Service Entrance, Feeder and Branch Circuit calculations 2
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Service Entrance , Branch circuit conductors and Feeder conductor theory and practice test 2
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Question 1 of 10
1. Question
1 pointsTwo transformers each are rated for 480 VA are connected from a 120 volts single feeder. One utilization equipment rated 80 VA is also fed from the same feeder circuit. Which of the following is the minimum ampere rating of feeder?
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Refer : 215.52 (B)( 2)
Total load on a feeder = 480 + 480 + 1.25 * 80 = 1060 VAFeeder circuit ampere rating = 1060/120 = 8.83 amperes ( 9 amperes)

Question 2 of 10
2. Question
1 pointsIf the dwelling unit rated lighting load is 4000 VA, which of the following is the total branch circuit load calculated for general illumination?
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Refer : Table 220.42
first 3000 VA => 3000 * 100% = 3000
from 3000 – 120000 VA = 1000 * 35% = 350
3000 + 350 = 3350 VA 
Question 3 of 10
3. Question
1 pointsWhat is the branch circuit load calculated for show window which has horizontal size of 10 feet?
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Refer : 220.43 (A)
For show window lighting the minimum load should be 200 VA / Linear foot
total load = 10 * 200 = 2000 VA 
Question 4 of 10
4. Question
1 pointsHow many minimum number of 15amp No.14 branch circuits are required to provide lighting load for a 2000 sq.ft dwelling unit operated at 120 volts?
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For lighting load per sq.ft = 3 Watts
so total lighting load = 2000 * 3 = 6000 watts
total load on single branch circuit at 120 volts = 120 * 15 = 1800 watts
So minimum branch circuits = 6000/1800 = 3.3 (4 without any over load) 
Question 5 of 10
5. Question
1 pointsA retail shop consists of 20 15 amp duplex receptacles. which of the calculated load of duplex receptacles in retail shop?
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Refer : NEC 220.14(I)
Expect dwelling unit, branks and office building (with some conditions), in all other units the calculated load is not less than 180 voltamperes for each single or multiple receptacles on one yoke.
So total calculated load = 20 * 180= 3600 voltamperes. 
Question 6 of 10
6. Question
1 pointsHow many maximum number of receptacles are permitted on a 20 ampere breaker supplied by 120 volts power source in a shopping complex?
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Refer : 220.14 (I)
Minimum calculated load of receptacle other than dwelling unit is 180 voltampere
So ampere rating at 120 volts source voltage = 180 / 120 = 1.5 amperesTotal receptacles permitted on 20 ampere breaker = 20/1.5 = 13. ( breaker should not be overloaded)

Question 7 of 10
7. Question
1 pointsIf a single piece of equipment consists of five receptacles on it, what is the total calculated load?
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Refer : NEC 220.14 (I)
If a single equipment consists of four or more receptacles on it , the minimum load calculated shall not be less than 90 voltampere for each.Total calculated load = 5 * 90 = 450 VoltAmpere.

Question 8 of 10
8. Question
1 pointsHow many number of 15 ampere 2 wire branch circuits are required for general lighting load in a 120/240 volts 1200 sq.ft dwelling unit?
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Refer: NEC Table 220.12
The Minim general lighting load per sq.ft in dwelling unit = 3 voltampere
Total lighting load = 1200 * 3 = 3600 voltampere
General lighting load ampere rating at 120 volts = 3600/120 = 30 ampere
The minimum number of 15 ampere branch circuits required = 30/12 = 2.5 = 3 
Question 9 of 10
9. Question
1 pointsWhat is the minimum laundry circuit load that shall be considered for each 2wire laundry branch circuit in dwelling unit?
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Refer : NEC 220.52 (B)

Question 10 of 10
10. Question
1 pointsThe maximum unbalanced load of a service or feeder is the maximum net calculated load between hot and neutral conductor.
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Refer: NEC 220 .61