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The Book of Terms

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The Book of TermsThe WJI Book of Wire & Cable Terms: an interactive experience of learning and sharing
This book, written by industry volunteers and containing more than 5,000 entries, is an asset for newcomers to wire and cable.

At the same time, it also represents an opportunity for industry veterans to give back by either updating or adding to the more than 5,000 entries. This is an honor system process. Entries/updates must be non-commercial, and any deemed not to be so will be removed. Share your expertise as part of this legacy project to help those who will follow. Purchase a printed copy here.

   

 

0-9   A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Transfer Route

Technique of transferring product to a new spooler for continuous in-line production.

Transfer Switch

A device for transferring one or more load conductor connections from one power source to another.

Transfer, Chain

A device used to move material in a rolling operation from a roughing stand to an intermediate stand.

Transformation Range

The temperature range in which a constitutional change occurs on heating or cooling a metal in the solid state. For ferrous materials, it is the range where austenite forms and ferrite or carbide progressively dissolves while ferrous alloys are being heated. Also, the temperature range within which austenite decomposes to form ferrite and carbide on cooling.

Transformer

An electrical device which changes voltage in direct proportion to currents and in inverse proportion to the ratio of the number of turns of its primary and secondary windings.

Transformer Strip

Rectangular or square section strip can be produced by drawing, rolling or a combination of both. Strip up to about 15 mm wide and 5 mm thick is drawn on conventional multiple drawing machines using shaped dies. Though product quality is high, a large stock of dies is necessary, die wear is heavy, drawing speeds are relatively slow and the soft temper inlet material is expensive.

Transformer, Auto

Any transformer where primary and secondary connections are made to a single cell.

Transformer, Potential

Designed for use in measuring high voltage. Normally the secondary voltage is 120V.

Transformer, Power

Designed to transfer electrical power from the primary circuit to the secondary circuit(s) to step up the secondary voltage at a lower current or step down the secondary voltage at a higher current. The voltage-current product remains constant for either the primary or secondary circuit.

Transformer, Safety Isolation

Inserted in the inlet power side to isolate the lines of power on the transformer’s secondary from the other lines attached to the same original power source. This provides a non-grounded power supply for safety or personnel and protection from some electrical surges or load losses in the equipment.

Transformer, Vault-Type

Suitable for occasional submerged operation in water.

Transient

1) Lasting only a short time; existing briefly; temporary. 2) A temporary component of current existing in a circuit during adjustment to a charged load, different source voltage or line impulse.

Transition Point

1) The temperature of transformation from one solid crystalline form of a substance to another. More broadly, the point where different phases can exist in equilibrium. 2) A location in the horizontal cabling where flat under-carpet cable connects to round cable.

Transmission Cable, Communications

Two or more transmission lines. If the structure is flat, it is sometimes called flat transmission cable to distinguish it from a round structure such as a jacketed group of coaxial cables. See Transmission Line, Communications.

Transmission Line, Communications

A signal-carrying circuit with controlled electrical characteristics used to transmit high frequency or narrow-pulse signals.

Transmission Loss, Communications

In electrical cables, the decrease or loss in power during transmission of energy from one point to another.

Transmission Media, Communications

The various types of wire and optical fiber cable used for transmitting voice or data signals. Typically, wire cable includes twisted pair, coaxial and twin axial.

Transmission, Power

Transfer of electric energy from one location to another through conductors or by radiation or induction fields. The transfer always is accompanied by energy loss, which is inversely proportional to the efficiency of the medium through which the transmission occurs.

Transmitter

1) A device, which converts an electrical signal to an optical signal. 2) The electronic package that injects an electrical signal or light signal over the transmission medium.

Transverse

Literally, “across,” usually signifying a direction or plane perpendicular to the direction of working.
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