Branch Circuit Requirement Flashcards
A building electrical systems consists of several circuits that
extend out from the ______ or ______.
switchboard or panel board
A _________ is that portion of the building wiring system that
extends beyond the final over current protection device that
is protecting the circuit.
branch circuit
________ is a point in a wiring system where current is taken to supply an appliance, piece of equipment, or
lighting installation.
outlet
Is composed of an overcurrent
protection device (fuse or circuit breaker), wiring , and one or more outlets.
branch circuit
These circuits usually lead
directly from the distribution panel to the
appliance and do not serve any other
electrical devices.
Individual Branch Circuit
is sometimes known in the trade as a
dedicated or special purpose circuit.
Individual Branch Circuit
A branch circuit that serves one receptacle or piece of equipment such as for a range, clothes dryer, large copy machine, or other
piece of machinery.
Individual Branch Circuit
A type of branch circuit that supplies two or more outlets for
lighting and appliances.
General Purpose Branch Circuit
This type of circuit may
be reffered to as a lighting circuit; this is a
carryover from the days when electricity was
first used in buildings and its predominant
purpose was lighting.
General Purpose Branch Circuit
This is the type of branch circuit that supplies
energy to one or more outlets to which
appliances are to be connected.
Appliance Branch Circuit
Appliance branch do not
supply ________.
lighting fixtures
Appliance branch circuits
cannot exceed _________
20 A
A branch circuit consisting of two or more
undergrounded (hot) conductor having a
volatge between them and a common neutral (grounded) conductor that is shared between the ungrounded conductors such as in a
120/240 V three-wire circuit.
Multiwire Branch Circuit
An emergency system of feeders and branch circuit that provides adequate power to patients
and personnel.
Life Safety Branch Circuit
_________
are fed with a 120/240 V circuit
having two ungrounded (hot)
conductors, a grounded neutral
conductor, and a grounding
conductor.
Split wired duplex receptacles
An emergency system of feeders and
circuits intended to provide power to task
illumination, special power circuits, and selected receptacles serving areas and functions related to
patient care.
Critical Branch Circuit
_______ allows power to be drawn
from two separate circuits on one duplex
receptacle.
split wiring
The _________is
determined by the rating of the over
current protection device (fuse or
circuit breaker) used to protect the
wiring in the circuit from excessive
current flow.
branch circuit rating
Design of a _______
involves sizing conductors and
over current protection (fuse
or circuit breaker) that match
the circuit rating.
branch circuit
all electromechanical
(having a motor) appliances or pieces
of equipment generally will have a
VA rating lower than the power (P)
rating. T or F
false (Larger than)
When a general purpose circuit feeds fixed appliances and
luminaires or portable appliances, the total of the fixed
appliances should be no more than __% of the branch circuit
rating.
50%
All electric-resistant appliance or
pieces of equipment such as an oven,
water-heater and space-heater (no
blower) and lights generally have
power (wattage) ratings equal to their
connected loading (VA rating). T or F
true
General purpose circuits feed more than one outlet
for lighting or other purpose. T or F
true
When portable appliances will be used on a general purpose
a circuit, the limit for any one portable appliance is __% of the
branch circuit rating.
80%
In commercial applications, convenience receptacles are computed at a load of 1.5 A (180 VA) per receptacle and are limited to __% of the rating.
80%
These circuits provide power to a single outlet such
as a receptacle serving a range, clothes dryer, or copy
machine.
Individual Circuits
Although there are no size limitations for an
individual circuit rating, appliances and equipment rated at
above 25 A must be placed on a separate individual circuit
because of the __% maximum single load limitation in general
purpose circuiting.
50%
These circuits serve two or more outlets to which
only appliances are connected.
Appliance Circuits
A ____________ is a connected load
that operates for 3 hr or more at any
time.
continuous load
connected load on a _ continuous-load
circuit should not exceed __% of the
individual circuit rating.
80%
On a branch circuit, conductor size is tied to ________ rating.
circuit rating.
Switches must be selected to match the load they control. T or F
T
A panel board-like enclosure called lighting control panel is used
in small lighting installations that require less switches. T or F
F (LARGE lighting installations that require MANY switches).
Receptacles must be selected to match the appliance or equipment they serve. T or F
T
ordinary convenience receptacles and switches
are general wall mounted and there are no
specific height requirements for switches and
receptacles. T or F
T
unless a receptacle is controlled by a switch, the receptacle is frequently aligned
with the grounding slot downward.T or F
F (upward)
An ____________,
serves to limit current levels in a
conductor by interrupting power
when current limitations are
exceeded.
Overcurrent protection (OCP)
device
The voltage rating of a
fuse or circuit breaker
must be equal to or
greater than the voltage
of the circuit in which the
fuse is applied. T or F
T
The current carried
(amperage) by the electrical
circuit or system protected
by an OCP device must not
exceed the maximum current
rating of the circuit breaker. T or F
T
Furthermore, the amperes
interruption current (AIC)
rating for circuit breakers
should be at least _______ A
and ________ A for fuses.
5000A and 10000A
The OCP device
must protect the
grounded
conductors in a
circuit to ensure
that power to the
circuit Is
interrupted by the
OCP device. T or F
F (ugrounded)
The fuse or circuit breaker
must be installed at a
location in the circuit
where the conductors
receive power. T or F
T
the neutral
(grounded) and
grounding
conductors are
protected by
overcurrent
protection. T or F
F (are not protected)
is a set of conductors that carry a comaparatively large amount of power from the service equipment to a second panelboard, called a subpanelboard where branch circuit further distribute the power.
Feeder
Feeders should be capable of carrying the amount of current
required by the load, plus any current that may be required in the future. T or F
T
Feeder must be designed to provide sufficient power to the branch circuits they supply so feeder conductor size is based on the minimum load to be supplied by the feeder. T or F
F ( maximum)
_____ and ________ can
be used as
distribution
equipment, ata
point downstream
from the service
entrance
equipment.
switchboards and panelboards
the required clearance of service equipment found in code is typically minimum vertical clearancs of __ft above roadways , __ft above driveways and__ ft above sidewalds .
18ft above roadways , 12ft above driveways and 10 ft above sidewalds .
Primary and secondary conductors are sized to carry
50% of the ampere rating of the overcurrent protection. T or F
F (100%)
All tamper-resistant receptacles must have
either the words “tamper resistant” or the
letters “TR” (minimum 3/16 in or 5 mm
high) on the device as a clear indication that
this is a tamper-resistant receptacle. T or F
T
Ground Fault Circuit Protection requirements apply to equipment rated at 240
V (e.g. baseboard heater, room air conditioners, welding
receptacles, or other outlets that are not rated at 125 V). T or F
F ( do not apply)
For homes protected by fuses, the convenience receptacle or portable-type GFCI protection is not recommended. T or F
F ( highly recommended )
