 75' x 150A, LOAD 3= 50' x 175A? Right Ans - 65.88'
What is the minimum size conductor will be used for a 3∅,208v, 65A circuit at
350' to not exceed 3% VD? Right Ans - #1 AWG
What is the total ampacity of a 120v 1∅ circuit with 3 - 250 VA loads that run
for 5 hours and 6- 2.5amp loads that run intermittently? Right Ans - 22.8 A
What is the required circuit ampacity for a 5,400 W, 480 V, 3∅ load? Right
Ans - 6.49 A
What is the ampacity of a 480v 10.5 kW continuous load? Right Ans - 16 A
How do you determine VA? Right Ans - Both A & C
How can you determine Amperage from VA? Right Ans - Divide VA by
Voltage
What NEC section covers loads for recessed lighting fixtures? Right Ans -
220.14 (D)
Using the 2020 NEC, which code section gives you the VA for a 120v
receptacle? Right Ans - 220.14 (I)
How many duplex receptacles can be connected on a 20A 120v circuit
Right Ans - 13
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