NEC Code Questions: Commercial Load Calculations1
Quizsummary
0 of 9 questions completed
Questions:
 1
 2
 3
 4
 5
 6
 7
 8
 9
Information
Free NEC Code Questions and Answers ( Commercial Load Calculations)
You have already completed the quiz before. Hence you can not start it again.
Quiz is loading...
You must sign in or sign up to start the quiz.
You have to finish following quiz, to start this quiz:
Results
0 of 9 questions answered correctly
Your time:
Time has elapsed
You have reached 0 of 0 points, (0)
Average score 

Your score 

Categories
 Not categorized 0%
 1
 2
 3
 4
 5
 6
 7
 8
 9
 Answered
 Review

Question 1 of 9
1. Question
1 pointsAfter the demand factor is applied , what is the general lighting load of a hospital which is having 80,000 sq ft area?
Correct
Incorrect
As per NEC Table 220.12 , The unit general lighting load for hospital is 2 VA per sq ft.
So total lighting load of hospital = 80,000 * 2 = 1,60,000 VA
As per NEC Table 220.42 The lighting load demand factors are as follows
First 50000 or less 40% i.e
50,000 * 0.4 = 20000
Reaming is 20%
1,10,000 * 20 = 22000
So total lighting load after demand factor is applied = 20000 + 22000 = 42000 VA

Question 2 of 9
2. Question
1 pointsThe feeder/service demand load for show window lighting must be …………….. per each linear ft.
Correct
Incorrect
Refer: NEC 220.14(G)

Question 3 of 9
3. Question
1 pointsThe show window lighting must be treated as ……………….
Correct
Incorrect

Question 4 of 9
4. Question
1 pointsIn a non dwelling unit the load for general use receptacle is ………….. per yoke
Correct
Incorrect
Refer: NEC 220.14(G)

Question 5 of 9
5. Question
1 pointsHow many number of receptacle outlets are permitted on a commercial building circuit which is having a computed lighting load of 3400 VA?
Correct
Incorrect
Refer: NEC 220.14(G)
The minimum receptacle load per yoke for a nondwelling unit is 180 VA.
Number of receptacles permitted = 3400 / 180 = 18.8 or 19 receptacles.

Question 6 of 9
6. Question
1 pointsThe recreational park is having fifteen 20 A supply facilities, ten 20A and 30 A supply facilities and twenty five 50A supply facilities is operated at 120/240 V single phase. What is the service demand load for the recreational park?
Correct
Incorrect
The service demand of recreational park can be calculated based on NEC Table 551.73(A).
Fifteen 20 A supply facilities = 15 * 2400 VA = 36000 VA
Ten 20A and 30 A supply facilities = 10 * 3600 VA = 36000 VA
Twenty Five 50 A supply facilities = 25 * 9600 VA = 2,40,000 VA
Total connected load for 45 sites = 36000 + 36000 + 2,40,000 = 3,12,000 VA
Demand Load = 3,12,000 VA x 0.41= 1,27,920 VA
I = VA / E
I = 1,27,920 / 240 = 533 A

Question 7 of 9
7. Question
1 pointsThe mobile home park which has 25 site facilities is fed from a 240 V service feeder. What is the demand load for mobile home park?
Correct
Incorrect
Since no calculated is mentioned, as per NEC 550.31, 16000 VA per site can be used for service demand calculations.
Total connected load = 25 * 16000 VA = 4,00,000 VA
Refer: NEC Table 550.31
Demand Load = 4,00,000 * 0.24 = 96000 VA
I = 90000/ 240 = 400 A

Question 8 of 9
8. Question
1 pointsWhat is general lighting unit load per square feet for hotels and guest room?
Correct
Incorrect
Refer: NEC Table 220.12
2 VA / sq ft for hotels

Question 9 of 9
9. Question
1 pointsWhat is the load of 12000 sq ft warehouse after the demand factors are applied?
Correct
Incorrect
Refer: NEC Table 220.12
The general lighting unit for ware house is ¼ VA per sq ft
12000 * ¼ = 3000 VA
Refer: NEC Table 220.42
100 % demand factor is applied to first 12000 VA
So total demand load = 3000 VA