NEC Code Questions Practice Test-9

Question 1: what size of conductor must be used to protect against over current for a continuous load of 22 amperes at 75⁰C?

• 10 THWN
• 12 THWN
• 16 THWN
• 8 THWN

NEC Reference: NEC 27.5

Question 2: What size of feeder conductors are required for a dwelling unit which has a calculated load of 240 A. The service disconnect is rated for 250 A and feeder conductors carry entire load of the dwelling unit?

• 1/0 AWG
• 2/0 AWG
• 3/0 AWG
• 4/0 AWG

NEC Reference: NEC 207.5

Question 3: What size branch circuit conductor is required for a 4000 W, 240 electric water heater?

• 12 AWG
• 14 AWG
• 8 AWG
• 10 AWG

NEC Reference: NEC 422.10(A)

Question 4: How many number of 500 kcmil THWN conductors that can be installed in a 4 in. * 4 in. wireway?

• 4 conductors
• 5 conductors
• 6 conductors
• 7 conductors

NEC Reference: NEC 376.22(A)

Question 5: If a service is fed by three parallel sets of 400 kcmil conductors, what is the required conductor size for GEC?

• 3/0 AWG
• 2/0 AWG
• 2 AWG
• 4 AWG

NEC Reference: NEC 250.166

Question 6: Which of the following is the size of single supply-side bonding jumper is required for three metal raceways, each containing 300 kcmil service conductors?

• 2 AWG
• 3 AWG
• 1/0 AWG
• 1 AWG

NEC Reference: NEC 250.102(C)(1)

Question 7: If the length doesn’t exceed ………. Feet the cord and plug connections are allowed for swimming pool pump motors?

• 3 feet
• 5 feet
• 10 feet
• 8 feet

Question 8: After the demand factor is applied , what is the general lighting load of a hospital which is having 80,000 sq ft area?

• 42,000 VA
• 1,60,000 VA
• 58,000 VA
• 82, 000 VA

NEC Reference: NEC 220.12

Question 9: A 115/230 delta configured three phase transformer is rated at 45 KVA. What is its high-leg voltage of the transformer secondary?

• 230 volts
• 399 volts
• 199 volts
• 208 volts

Question 10: What is the maximum size over current device is required for a 4200 W, 240 V electric water heater connected in a building.

• 25 A
• 30 A
• 35 A
• 40 A

NEC Reference: NEC 26.25