NEC Code Questions Practice Test-15

Question 1: What is the maximum voltage drop recommended by NEC for both branch conductor and feeder conductor?

• 3 %
• 4 %
• 5 %
• 6 %

Question 2: The connected load of all-electric restaurant is 140 KVA which is supplied by a 120/208 V three phase supply. What is the required service conductor ampacity?

• 311 amperes
• 538 amperes
• 423 amperes
• 621 amperes

NEC Reference: NEC 220.88

Question 3: What size branch circuit protection is required for 20 A motor compressor connected to 240 volts single phase supply?

• 35 amperes
• 20 amperes
• 25 amperes
• 30 amperes

NEC Reference: NEC 440.22(A)

Question 4: A 30 ampere branch circuit with heavy duty lamp holders is permitted to supply fixed lightening units in .......................

• single family dwelling unit
• multi family dwelling unit
• any occupancy
• any occupancy other than dwelling unit

NEC Reference: NEC 210.23(B)

Question 5: What is the minimum general lightening load required for 1500 square foot single family dwelling unit as permitted by NEC?

• 4500 VA
• 4800 VA
• 3000 VA
• 1500 VA

NEC Reference: NEC 220.12

Question 6: What size service conductor is required for a 120/240 volts single phase with a demand load of 48 KVA?

• 200 amperes
• 150 amperes
• 100 amperes
• 250 amperes

Question 7: In calculating the load for a commercial kitchen with one electric appliance, which of the following demand factor is allowed?

• 100%
• 80%
• 90%
• 75%

NEC Reference: NEC 220.56

Question 8: The  ampacity of 2/0 THHN conductor is 195 amperes ( 90⁰ C). What is the maximum allowable ampacity of 2/0 THHN conductor in a conduit with 5 other current carrying conductors?

• 156 amperes
• 136 amperes
• 195 amperes
• 185 amperes

NEC Reference: NEC 310.15(B)(3)

Question 9: An isolated ground receptacle shall be identified by :................

• An orange triangle
• A permanent seal
• A green dot
• A cross sign

NEC Reference: NEC 406.3(D)

Question 10: If a panel board contains a snap switch with rating of 30 amperes must be protected not in excess of :

• 200 amperes
• 30 amperes
• 150 amperes
• 300 amperes

NEC Reference: NEC 408.36(A)