commercial load calculations-2

Question 1: what is the calculated load of 5 work stations, which has 5 ft multi outlets ( not used simultaneously) and 3 ft multi outlets (used simultaneously)?

• 3.6 KVA
• 9 KVA
• 2.4 KVA
• 5 KVA

NEC Reference: NEC 220.14

Question 2: what is the receptacle calculated load for a 19000 sqft building which contains one hundred eighty 15A and 20 A , 120 V receptacles?

• 21,200 VA
• 18,000 VA
• 19,600 VA
• 23,500 VA

NEC Reference: NEC 220.14(1)

Question 3: A sign outlet of an commercial occupancy accessible to pedestrians is a ............... as per NEC.

• continuous
• non-continuous

Question 4: What is the minimum load for the required exterior sign or outline lighting for a commercial occupancy as per NEC?

• 1200 VA
• 1500 VA
• 10,00 VA
• 1800 VA

NEC Reference: NEC 220.14(F)

Question 5: For electrical sign what is minimum feeder/service conductor calculated load?

• 1500 VA
• 1200 VA
• 1000 VA
• 1800 VA

NEC Reference: NEC 220.14(F)

Question 6: An all-electric restaurant has a completed load 150 KVA connected to 120/208 V three phase supply. What is the required service conductor ampacity?

• 444 A
• 333 A
• 416 A
• 577 A

NEC Reference: NEC 220.88

Question 7: What is grounded service conductor size required for all-electric restaurant (120 V / 208 V three phase) which has a total connected load of 200 KVA?

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

NEC Reference: NEC 220.88

Question 8: The primary rating of a motor-generator arc welder is 30 A with a duty cycle of 30 percentage. What is the minimum size branch circuit conductor for the welder?

• 12 AWG
• 10 AWG
• 14 AWG
• 8 AWG

NEC Reference: NEC 630.11(A)

Question 9: A store has a 40 ft multi-outlet assembly where the outlets are NOT likely to be used at the same time. What is the calculated load?

• 1440 VA
• 7200 VA
• 720 VA
• 2880 VA

NEC Reference: NEC 220.14(H)

Question 10: A commercial building has 300 general-use receptacle outlets. What is the calculated receptacle load after applying the Table 220.44 demand factor?

• 54,000 VA
• 32,000 VA
• 27,000 VA
• 44,000 VA

NEC Reference: NEC 220.44

Question 11: Unless a larger load is known, what VA value does the NEC assign to each general-use receptacle outlet (single or multiple on one yoke) in a load calculation?

• 120 VA
• 180 VA
• 240 VA
• 360 VA

NEC Reference: NEC 220.14(A)

Question 12: A dwelling unit has a connected general lighting and receptacle load of 18,000 VA. What is the calculated demand load after applying the Table 220.42 demand factor?

• 18,000 VA
• 6300 VA
• 8250 VA
• 9000 VA

NEC Reference: NEC 220.42

Question 13: A dwelling unit kitchen has the minimum required two 20 A small-appliance branch circuits. What load must be added to the load calculation for these circuits (before any demand factor)?

• 1500 VA
• 3000 VA
• 4500 VA
• 6000 VA

NEC Reference: NEC 220.52(A)

Question 14: A dwelling unit has TWO 12 kW (or less) household electric ranges. What is the combined calculated demand load per NEC Table 220.55?

• 16 kW
• 8 kW
• 11 kW
• 24 kW

NEC Reference: NEC 220.55

Question 15: When performing a service or feeder load calculation, a motor load is NOT calculated using the general Article 220 unit values. Instead it is sized per:

• NEC Article 430 (Motors)
• NEC Article 220 general lighting load table only
• NEC Article 250 (Grounding)
• NEC Article 300 (Wiring Methods)

NEC Reference: NEC Article 430

Question 16: A branch circuit supplies a continuous load of 16 A. What is the minimum conductor and overcurrent device ampacity required?

• 16 A
• 18 A
• 20 A
• 25 A

NEC Reference: NEC 210.19(A)(1)

Question 17: A feeder supplies a 20 A continuous load and a 30 A noncontinuous load. What is the minimum feeder ampacity required?

• 50 A
• 55 A
• 62.5 A
• 40 A

NEC Reference: NEC 215.2(A)(1)

Question 18: A feeder is protected by a 100 A rated overcurrent device. What is the minimum size copper equipment grounding conductor (EGC) required?

• 10 AWG
• 8 AWG
• 6 AWG
• 4 AWG

NEC Reference: NEC 250.122

Question 19: Per NEC 230.42, ungrounded service-entrance conductors must have an ampacity that is:

• Not less than the calculated load and often not less than the service disconnect rating
• Always exactly half of the calculated load
• Based only on the wire insulation color
• Not related to the calculated load at all

NEC Reference: NEC 230.42

Question 20: Per NEC Article 100, a "continuous load" is a load where the maximum current is expected to continue for:

• 30 minutes or more
• 1 hour or more
• 3 hours or more
• 24 hours or more

NEC Reference: NEC Article 100

Question 21: A commercial load draws 80 kW of real power at a power factor of 0.8. What is the apparent power in kVA?

• 64 kVA
• 80 kVA
• 100 kVA
• 125 kVA

Question 22: A small restaurant has a connected load of 60 kVA on a 208 V three-phase supply. What is the service conductor ampacity required (before any demand factor)?

• 288 A
• 167 A
• 96 A
• 333 A

Question 23: When adding new load to an existing service, NEC 220.87 allows the existing load to be determined using:

• Actual maximum demand data recorded over a 1-year period
• A guess made by the property owner
• The nameplate rating of the largest single appliance only
• Data is never allowed; a full new calculation is always required

NEC Reference: NEC 220.87

Question 24: Why does the NEC allow a demand factor (a value of 1.0 or less) to be applied to certain connected loads during a service or feeder calculation?

• Because not all connected equipment runs at the same time, so real demand is usually lower
• Because the NEC wants conductors to be undersized to save copper
• Demand factors only exist for residential dwellings, never commercial
• Demand factors always increase the calculated load above the connected load

Question 25: For a household electric range rated MORE than 12 kW but not more than 27 kW, Table 220.55 Note 1 requires the demand value to be:

• Increased by 5% for each kW (or major fraction) over 12 kW
• Decreased by 5% for each kW over 12 kW
• Always fixed at 8 kW no matter the actual rating
• Not adjusted at all, regardless of rating

NEC Reference: NEC 220.55