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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

Ferrous Oxide

The first oxide to form on rod or wire. Comparatively soluble in pickling acid, with a hardness of up to about 350 dph, it is almost entirely covered by the magnetite and hematite. Also known as wüstite. See Ferric Oxide and Ferrosic Oxide.

Ferrous Sulfate Crystal

Byproduct removed from sulfuric acid used to remove scale from steel in a cleaning (pickling) process. During the cleaning process, the scale is removed from the surface by acid that is heated to accelerate the removal of scale. The acid is then cooled to a temperature below 10°C (50°F) to create this crystal, which is lime green in color.

Ferrovanadium

A product that contains iron and about 38 percent vanadium. Used as a finisher for adding vanadium to steel.

Ferrule

A short tube used to make solderless connections to shielded or coaxial cable. Also molded into the plastic inserts or multiple contact connectors to provide strong, wear-resistant shoulders on which contact-retaining springs can bear.

FET

Designation for Field Effect Transistor.

FEXT

Designation for Far-End Cross-Talk, a decibel measure of disturbing signal transferred from one pair to the opposite end of a de-energized pair.

FF

Designation for fixture wire. The commercial type is a UL-approved fixture wire and is constructed from a stranded copper conductor, rubber insulation and cotton braid.

FF-1

Designation for fixture wire, flexible, rubber insulated, single conductor, 300V, 60°C.

FF-2

Same as FF-1, with 600V rating.

FFC

Designation for Flexible Flat Cable.

FFH-1

Designation for heat resistant fixture wire, otherwise same as FF-1, 300V.

FFH-2

Same as FFH-1, with 600V rating.

FHOF

Designation for a type of shipboard cable that is a four-conductor, heat and oil resistant flexible cable, 600 volt, 16 AWG to 250 mcm.

Fiber

A single, separate optical transmission element characterized by core and cladding. See listings for Fiber Optics in back section of book.

Fiber Insulation

Fiber used as an insulating material in electrical wire manufacturing by wrapping it in single, double or triple layers around the conductor in a helical fashion. Fiber insulations are the space type and provide excellent resistance to burn out and overload conditions.

Fiberglass

Glass used in a fibrous form, such as a yarn, that can be used for braiding when high heat and moisture resistance are necessary. While not as abrasion-resistant as cotton, it is satisfactory for most applications and can, if necessary, be protected with an extruded nylon jacket.

Fibrous Filler

A material used to fill interstices in cables made from fibers such as cotton, glass, etc.

Fidelity

The degree to which a system accurately reproduces an input.

Field

An area of influence around a magnet or electric charge.

Field Coil

A suitable insulated winding to be mounted on a field pole to magnetize.
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