ELECTRICAL LEVEL 3 MODULE 1 LOAD
CALCULATIONS AND BRANCH FEEDER
CIRCUITS FINAL STUDY SHEET 2026
QUESTIONS WITH COMPLETE ANSWERS
GRADED A+
◉ The voltage drop for a 208V, 1 ott circuit with a load of 28A, using
No. 8 stranded copper conductors at the circuit length of 160' is........
Answer: VD (Voltage Drop) = (2xLxRxI) / 1000, L- load center or
total length in feet, R- conductor resistance (NEC chapter 9, table 8),
I- current. (2x160ftx.776x80A)/1000 = 6.97V
◉ The ampacity of a 120V, 1 ott load rated at 800VA is...... Answer:
800VA / 120V = 6.67A
◉ Appliance. Answer: utilization equipment, generally other than
industrial, normally built in standardized sizes or types, that is
installed or connected as a unit to perform one or more functions
such as clothes washing, air conditioning, food mixing, deep frying,
or other purposes
◉ Appliance branch circuits. Answer: Branch circuits supplying
energy to one or more outlets to which appliances are to be
, connected. such circuits are to have no permanently connected
lighting fixtures that are not part of an appliance
◉ Demand factors. Answer: ratio of the maximum demands of a
system, or part of a system, to the total connected load of a system or
the part of the system under consideration
◉ General-purpose branch circuit. Answer: Branch circuits that
supply two or more receptacles or outlets for lighting and appliances
◉ what is the calculated load, in amps, for a 120V circuit supplying 8
recessed fluorescent fixtures operating continuously? (Each
fluorescent ballast is rated at 0.5A.). Answer: 8 fixtures x 0.5A = 4A,
125% of 4A, 4Ax 1.25 = 5A
◉ What is the maximum number of continuous duty duplex
receptacles that can be connected to 20A, 120V circuit in a
commercial building?. Answer: total circuit capacity = 20A x 120V =
2400VA, rating per receptacle = 180VA x 125% = 225VA, total loads
that may be connected = (circuit capacity)/(rating per receptacle) =
2400VA/225VA = 10.7 (round down) = 10 receptacles
◉ What is the total load, in VA, for 4 small appliance branch circuits
in a single-family dwelling?. Answer: 4 small appliances = 4 circuits,
4 circuits x 1500VA = 6000VA
CALCULATIONS AND BRANCH FEEDER
CIRCUITS FINAL STUDY SHEET 2026
QUESTIONS WITH COMPLETE ANSWERS
GRADED A+
◉ The voltage drop for a 208V, 1 ott circuit with a load of 28A, using
No. 8 stranded copper conductors at the circuit length of 160' is........
Answer: VD (Voltage Drop) = (2xLxRxI) / 1000, L- load center or
total length in feet, R- conductor resistance (NEC chapter 9, table 8),
I- current. (2x160ftx.776x80A)/1000 = 6.97V
◉ The ampacity of a 120V, 1 ott load rated at 800VA is...... Answer:
800VA / 120V = 6.67A
◉ Appliance. Answer: utilization equipment, generally other than
industrial, normally built in standardized sizes or types, that is
installed or connected as a unit to perform one or more functions
such as clothes washing, air conditioning, food mixing, deep frying,
or other purposes
◉ Appliance branch circuits. Answer: Branch circuits supplying
energy to one or more outlets to which appliances are to be
, connected. such circuits are to have no permanently connected
lighting fixtures that are not part of an appliance
◉ Demand factors. Answer: ratio of the maximum demands of a
system, or part of a system, to the total connected load of a system or
the part of the system under consideration
◉ General-purpose branch circuit. Answer: Branch circuits that
supply two or more receptacles or outlets for lighting and appliances
◉ what is the calculated load, in amps, for a 120V circuit supplying 8
recessed fluorescent fixtures operating continuously? (Each
fluorescent ballast is rated at 0.5A.). Answer: 8 fixtures x 0.5A = 4A,
125% of 4A, 4Ax 1.25 = 5A
◉ What is the maximum number of continuous duty duplex
receptacles that can be connected to 20A, 120V circuit in a
commercial building?. Answer: total circuit capacity = 20A x 120V =
2400VA, rating per receptacle = 180VA x 125% = 225VA, total loads
that may be connected = (circuit capacity)/(rating per receptacle) =
2400VA/225VA = 10.7 (round down) = 10 receptacles
◉ What is the total load, in VA, for 4 small appliance branch circuits
in a single-family dwelling?. Answer: 4 small appliances = 4 circuits,
4 circuits x 1500VA = 6000VA
