K
C
LOAD CALCULATIONS -
LO
BRANCH AND FEEDER
CIRCUITS (CHAPTER 1)
YC
EXAM QUESTIONS WITH
D
CORRECT ANSWERS ALL
U
VERIFIED BY AN EXPERT A+
ST
GRADED (LATEST UPDATE)
, Ampacity - ANS The maximum current in amperes that a conductor can carry continuously
under the conditions of use without exceeding its temperature rating
Branch circuit - ANS circuit conductors between the final overcurrent device protecting the
circuit and the outlet(s)
continuous load - ANS load where the maximum current is expected to continue for three
hours or more
device - ANS unit of an electrical system, other than a conductor, that carries or controls
K
electric energy as its principal function
individual branch circuit - ANS branch circuit that supplies only one piece of utilization
C
equipment
outlet - ANS point on the wiring system at which current is taken to supply utilization
LO
equipment
overcurrent - ANS any current in excess of the rated current of equipment or the ampacity of a
conductor. it may result from overload, short circuit, or ground fault.
YC
receptacle - ANS contact device installed at an outlet for connection as a single contact
device. a single receptacle is a single contact device with no other contact device on the same
yoke. a multiple receptacle is a single device containing two (duplex) or more receptacles.
receptacle outlet - ANS outlet where one or more receptacles are installed.
D
utilization equipment - ANS equipment that utilizes electric energy for electronic, chemical,
heating, lighting, electromechanical, or similar purposes.
U
what is the maximum continuous load that may be connected to a 20A, 120V fuse? - ANS 20A
x 80% or .80 = 16A (continuous loads are calculated at 125% of the maximum current rating of
the load. the reciprocal of 125% is equivalent to 80%)
ST
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....... - ANS 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..... - ANS 800VA / 120V = 6.67A
Appliance - ANS 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
C
LOAD CALCULATIONS -
LO
BRANCH AND FEEDER
CIRCUITS (CHAPTER 1)
YC
EXAM QUESTIONS WITH
D
CORRECT ANSWERS ALL
U
VERIFIED BY AN EXPERT A+
ST
GRADED (LATEST UPDATE)
, Ampacity - ANS The maximum current in amperes that a conductor can carry continuously
under the conditions of use without exceeding its temperature rating
Branch circuit - ANS circuit conductors between the final overcurrent device protecting the
circuit and the outlet(s)
continuous load - ANS load where the maximum current is expected to continue for three
hours or more
device - ANS unit of an electrical system, other than a conductor, that carries or controls
K
electric energy as its principal function
individual branch circuit - ANS branch circuit that supplies only one piece of utilization
C
equipment
outlet - ANS point on the wiring system at which current is taken to supply utilization
LO
equipment
overcurrent - ANS any current in excess of the rated current of equipment or the ampacity of a
conductor. it may result from overload, short circuit, or ground fault.
YC
receptacle - ANS contact device installed at an outlet for connection as a single contact
device. a single receptacle is a single contact device with no other contact device on the same
yoke. a multiple receptacle is a single device containing two (duplex) or more receptacles.
receptacle outlet - ANS outlet where one or more receptacles are installed.
D
utilization equipment - ANS equipment that utilizes electric energy for electronic, chemical,
heating, lighting, electromechanical, or similar purposes.
U
what is the maximum continuous load that may be connected to a 20A, 120V fuse? - ANS 20A
x 80% or .80 = 16A (continuous loads are calculated at 125% of the maximum current rating of
the load. the reciprocal of 125% is equivalent to 80%)
ST
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....... - ANS 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..... - ANS 800VA / 120V = 6.67A
Appliance - ANS 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
