NEC Code Questions: Commercial Load Calculations-1
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Free NEC Code Questions and Answers ( Commercial Load Calculations)
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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?
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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
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Question 2 of 9
2. Question
1 pointsThe feeder/service demand load for show window lighting must be …………….. per each linear ft.
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Refer: NEC 220.14(G)
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Question 3 of 9
3. Question
1 pointsThe show window lighting must be treated as ……………….
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Question 4 of 9
4. Question
1 pointsIn a non dwelling unit the load for general use receptacle is ………….. per yoke
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Refer: NEC 220.14(G)
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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?
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Refer: NEC 220.14(G)
The minimum receptacle load per yoke for a non-dwelling unit is 180 VA.
Number of receptacles permitted = 3400 / 180 = 18.8 or 19 receptacles.
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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?
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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
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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?
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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
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Question 8 of 9
8. Question
1 pointsWhat is general lighting unit load per square feet for hotels and guest room?
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Refer: NEC Table 220.12
2 VA / sq ft for hotels
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Question 9 of 9
9. Question
1 pointsWhat is the load of 12000 sq ft warehouse after the demand factors are applied?
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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