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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

SEOW

Designation for a 600 volt hard service cord with oil-resistant thermoplastic elastomer insulation and jacket.

Separable Insulated Connector

An insulated device to facilitate power cable connections and separations.

Separator

A part of a conductor or cable assembly used to isolate components from each other. A layer of insulating material that is placed between a conductor and its dielectric, between a cable jacket and the components it covers, or between various components of a multiple-conductor cable.

Sequential Marking

The continuous measuring and ink-indented marking of communication and control cables. Sequential marking normally takes place in extrusion lines but is also employed in rewind lines or separate operations.

SER

Designation for cable like type SE, Style R, service entrance cable. Like SEA, but not armored. And conductors are insulated with XLPE.

Series Circuit

A circuit in which the components are arranged end-to-end to form a single path for a current.

Series Resistance

Any number of resistances installed in sequential order within one circuit. The resistance of the entire circuit is equal to the sum of the individual resistances.

Serpentine Spring Wire

High tensile wire used for S-shaped furniture spring forms. Also called sinuous wire.

Served Wire Armor

Spiral wrap of soft galvanized steel wires applied to a cable to afford mechanical protection and increase the cable pulling tension characteristics.

Service Center

An operation that buys metal, warehouses it, often processing it in some way, and then sells it in a slightly different form or amount from what was purchased from producing mills.

Service Conductors

Conductors extending from the utility company’s street main connection point or transformer to the service equipment.

Service Drop

Overhead service conductors run from a utility company pole to the point of connection to the building’s service entrance conductors.

Service Drop Wire

Outside wires connecting the communications circuit to each subscriber’s residence wire for telephone service. They are relatively short in length and therefore contribute little to system losses. For this reason, their mechanical properties are important in design considerations.

Service Entrance

The conductors that connect the service conductors (drop or lateral) to the service equipment of a building.

Service Equipment

The equipment necessary to contain the main power control and cutoff, typically including a main power disconnect, fuses or circuit breakers, and related accessories. It is located near the point at which the service entrance enters the building.

Service Head

Component located on a structure to receive the electrical power line from a utility company. At the service head, house wires connect to the utility wires and lead down the side of the house to a meter and into the house to a service panel.

Service Lateral

Underground service conductors run from the utility company’s street main to the point of connection to the building’s service entrance conductors or service equipment.

Servo

Short for Servo Motor or Servomechanism (see entries).

Servo Motor

Technically, any motor equipped with a feedback device can be considered a servo motor. Most commonly though, the term refers to a low inertia type of motor designed for accurate and quick response for positioning applications.

Servo Motor, DC Brushed-Type

A brushed-type DC servo motor operates much like a standard industrial DC motor. It has a wound rotor, permanent magnet stator and brushes and a commutator to switch windings as the motor rotates. Since the fields are fixed magnets, the speed range is limited from 0 to base speed, i.e., not constant horsepower above base speed.
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