Journeyman Electrician’s Exam Journeyman Electrician's Service and Feeder Calculations 2

Question 1

A single-family dwelling has a 200-amp, 240V service. What is the minimum service entrance conductor size required using 75°C copper conductors per NEC Table 310.12?

Accepted Answer

2/0 AWG copper

Answer

3/0 AWG copper

Answer

4/0 AWG copper

Answer

250 kcmil copper

Question 2

When calculating the demand load for electric ranges rated over 12 kW but not exceeding 27 kW in a dwelling, the NEC allows a maximum demand of 8 kW for one range, plus what percentage per additional kW over 12 kW?

Accepted Answer

5%

Answer

3%

Answer

10%

Answer

15%

Question 3

A commercial building has 50 kVA of fluorescent lighting. Using standard demand factors, what minimum amperage feeder is required on a 208Y/120V, 3-phase system?

Accepted Answer

139 A

Answer

96 A

Answer

166 A

Answer

250 A

Question 4

Per NEC 220.82, the optional calculation for a single-family dwelling applies the first load increment of 10 kVA at 100%, then applies what demand factor to the remainder?

Accepted Answer

70%

Answer

50%

Answer

60%

Answer

80%

Question 5

What is the minimum feeder size for a 60A, 240V single-phase load that operates continuously for more than 3 hours?

Accepted Answer

75 A

Answer

60 A

Answer

80 A

Answer

100 A

Question 6

In a multi-family dwelling with 20 units, each having a 12 kW electric range, what demand factor does NEC Table 220.55 Column C assign to 20 ranges?

Accepted Answer

38%

Answer

35%

Answer

41%

Answer

44%

Question 7

When sizing a service for a 2,400 sq ft single-family dwelling using the standard calculation method, what is the minimum general lighting load at 3 VA per square foot?

Accepted Answer

7,200 VA

Answer

5,400 VA

Answer

9,600 VA

Answer

12,000 VA

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