NCCER 26401 LOAD CALCULATIONS-FEEDER AND SERVICES
NEWEST VERSION 2025/2026 ACTUAL QUESTION AND
CORRECT DETAILED VERIFIED ANSWERS FROM VERIFIED
SOURCES RATED A GRADE.
What is the conductor ampacity for the feeder with a continuous
load of 120 amps?
•120a cont. load x 1.25 = 150a –ANSWER.
To be considered a _____________load a circuit must operate
for at least ____ hours or more without interruption.
Continuous Load = 3 hours or more –ANSWER.
The smallest size locking and grounding type receptacle that
may be used to provide shore power for boats is ______ per
NEC 555.19(A)(4) informational note
30 amps –ANSWER.
The demand factor for 50 shore power receptacles is _________
per NEC Table 555.12
50% -ANSWER.
1.Calculate the combined General Lighting Load for a residence
that is 1,650 square feet (220.12) with 2 small appliance branch
circuits (220.52a) and one laundry circuit (220.52b).
2.Apply Demand factors from NEC Table 220.42 to the
calculation.
1,650sf x 3 va = 4,950va
,1500va x 2 = 3000va
1500va x 1 = 1500va
•4950+3000+1500 = 9,450
Apply Demand Factors:
1st 3000 @ 100% = 3000va
Remaining 6450va @ 35% = 2,257.5va
3000va + 2,258 = 5258va –ANSWER.
Using the VA/linear foot method, the total VA (include cont. load)
that must be used in a service calculation for a 50' show window
is _____.
50ft x 200va = 10,00va x 125% = 12,500va –ANSWER.
What is the load for 40 non-dwelling unit receptacles? (Assume
that the load is not continuous.)
7200va –ANSWER.
Use of the 25' tap rule is limited to installation in high-bay
manufacturing buildings with wall heights over _____.
NEC 240.21 (B)(4) 35ft –ANSWER.
A farm has three buildings with loads of 82A, 65A and 15A. What
is the total load? Assume that there are no dwellings or motors.
Answer 117 amps
Bldg 1: 82 amps @100 = 82 amps Bldg 2: First 60 amps @ 50% =
30 amps Bldg 2: Remaining 5 amps @ 25% = 1.25 amps Bldg 3:
15 amps @ 25% = 3.75 amps Total: 82+30+1.25+3.75 = 117 amps
total Load calculated at 2 circuit 1500VA.
Small Appliance Ciruit
, Voltage drop formula 1
VD = (2LR*I)/1,000
VD = voltage drop (in volts)
L = load center or total length in feet
R = conductor resistance per NEC Chapter 9, Table 8
I = current
The number 1,000 represents 1,000' or less of conductor.
Show window loads should be calculated at _____ per linear foot
of show window.
200VA –ANSWER.
What is the minimum general lighting load, in VA per square
foot, required by the NEC for a store?
3
2-1/2
5
2
3 –ANSWER.
The load for a branch circuit installed for the supply of
exterior signs or outline lighting must be computed at a
minimum of _____. NEC Section 220.14(F) requires a
minimum of 1,200VA. –ANSWER.
What is the minimum general lighting load, in VA per square
foot, required by the NEC for an office building?
3-1/2
NEWEST VERSION 2025/2026 ACTUAL QUESTION AND
CORRECT DETAILED VERIFIED ANSWERS FROM VERIFIED
SOURCES RATED A GRADE.
What is the conductor ampacity for the feeder with a continuous
load of 120 amps?
•120a cont. load x 1.25 = 150a –ANSWER.
To be considered a _____________load a circuit must operate
for at least ____ hours or more without interruption.
Continuous Load = 3 hours or more –ANSWER.
The smallest size locking and grounding type receptacle that
may be used to provide shore power for boats is ______ per
NEC 555.19(A)(4) informational note
30 amps –ANSWER.
The demand factor for 50 shore power receptacles is _________
per NEC Table 555.12
50% -ANSWER.
1.Calculate the combined General Lighting Load for a residence
that is 1,650 square feet (220.12) with 2 small appliance branch
circuits (220.52a) and one laundry circuit (220.52b).
2.Apply Demand factors from NEC Table 220.42 to the
calculation.
1,650sf x 3 va = 4,950va
,1500va x 2 = 3000va
1500va x 1 = 1500va
•4950+3000+1500 = 9,450
Apply Demand Factors:
1st 3000 @ 100% = 3000va
Remaining 6450va @ 35% = 2,257.5va
3000va + 2,258 = 5258va –ANSWER.
Using the VA/linear foot method, the total VA (include cont. load)
that must be used in a service calculation for a 50' show window
is _____.
50ft x 200va = 10,00va x 125% = 12,500va –ANSWER.
What is the load for 40 non-dwelling unit receptacles? (Assume
that the load is not continuous.)
7200va –ANSWER.
Use of the 25' tap rule is limited to installation in high-bay
manufacturing buildings with wall heights over _____.
NEC 240.21 (B)(4) 35ft –ANSWER.
A farm has three buildings with loads of 82A, 65A and 15A. What
is the total load? Assume that there are no dwellings or motors.
Answer 117 amps
Bldg 1: 82 amps @100 = 82 amps Bldg 2: First 60 amps @ 50% =
30 amps Bldg 2: Remaining 5 amps @ 25% = 1.25 amps Bldg 3:
15 amps @ 25% = 3.75 amps Total: 82+30+1.25+3.75 = 117 amps
total Load calculated at 2 circuit 1500VA.
Small Appliance Ciruit
, Voltage drop formula 1
VD = (2LR*I)/1,000
VD = voltage drop (in volts)
L = load center or total length in feet
R = conductor resistance per NEC Chapter 9, Table 8
I = current
The number 1,000 represents 1,000' or less of conductor.
Show window loads should be calculated at _____ per linear foot
of show window.
200VA –ANSWER.
What is the minimum general lighting load, in VA per square
foot, required by the NEC for a store?
3
2-1/2
5
2
3 –ANSWER.
The load for a branch circuit installed for the supply of
exterior signs or outline lighting must be computed at a
minimum of _____. NEC Section 220.14(F) requires a
minimum of 1,200VA. –ANSWER.
What is the minimum general lighting load, in VA per square
foot, required by the NEC for an office building?
3-1/2
