Util 1 Chapter 3 Flashcards
requires four wires in which there are three phase conductors and one neutral conductor. Such type of connection is mainly used for long distance transmission because it has a neutral point. The neutral point passes the unbalanced current to the earth and hence make the system balance.
Star Connection
has three wires, and there is a no neutral point. The delta connection is shown in the figure below. The line voltage of the delta connection is equal to the phase voltage.
Delta Connection
it is an industrial facility that houses the prime mover, electric generator and auxiliaries for conversion of mechanical energy, chemical energy and/or nuclear energy into electrical energy. It is a facility or system for the generation of electric power.
Power Station
conductors that carry power from the transformer through a metering device to the building’s service disconnects. These may be overhead or underground.
Service Entrance Conductors
overhead wires extend from a pole-mounted distribution transformer to the building’s service entrance. Overhead service entrance conductors extending from pole mounted transformers.
Service Drop
underground (buried) service entrance conductors.
Service Lateral
it includes the components that connect the utility-supplied wiring (the service lateral or service drop) to the service disconnect, excluding the utility’s metering equipment.
Service Entrance
receives the service entrance conductors. The service equipment includes a method of measuring power (metering equipment), a method of cutting off power (main disconnect or switch gear), and overcurrent protection devices (circuit breakers or fuses) that protect the service entrance conductors.
Service Entrance Equipment
it is a required part of the service entrance equipment that allows electrical service from the utility company to be switched off so that power is disconnected to the building installation. It is a set of fuses or a circuit breaker that protects the service entrance conductors
Service Disconnect
a mechanical switching device used to isolate a circuit or an equipment from the supply side. It could either be fused or non-fuse type.
Disconnect (Safety Power Switch)
it is a large cabinet or assembly of metal cabinets in which is connected disconnecting switches, overcorrect protection devices (fuses or circuit breakers), other protective devices, and instruments designed to divide large amounts of electrical current into smaller amounts of current used by electrical equipment.
Switchboard
it is one or more metal cabinets that serve as a single unit, including buses, automatic overcurrent protection devices (fuses or circuit breakers). It is equipped with or without switches for the control of light, heat, and power circuits.
Panelboard
are used in transmitting and distributing power from the power plant to a substation. The operation of a large commercial installation depends on power distribution that, in turn, depends on transformers used to change voltage, current, and phase of electrical power nearby and within a building.
Transformer
they safeguard the building service or an individual circuit from excessive current flows. It protects the circuit components from severe overheating when current flowing through the circuit reaches an amperage that will cause an excessive or dangerous temperature rise in conductors.
Fuses and circuit breakers serve as automatic overcurrent protection devices. They are designed to open a circuit if the amount of current, in amps, that flows through the circuit exceeds the OCP device rating.
Overcurrent Protection (OCP) Devices
It is a device designed to open (or trip) 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.
Circuit Breakers
It is an overcurrent protective device with a circuit opening fusible part that is heated and severed by the passage of overcurrent through it.
Fuse
is the highest current it can carry continuously without exceeding a specific temperature limit (e.g., without overheating).
Overcurrent Rating
it is the current that a fuse is able to interrupt without being destroyed or causing an electric arc with unacceptable duration.
Interruption Capacity
it is a broad category of electrical or electronic machine or instrument designed to perform a specific mechanical, chemical, heating, or lighting function through the use of electrical energy.
Utilization Equipment
it is an end-use piece of utilization equipment designed to perform a specific function such as cooking, cleaning, cooling, or heating.
Electric Appliance
it is a component in an electrical system that is designed to carry but not use electricity. This includes components such as switches, receptacles, and relays.
Electrical Device
it is the location in a branch circuit where electricity is used. For example, a lighting outlet is the location in a branch circuit where conductors provide power to a light fixture.
Outlet
it is a female connecting device with slotted contacts. It is installed at an outlet or on equipment, where it is intended to easily establish an electrical connection with an inserted plug.
Receptacle
it is a male connecting device that has two or more prongs that are inserted into a receptacle to connect to an electrical circuit.
Plug
