Nub – Bsce 2nd Term
Engineering
Utilities 1
Dela Cruz, Chalmer N.
civ201
Definition of Terms:
Ampacity.
Branch Circuit.
The current, in amperes, that a
conductor can carry
continuously under the conditions
of use without exceeding its
temperature rating.
Current carrying capacity
Appliance.
Utilization equipment, generally
other than industrial, that is
normally built in standardized
sizes or types and is installed or
connected as a unit to perform
one or more functions such as
clothes washing, air conditioning,
food mixing, deep frying, and so
forth.
Used in designing electrical plans
1 Hp = 746 Watts.
Approved.
Acceptable to the authority
having jurisdiction.
Plan must be approved by the
“Office Building Official”
Authority Having Jurisdiction
(AHJ).
The organization, office, or
individual responsible for
approving equipment, materials,
an installation, or a procedure.
(Sub-office of OBO)
The circuit conductors between
the final overcurrent device
protecting the circuit and the
outlet(s). (Sub-breakers)
Circuit Breaker.
A device designed to open and
close a circuit by non-automatic
means and to open the circuit
automatically on a
predetermined overcurrent
without damage to itself when
properly applied within its rating.
- Rating – current/ampere
- Protection (to avoid
overloading)
Concealed.
Rendered inaccessible by the
structure or finish of the building.
Wires in concealed raceways are
considered concealed, even
though they may become
accessible by withdrawing them.
Conductor, Bare.
A conductor having no covering
or electrical insulation
whatsoeverelectrical insulation.
Used as grounding system (ex.
High-rise buildings – foundations)
Conductor, Insulated.
Fitting.
A conductor encased within
material of composition and
thickness that is recognized by
this Code as electrical insulation.
Used in electrical wiring
An accessory such as a locknut,
bushing, or other part of a wiring
system that is intended primarily
to perform a mechanical rather
than an electrical function. (Ex.
Locknut used in switchbox)
Demand Factor.
Enclosure.
The ratio of the maximum
demand of a system, or part of a
system, to the total connected
load of a system or the part of
the system under consideration.
Electric Sign.
A fixed, stationary, or portable
self-contained, electrically
illuminated utilization equipment
with words or symbols designed
to convey information or attract
attention.
Energized.
Electrically connected to a
source of voltage.
Equipment.
A general term including
material, fittings, devices,
appliances, luminaires (fixtures),
apparatus, and the like used as a
part of, or in connection with, an
electrical installation. (Ex.
Automatic Transfer switch)
The case or housing of
apparatus, or the fence or walls
surrounding an installation to
prevent personnel from
accidentally contacting
energized parts or to protect the
equipment from physical
damage.
Ground-Fault Circuit Interrupter
(GFCI).
A device intended for the
protection of personnel that
functions to de-energize a circuit
or portion thereof within an
established period of time when
a Grounding Conductor.
A conductor used to connect
equipment or the grounded
circuit of a wiring system to a
grounding electrode or
electrodes.
Grounding Electrode.
A device that establishes an
electrical connection to the
earth.
Interrupting Rating.
Panelboard.
The highest current at rated
voltage that a device is intended
to interrupt under standard test
conditions.
Lighting Outlet.
An outlet intended for the direct
connection of a lamp holder, a
luminaire (lighting fixture), or a
pendant cord terminating in a
lamp holder.
Outlet.
A point on the wiring system at
which current is taken to supply
utilization equipment.
Overcurrent.
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.
Overload.
Operation of equipment in
excess of normal, full-load rating,
or of a conductor in excess of
rated ampacity that, when it
persists for a sufficient length of
time, would cause damage or
dangerous overheating. A fault,
such as a short circuit or ground
fault, is not an overload.
A single panel or group of panel
units designed for assembly in the
form of a single panel, including
buses and automatic overcurrent
devices, and equipped with or
without switches for the control of
light, heat, or power circuits;
designed to be placed in a
cabinet or cutout box placed in
or against a wall, partition, or
other support; and accessible
only from the front. (Ex. Buses/Bus
bar which is commonly
aluminum)
Power Outlet.
An enclosed assembly that may
include receptacles, circuit
breakers, fuse holders, fused
switches, buses, and watt-hour
meter mounting means; intended
to supply and control power to
mobile homes, recreational
vehicles, park trailers, or boats or
to serve as a means for
distributing power required to
operate mobile or temporarily
installed equipment.
Receptacle.
A receptacle is a contact device
installed at the outlet for the
connection of an attachment
plug. A single receptacle is a
single contact device with no
other contact device on the
same yoke. A multiple
receptacle is two or more
contact devices on the same
yoke.
other words, voltage is the
electromotive force.
Service Drop.
- is the standard unit used in.
measuring the strength of an
electric current, name after
Andre M. Ampere...
The overhead service conductors
from the last pole or other aerial
support to and including the
splices, if any, connecting to the
service-entrance conductors at
the building or other structure.
Switch, Transfer.
An automatic or non-automatic
device for transferring one or
more load conductor
connections from one power
source to another.
Ampere
Watt
- is the rate or measure of power
used or consumed. It represents
the equivalent heat volts and
ampere consumed by lights,
appliances or motors. A term
commonly labeled on light bulbs
or appliances, giving us an idea
of what kind of circuit would be
installed. The term is named after
James. Watt a Scottish inventor
Switchboard.
Resistance
A large single panel, frame, or
assembly of panels on which are
mounted on the face, back, or
both, switches, overcurrent and
other protective devices, buses,
and usually instruments.
Switchboards are generally
accessible from the rear as well
as from the front and are not
intended to be installed in
cabinets. (Ex. Cabinets consist of
controls of bus bars)
Volt or Voltage
-is the electrical pressure that
causes the electricity to move
through a conductor (wire). In
- is the friction or opposition to the
flow of current by the wires and
transformers, analogous to
plumbing installation, where the
flow of water is subjected to
resistance caused by friction
between the water and the
inside wall of the pipe, and the
various form of turns and fittings.
For direct current (DC.
electricity), the term Resistance is
used for friction, and impedance
for alternating current (AC
electricity).
Electric Current
- is the flow or rate of flow of
electric force in a conductor. A
current will only flow if a circuit is
formed comprising a complete
loop.
Electric Current is classified as:
1. Direct Current (DC)
2. Alternating Current (AC)
Direct Current
The DC electricity, flows in one
direction. The flow is said to be
·from negative to positive. The
normal source of a DC electricity,
is-the dry cell or storage battery.
Alternating Current
The AC electricity constantly
reverses- its direction of flow is
generated by machine called
generator. This type of current is
universally accepted because of
its unlimited number of
applications with the following
advantages:
1. It is easy to produce
2. It is cheaper to maintain
3. It could be transformed into
higher voltage
4. It could be distributed to far
distance with low voltage
drop
5. It is more efficient compared
with direct current