NCCER 26401 LOAD CALCULATIONS-FEEDER
AND SERVICES NEWEST VERSION 2025/2026
ACTUAL QUESTION AND CORRECT DETAILED
VERIFIED ANSWERS FROM VERIFIED SOURCES
RATED A GRADE.
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Terms in this set (113)
What is the minimum NEC 220.43 (A) Show windows 30ft x 200va = 6000 va
demand required for the
portion of a feeder that
supplies 30ft of show
window?
Residential Small apliance 1500 va
circuits must be rated at
__________ per NEC 220.52(A)
When performing load 60 amps
calculations for farm
buildings the load that
must be included in the
calculation at 100%
demand must be at least
_______ .
The demand lighting load 220. 14(M) 1.7 volt amperes per square foot. 18,000 va
for a 20,000 square foot
motel with no dining room
or ballroom is ____ per NEC
220.12 and 220.42
,What is the demand 72,000 va
lighting load for a 100,000
square foot hotel with no
dining room or ballroom is
____ per 220.12 and 220.42 ?
When calculating the Determine the sum of all the motor loads plus 25% of
feeder load for a motor the largest motor.
Control Center supplying
several Motors per 430.24
you must ______ .
A commercial kitchen with 65% demand factor
six or more pieces of
kitchen equipment is
subject to a demand
factor of ___________ per NEC
table 220.56.
When the overcurrent protection for a conductor is
What is a tap conductor? located on the load side rather than the supply side
of a conductor, it is considered to be a tap conductor
What is the minimum 3va per s.f.
general lighting load in
volt-amps per square foot
required by the NEC table
220.12 for a store?
•120a x 50ft = 6000
What is the total load
•110a x 60ft = 6600
center length for a tapped
•75a x 90ft = 6750
feeder with loads of 120a
•70a x 150ft = 10,500
at 50 feet, 110a at 60 feet,
•6000+6600+6750+10,500 = 29,850
75a and 90 feet, and 70
•120a+110a+75a+70a = 375a
amps at 150 feet?
•29,a = 79.6 ft load center length
, The minimum ampacity for •Table 555.12
a feeder supplying ten •9-14 receptacles @ 80%
30a shore power •10 receptacles x 30a = 300a
receptacles in a marina is •Apply the demand factor from 555.12 300a x 80% =
_____ per NEC table 555.12 240a
The minimum ampacity for •Table 555.12
a feeder supplying (30) •15-30 receptacles @ 70%
shore power receptacles •30 receptacles x 30a = 900a
in a marina each rated at •Apply the demand factor from 555.12 900a x 70% =
30a is _____ per NEC table 630a
555.12.
•What is the total load for •Use Table 430.250
a feeder serving •7.5 amps x 4 = 30a
•(4) 2 horsepower motors •16.7amps x 3 = 50.1a
7.5a • 46.2 amps x 1= 46.2a
•(3) 5 horsepower • 74.8 amps x 100% = 74.8
Motors16.7a •74.8a x .25% = 18.7a (add
•(1) 15 horsepower 46.2a additional 25% for largest motor
motor load)
•(1) 25 horsepower motor •30+50.1+46.2+74.8+18.7=219.8a or
? 74.8a 30+50.1+46.2+93.5 = 219.8a
•(all Motors are 208 volts)
What is the feeder •84,563 va / 208volts = 406.5522
ampacity for a three •Don’t forget it’s three phase! = 1.732
phase, 120/208 Volt •406..732 = 234.89a
subpanel with a
connected load of 84,563
Volt amps?
Using the Volt amps per •200va x 50ft = 10,000va
linear foot method, the •“Total” means include Continuous load
total Volt amps that must • 10,000va x 1.25 = 12,500va
be used in a service
calculation for a 50 foot
show window is ____ per
NEC 220.43(A).
AND SERVICES NEWEST VERSION 2025/2026
ACTUAL QUESTION AND CORRECT DETAILED
VERIFIED ANSWERS FROM VERIFIED SOURCES
RATED A GRADE.
Save
Terms in this set (113)
What is the minimum NEC 220.43 (A) Show windows 30ft x 200va = 6000 va
demand required for the
portion of a feeder that
supplies 30ft of show
window?
Residential Small apliance 1500 va
circuits must be rated at
__________ per NEC 220.52(A)
When performing load 60 amps
calculations for farm
buildings the load that
must be included in the
calculation at 100%
demand must be at least
_______ .
The demand lighting load 220. 14(M) 1.7 volt amperes per square foot. 18,000 va
for a 20,000 square foot
motel with no dining room
or ballroom is ____ per NEC
220.12 and 220.42
,What is the demand 72,000 va
lighting load for a 100,000
square foot hotel with no
dining room or ballroom is
____ per 220.12 and 220.42 ?
When calculating the Determine the sum of all the motor loads plus 25% of
feeder load for a motor the largest motor.
Control Center supplying
several Motors per 430.24
you must ______ .
A commercial kitchen with 65% demand factor
six or more pieces of
kitchen equipment is
subject to a demand
factor of ___________ per NEC
table 220.56.
When the overcurrent protection for a conductor is
What is a tap conductor? located on the load side rather than the supply side
of a conductor, it is considered to be a tap conductor
What is the minimum 3va per s.f.
general lighting load in
volt-amps per square foot
required by the NEC table
220.12 for a store?
•120a x 50ft = 6000
What is the total load
•110a x 60ft = 6600
center length for a tapped
•75a x 90ft = 6750
feeder with loads of 120a
•70a x 150ft = 10,500
at 50 feet, 110a at 60 feet,
•6000+6600+6750+10,500 = 29,850
75a and 90 feet, and 70
•120a+110a+75a+70a = 375a
amps at 150 feet?
•29,a = 79.6 ft load center length
, The minimum ampacity for •Table 555.12
a feeder supplying ten •9-14 receptacles @ 80%
30a shore power •10 receptacles x 30a = 300a
receptacles in a marina is •Apply the demand factor from 555.12 300a x 80% =
_____ per NEC table 555.12 240a
The minimum ampacity for •Table 555.12
a feeder supplying (30) •15-30 receptacles @ 70%
shore power receptacles •30 receptacles x 30a = 900a
in a marina each rated at •Apply the demand factor from 555.12 900a x 70% =
30a is _____ per NEC table 630a
555.12.
•What is the total load for •Use Table 430.250
a feeder serving •7.5 amps x 4 = 30a
•(4) 2 horsepower motors •16.7amps x 3 = 50.1a
7.5a • 46.2 amps x 1= 46.2a
•(3) 5 horsepower • 74.8 amps x 100% = 74.8
Motors16.7a •74.8a x .25% = 18.7a (add
•(1) 15 horsepower 46.2a additional 25% for largest motor
motor load)
•(1) 25 horsepower motor •30+50.1+46.2+74.8+18.7=219.8a or
? 74.8a 30+50.1+46.2+93.5 = 219.8a
•(all Motors are 208 volts)
What is the feeder •84,563 va / 208volts = 406.5522
ampacity for a three •Don’t forget it’s three phase! = 1.732
phase, 120/208 Volt •406..732 = 234.89a
subpanel with a
connected load of 84,563
Volt amps?
Using the Volt amps per •200va x 50ft = 10,000va
linear foot method, the •“Total” means include Continuous load
total Volt amps that must • 10,000va x 1.25 = 12,500va
be used in a service
calculation for a 50 foot
show window is ____ per
NEC 220.43(A).
