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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

Necking

Localized reduction in area of a specimen during tensile deformation. The narrowing, or constricting to a smaller cross-sectional area, which occurs while a test piece is being pulled. The narrowing of the diameter of a wire at the point at which a break is about to occur, as appears in tensile testing.

NEC®

1) See National Electrical Code. 2) Designation for Natural Electrical Code (ANSI/NFPA 70).

Needle Die Polishing Machine

Employs a rotating needle and revolving die spindle fed with diamond powder for polishing wiredrawing dies.

Negative

Connected to the negative terminal of a power supply.

Negative Butt Lap

See Butt Lap.

Negative Lap Wound

See Taped Insulation.

Neoprene Rubber

Dupont trade name for synthetic rubber known as polychloroprene, which is used for wire and cable jacketing. Although the electrical properties of neoprene are inferior to many other insulations, they are adequate for low-voltage work. Its physical properties are similar to natural rubber, but it is considerably better from the standpoint of resistance to oil, ozone, heat, weather, sunlight and aging. It does not support combustion and resists abrasion and cutting.

Neoprene Tubing

A tube made of neoprene, which is used by cable pullers as a jacket.

Neper

A unit, analogous to the decibel (dB), which can be used to express ratios such as voltage.

Netting

Open, meshed material resembling cloth, produced mainly in finer steel wires of soft quality to offer high pliability. Available in mesh diameters of 3 to 100 mm. The principal type has hexagonal meshes. Ideal where a light retaining wire mesh is required at low cost. Netting wire is produced from low carbon steel and drawn to various sizes from 0.7 to 2 mm. in diameter. Finish, full-annealed. The material is galvanized after weaving.

Network

1) An aggregation of interconnected conductors consisting of feeders, mains and services. 2) Series of points connected by communications channels. 3) Interconnected series of telephone lines normally used for dialed telephone calls. 4) Series of communications channels connected for the use of one customer.

Network Limiter

A current-limiting fuse for protecting a single conductor.

Neutral

The element of a circuit from which other voltages are referred with respect to magnitude and time displacement in steady state conditions.

Neutral Conductor

In multiphase circuits, the conductor used to carry an unbalanced current. In single-phase systems, the conductor used for a return current path.

Neutral Fats

An ingredient in mineral oil base coolant to enhance lubrication.

Neutralizers

See Inhibitors and Pickling.

New British Standard

See British Standard Wire Gauge.

Newton

The derived SI unit for force. It is the force that will give one kg mass an acceleration of one meter per second.

NEXT

Designation for Near-End Crosstalk, a decibel measure of disturbing signal transferred from one pair to the same end of a de-energized pair.

Nib

1) The cylindrical blank of sintered tungsten carbide or other die material, either solid or with a preformed hole, from which a drawing die is produced. Solid (one piece) nibs are press-fit into steel cases for use in wiredrawing machines. Split nibs are used in special metal holders. 2) The metal in a synthetic or natural diamond die that holds the diamond.
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