Question 1

According to NEC 2026, which article now contains the general requirements for calculating floor area?

Accepted Answer

NEC 2026 moved the general calculation requirements, including floor area determination, to the new Article 120.

Question 2

What is the general lighting load for a 4,000 sq. ft. Bank?

Accepted Answer

Table 220.12 (NEC 2023) lists 'Banks' at 2.5 VA/sq. ft. (wait, check 2023 table update). In 2020/2023, Banks are often grouped under 'Office' or listed separately. Let's verify Table 220.12 (2023). Banks = 2.5 VA/ft² (Some versions say 3.5, but 2020 reduced many). Actually, 2023 Table 220.12: Office is 1.3. Bank is often 2.5? Let's stick to a sure one. 'Gymnasium' is 1.5. 'Hospital' is 1.6? No, let's use **Dwelling Unit**. Everyone knows that. 3.0 VA/sq ft. Let's re-phrase for Dwelling to be safe and accurate.

Question 3

What is the general lighting load for a 3,000 sq. ft. Dwelling Unit?

Accepted Answer

NEC Table 220.12 lists Dwelling Units at 3.0 VA per sq. ft. 3,000 * 3 = 9,000 VA.

Question 4

For a single-family dwelling, the small-appliance branch circuit load is calculated at:

Accepted Answer

NEC 220.52(A) requires that for each 2-wire small-appliance branch circuit, a load of 1,500 VA shall be included.

Question 5

Calculate the feeder demand load for a 14 kW electric range.

Accepted Answer

Table 220.55 Col C for one range: 8 kW is for ranges up to 12 kW. For 14 kW (which is 2 kW over 12), increase 8 kW by 5% for each kW over 12. 2 kW over. 2 x 5% = 10%. 8 kW x 1.10 = 8.8 kW.

Question 6

A commercial building has 50 duplex receptacles. What is the calculated load before demand factors?

Accepted Answer

NEC 220.14(I) assigns 180 VA per receptacle strap. 50 * 180 = 9,000 VA.

Question 7

What is the calculated load for 50 linear feet of show window in a retail store?

Accepted Answer

NEC 220.14(G) requires show windows to be calculated at 200 VA per linear foot. 50 ft * 200 VA/ft = 10,000 VA.

Question 8

Calculate the feeder load for 40 feet of lighting track in a commercial showroom.

Accepted Answer

NEC 220.43(B) assigns a load of 150 VA for every 2 feet of track. 40 ft / 2 = 20 units. 20 * 150 VA = 3,000 VA.

Question 9

A restaurant kitchen has the following electric equipment: dishwasher, booster heater, oven, and fryer. What demand factor may be applied to the total load?

Accepted Answer

NEC Table 220.56 allows a demand factor of 80% for commercial kitchen equipment when there are 4 units.

Question 10

When calculating the Neutral Load for a household electric dryer, what percentage of the dryer load is permitted to be used?

Accepted Answer

NEC 220.61(B)(1) permits the neutral load for household electric ranges and dryers to be calculated at 70% of the load determined by Article 220.

Question 11

A building has a 10 kW heating load and a 15 kVA air conditioning load. The system prevents them from operating simultaneously. Which load is used in the feeder calculation?

Accepted Answer

NEC 220.60 (Noncoincident Loads) states that where two loads are unlikely to be used simultaneously, only the larger of the two needs to be used. 15 kVA > 10 kW.

Question 12

In NEC 2026, the 'Standard Method' for calculating branch circuit, feeder, and service loads is primarily detailed in which article?

Accepted Answer

While Article 120 covers General Requirements, Article 220 remains the home for the specific Standard Method calculations for Branch Circuits and Feeders.

Question 13

What is the minimum load assignment for a required commercial sign outlet?

Accepted Answer

NEC 220.14(F) requires a sign outlet to be calculated at a minimum of 1,200 VA.

Question 14

Using the Standard Method, what is the feeder demand for two 12 kW household electric ranges?

Accepted Answer

NEC Table 220.55 Column C shows that the demand load for 2 ranges is 11 kW.

Question 15

Fixed electric space heating loads shall be calculated at ____ of the total connected load.

Accepted Answer

NEC 220.51 states that fixed electric space heating loads shall be calculated at 100% of the total connected load.

Question 16

For an office building with 200 duplex receptacles (standard 180VA each), totaling 36,000 VA, what is the demand load allowed by Table 220.44?

Accepted Answer

Table 220.44 allows the first 10 kVA to be calculated at 100%, and the remainder at 50%. 36,000 - 10,000 = 26,000. 26,000 * 0.5 = 13,000. 10,000 + 13,000 = 23,000 VA.

Question 17

In a dwelling unit, four separate fixed appliances (water heater, disposal, dishwasher, trash compactor) are on the same feeder. A demand factor of ____ may be applied.

Accepted Answer

NEC 220.53 allows a demand factor of 75% for four or more appliances fastened in place (excluding ranges, clothes dryers, space heating, and AC).

Question 18

What is the unit load per square foot for general lighting in a School?

Accepted Answer

Table 220.12 (NEC 2023) lists Schools at 3.0 VA/sq. ft.

Question 19

Using the Optional Method (220.82) for a dwelling unit, the first 10 kVA of the general load is calculated at 100%, and the remainder is calculated at:

Accepted Answer

NEC 220.82(B) Optional Calculation: First 10 kVA at 100%, remainder at 40%.

Question 20

According to NEC 2026, Article 120.4(A) allows the load calculation to be reduced when which of the following is installed?

Accepted Answer

NEC 2026 Article 120.4(A) (formerly in 220) explicitly allows Energy Management Systems to control the maximum load, permitting the calculation to be based on the setpoint of the EMS.

Question 21

Heavy-duty lampholders shall be calculated at a minimum of _____ per lampholder.

Accepted Answer

NEC 220.14(E) assigns a unit load of 600 VA for heavy-duty lampholders.

Question 22

For a Farm Service, the load for the largest motor is calculated at:

Accepted Answer

NEC 220.103 (Farm Loads) requires the largest motor to be calculated at 125% of its full-load current rating, similar to standard motor feeders.

Question 23

A hotel has 100 guest rooms. The general lighting demand factor for the first 20,000 VA is 50%. What is the demand factor for the next 80,000 VA?

Accepted Answer

NEC Table 220.42 (Hotels/Motels): First 20,000 VA @ 50%, Next 80,000 VA @ 40%, Remainder @ 30%.

Question 24

Under NEC 2026, where would you find the requirements for calculating the load of Electric Vehicle Supply Equipment (EVSE)?

Accepted Answer

The specific calculation for EVSE loads is located in Article 220 (Branch Circuits/Feeders), specifically 220.57 (New/Revised), though Article 625 contains the equipment rules. 220.57 requires 100% of the rating.

Question 25

What is the feeder demand load for a 5 kW household electric clothes dryer?

Accepted Answer

NEC 220.54 requires a minimum of 5,000 VA or the nameplate rating, whichever is larger. Since the dryer is 5 kW (5,000 VA), the load is 5,000 VA.

Question 26

Calculate the service load for a Marina with 20 boat slips.

Accepted Answer

NEC Table 555.12 provides demand factors for marinas. For 15-30 slips, the demand factor is 60%.

Question 27

For a multifamily dwelling, the house loads (hallway lighting, outdoor lighting, etc.) are calculated based on:

Accepted Answer

Common area loads in multifamily dwellings (corridors, lobbies, etc.) are calculated using the commercial lighting rules (Table 220.12) and cannot be included in the dwelling unit demand factors.

Question 28

Using the Optional Method (220.82), a heat pump without supplemental heat is calculated at _____ of the nameplate rating.

Accepted Answer

NEC 220.82(C)(2) requires heat pumps without supplemental electric heat to be calculated at 100% of the nameplate rating.

Question 29

Calculate the supply conductor ampacity for a resistance welder with a 50% duty cycle and a primary current of 60A.

Accepted Answer

NEC 630.31(A)(2) states the multiplier for a 50% duty cycle is 0.71. 60A * 0.71 = 42.6A (approx 42-43A).

Question 30

In an office building, what demand factor can be applied to receptacle loads in excess of 10 kVA?

Accepted Answer

NEC Table 220.44 allows a demand factor of 50% for receptacle loads over 10 kVA in other than dwelling units.

Question 31

A 3-phase, 4-wire feeder supplies a non-linear load (harmonics present). How must the neutral conductor be sized?

Accepted Answer

NEC 220.61(C) prohibits the reduction of the neutral capacity for that portion of the load that consists of nonlinear loads (which produce harmonic currents that add in the neutral).

Question 32

Under NEC 2026, Article 120.2 includes definitions specifically applicable to load calculations. Which term is newly defined or clarified here for calculation purposes?

Accepted Answer

NEC 2026 explicitly defines the method for determining 'Floor Area' in Article 120, standardizing how measurements are taken (outside dimensions, excluding garages/open porches).

Question 33

Track lighting in a single-family dwelling is calculated at:

Accepted Answer

NEC 220.43(B) Exception states that track lighting in dwelling units is not calculated separately; it is considered covered by the 3 VA/sq. ft. general lighting load.

Question 34

What is the maximum number of duplex receptacles allowed on a 20A, 120V branch circuit in a commercial office building (assuming continuous load is not a factor)?

Accepted Answer

Commercial receptacles are calculated at 180 VA each. Circuit capacity = 120V * 20A = 2400 VA. 2400 / 180 = 13.33. Max is 13 receptacles.

Question 35

A dwelling unit has a dishwasher (1200 VA), disposal (900 VA), and trash compactor (1000 VA). Can the 75% demand factor be applied to these appliances?

Accepted Answer

NEC 220.53 requires FOUR or more appliances fastened in place to apply the 75% demand factor. There are only three here.

Question 36

When sizing a service for a building with 100A of non-continuous load and 50A of continuous load, the minimum service rating must be at least:

Accepted Answer

NEC 215.2(A)(1) / 230.42 require service conductors to be sized at 100% of non-continuous load + 125% of continuous load. 100 + (50 * 1.25) = 100 + 62.5 = 162.5 Amps.

Question 37

What is the general lighting load per square foot for a Warehouse?

Accepted Answer

Table 220.12 (2023) lists 'Warehouse (storage)' at 0.25 VA (or 0.5 depending on specific adoption cycle updates, but generally storage is very low). NOTE: 2020/2023 Table 220.12 updated 'Storage spaces' to 0.25 VA/sq ft (previously higher).

Question 38

For a Recreational Vehicle (RV) Park, what is the demand factor for a service supplying 15 sites?

Accepted Answer

NEC Table 551.73(A) gives the demand factor for 13-15 RV sites as 45%.

Question 39

Mobile home park services are calculated based on the number of mobile homes. For a park with 25 mobile homes, what is the demand factor?

Accepted Answer

NEC Table 550.31: For 25 mobile homes, the demand factor is 24%.

Question 40

Calculate the demand load for one 10 kW range and one 16 kW range in a dwelling unit.

Accepted Answer

Per NEC Table 220.55 Note 2, for ranges of unequal ratings, calculate based on the average rating. Average = (10 + 16) / 2 = 13 kW. Column C demand for 2 appliances is 11 kW. Since 13 kW exceeds 12 kW by 1 kW, increase the 11 kW demand by 5% per kW over 12. 11 kW x 1.05 = 11.55 kW.

Question 41

Calculate the demand load for a single household electric range rated at 16 kW.

Accepted Answer

NEC Table 220.55 Note 1: For ranges over 12 kW, increase the 8 kW demand by 5% for each kW over 12. 16 - 12 = 4 kW excess. 4 * 5% = 20%. 8 kW * 1.20 = 9.6 kW.

Question 42

When calculating the feeder for a 3-phase, 480V system with a total load of 100 kVA, what is the current in Amperes?

Accepted Answer

Amps = VA / (Volts * 1.732). 100,000 / (480 * 1.732) = 100,000 / 831.4 = 120.2 Amps.

Question 43

Recessed lighting fixtures for a commercial building must be calculated based on:

Accepted Answer

NEC 220.14(D) requires the load to be calculated based on the maximum volt-ampere rating of the equipment and lamps for which the luminaire is rated.

Question 44

What is the minimum service rating for a single-family dwelling with six or more 2-wire branch circuits?

Accepted Answer

NEC 230.79(C) requires a minimum 100-ampere rating for a single-family dwelling service.

Question 45

When adding loads to an existing service, NEC 220.87 permits the calculation to be based on the maximum demand data for a 1-year period. If such data is not available, a ____ period can be used.

Accepted Answer

NEC 220.87 Exception allows a 30-day period of recording demand data if 1-year data is not available.

Question 46

In NEC 2026, Article 625 (EVs) mandates that Energy Management Systems (EMS) used to control EV loads must be:

Accepted Answer

A key safety enforcement in 2026 is that EMS controlling EV loads (to reduce service calculations) must be Listed equipment to ensure reliability.

Question 47

What is the minimum feeder load for a 120V circuit supplying a continuous lighting load of 16A?

Accepted Answer

Continuous loads are calculated at 125%. 16A * 1.25 = 20 Amps.

Question 48

For a multifamily dwelling using the Standard Method, a demand factor of 75% may be applied to:

Accepted Answer

NEC 220.53 permits a demand factor of 75% for four or more appliances fastened in place (other than ranges, dryers, space heating, and AC) served by the same feeder.

Question 49

Calculate the feeder neutral load for a household electric range rated 14 kW.

Accepted Answer

Step 1: Feeder demand (hot) for 14 kW range = 8.8 kW (Table 220.55 Col C). Step 2: Neutral demand is 70% of feeder demand. 8.8 kW * 0.70 = 6.16 kW.

Question 50

A commercial kitchen has three pieces of thermostatic electric cooking equipment. What demand factor is applied?

Accepted Answer

NEC Table 220.56: For 3 units of kitchen equipment, the demand factor is 90%.

Question 51

In the Optional Method for multifamily dwellings (220.84), the house loads must be calculated using:

Accepted Answer

NEC 220.84(A)(3) requires that house loads (common areas) be calculated in accordance with Part III of Article 220 (Standard Method) and added to the dwelling unit loads.

Question 52

Using the Optional Method (220.82) for a single dwelling, how is the air conditioning load calculated?

Accepted Answer

NEC 220.82(C)(1) requires air conditioning to be calculated at 100% of the nameplate rating.

Question 53

What is the minimum unit load for a heavy-duty lampholder used in a calculation?

Accepted Answer

NEC 220.14(E) sets the minimum load for heavy-duty lampholders at 600 volt-amperes.

Question 54

When calculating the load for a hospital, the general lighting load is:

Accepted Answer

NEC Table 220.12 (2023) lists 'Hospital' at 1.6 VA per square foot.

Question 55

A feeder supplies 5 household dryers. What is the demand factor?

Accepted Answer

NEC Table 220.54: For 5 dryers, the demand factor is 85%.

Question 56

The load for a recessed luminaire is based on:

Accepted Answer

NEC 220.14(D) requires the calculation to be based on the maximum VA rating of the equipment and lamps for which the luminaire is rated.

Question 57

Calculate the amperage for a 3-phase, 208V load of 50 kVA.

Accepted Answer

I = VA / (V * 1.732). 50,000 / (208 * 1.732) = 50,000 / 360.25 = 138.8 Amps (Round to 139).

Question 58

For a service upgrade where 1-year demand data is used (220.87), the new load is added to the maximum demand at ____ of the new load's rating.

Accepted Answer

NEC 220.87(2) requires the new load to be added at 125% of the continuous load plus the noncontinuous load (or essentially calculated per code rules, often 125% if continuous). However, the text says 'The new load... shall be added'. It implies adding the calculated load. Standard calculation rules apply (125% continuous).

Question 59

Calculate the general lighting load for a 12,000 sq. ft. Office Building.

Accepted Answer

NEC Table 220.12 (2023) lists Office at 1.3 VA/sq ft. 12,000 * 1.3 = 15,600 VA.

Question 60

A motor-generator arc welder has a duty cycle of 60%. What is the multiplier for the supply conductors?

Accepted Answer

NEC Table 630.11(A): For a motor-generator welder with a 60% duty cycle, the multiplier is 0.78.

Question 61

Which of the following loads is considered a Continuous Load?

Accepted Answer

NEC 100 defines Continuous Load as max current for 3 hours or more. Commercial lighting is generally considered continuous. Household appliances are intermittent.

Question 62

When using the Optional Method for a new restaurant (220.88), if the total connected load is 300 kVA, the first 200 kVA is calculated at 80% and the remainder at:

Accepted Answer

NEC 220.88 (New Restaurants) Table: First 200 kVA @ 80%, Remainder @ 50%.

Question 63

NEC 2026 Article 220.53 (Appliance Demand Factors) was revised. Which appliance is now explicitly EXCLUDED from the 75% demand factor group?

Accepted Answer

NEC 2026 clarifies that EVSE cannot be grouped with standard household appliances for the 75% demand factor; it has its own section (220.57).

Question 64

Under NEC 2026, Article 120.4(B) states that if a building is designed for future expansion, the calculated load:

Accepted Answer

NEC 2026 Art 120.4(B) explicitly permits (and in some design contexts requires consideration of) future expansion loads to be included in the calculation if specified.

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