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The Book of Terms

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.

   

 

All   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

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.

Trap Wire

1) A hard mild steel or steel wire, usually copper coated, in sizes 1.4 to 2.6 mm in diameter. 2) Stranded conductors made up of trapezoidal-shaped wires, rather than round wires.

Trauwood Process

A process for patenting, hardening and tempering and annealing in which the steel rod or wire is heated by electric resistance heating. The rod or wire is passed continuously through two baths of molten lead, which act as con­tacts, so the length between them carries an electric current, which heats it by electric resistance heating. In patenting, the second lead bath is designed to act also as the quench bath.

Traveler

A pulley complete with suspension arm or frame to be attached to overhead line structures during stringing.

Traveling Table

Device used to transfer product during a rolling operation that is integrated with tilting and automatic turning with each successive pass.

Tray

A unit or assembly of units or sections and associated fittings, made of metal or other noncombustible materials that form a rigid structural system used to support cables.

Tray Cable

Type TC, an assembly of two or more insulated conductors with an overall jacket rated for use in cable trays, including conductors for power, control, and signaling circuits.
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