Terminating and connecting electrical wiring and electronics circuit

Computer System Servicing by JTiemsin

TERMINATING AND CONNECTING ELECTRICAL WIRING AND

ELECTRONICS CIRCUIT (TCEW)Lesson 6


• Conductors are materials that permit electrons to flow freely.• Silver• Copper• Aluminum

• Insulators are materials that blocks the flow of electrons.• Rubber• Plastic

Conductors and Insulators


Increasing Conductivity Ability

Rubber

Glass

Wood

Dry Air

Silicon

Germanium

Water

Carbon

Mercury

Iron

Aluminum

Copper

Silver

Insulator Semi-conductor Conductor


Identify conductors and insulatorsCONDUCTORS INSULATORS


Wires and CablesWires and cables are used synonymously but they are quite different.

A wire is a single conductor(material most commonly being copper or aluminum) while cable is two or more insulated wires wrapped in one jacket.

Is this a wire or a cable?


Types of Electrical Wires

Solid wire• A single conductor that is either bare or insulated.

Stranded wire• Composed many thin strands of wires twisted together. • Used where flexibility is important because which the wire can be

used for a longer period.


Solid Wires Stranded Wires


Types of Electrical Cables

1. Twisted pair cable – A twisted pair cable has two cables that are twisted across each other. Twisting can avoid noise that produced by magnetic coupling, so this type of cable is best suited for carrying signals. It is generally used in telecommunication and data communication.


2. Multi-conductor cable – Multi conductor cable has two or more conductors that are insulated from each other. Their purpose is to protect signal integrity by reducing hum, noise and crosstalk. Applications include computers, communications, instrumentation, sound, control, audio, and data transmission.


3. Coaxial cable – Coaxial cable is composed of an inner solid conductor surrounded by a paralleled outer foil conductor that is protected by an insulating layer. The two conductors are separated from each other by an insulating dielectric. Coaxial cables are generally used in TV Cable.


4. Fiber optics cable – This kind of cable transmits signals by a bundle of glass threads. Fiber optic cables have a much greater bandwidth than metal cables, which means they can carry more data. They are also less susceptible to interference. For these two reasons, fiber optic cables are increasingly being used instead of traditional copper cables despite that they are expensive.


Wire TerminationElectrical termination is an electrical industry term used to describe the specific point at which a conductive device, such as wire or cable, ends or starts. A wire typically ends, or terminates, at the terminal block; but the electricity or signal may be passed onto the terminal connectors.


Wire termination methodsSoldering

Soldering is a process in which two or more metal items are joined together by melting and then flowing a filler metal into the joint—the filler metal having a relatively low melting point.


Crimping

Crimping is joining 2 pieces of metal or other ductile material (usually a wire and a metal plate) by deforming one or both of them to hold the other.

RJ45

Crimping Tool


Keystone Jack Keystone Jack Termination Tool


Ribbon Cable Connector

Hand Press Ribbon Cable Connector


References:http://www.dsmt.com/resources/termination-options/

http://www.assemblymag.com/articles/83099-wire-termination-uses-and-methods

http://www.physicsclassroom.com/class/estatics/Lesson-1/Conductors-and-Insulators

http://www.copperwiregranulator.com/gallery/Difference-between-Wire-and-Cable.html

http://www.sciencebuddies.org/science-fair-projects/project_ideas/Elec_primer-solder.shtml

Education

Terminating and connecting electrical wiring and electronics circuit