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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

Nonferrous Metals

Refers to metals and alloys that are not iron based.

Nordel®

DuPont trade name for EPDM.

Normal Distribution

See Distribution, Statistical Analysis.

Normalize

Heating steel to and, holding at a suitable temperature above the trans­formation range, followed by cooling freely, in order to modify the grain size, render the structure more uniform and usually to improve the mechanical properties.

Notch Brittleness

Susceptibility of a material to brittle failure in a portion of the wire containing a groove, scratch, sharp fillet or notch.

Notch Fatigue Factor

The reduction in fatigue strength caused by the presence of a sharp notch.

Notch Sensitivity

The reduction in strength, impact, static or fatigue caused by the presence of a stress concentration, usually expressed as the ratio of the notched to the un-notched strength.

NP

Designation for Nickel Plate.

NR

Designation for: 1) Nonreturnable Reel; a reel designed for one-time use only. 2) Natural Rubber.

NRHW

Designation for moisture and heat-resistant rubber insulation with neoprene jacket for use in ducts. Dry and wet locations, 600V, 75°C. Also RHWN.

NSD

Designation for Neutral Supported Drop. A type of service cable.

Nucleus

1) The first structurally stable particle capable of initiating the recrystallization of a phase or the growth of a new phase, and which possesses an interface with the parent matrix. Also refers to a foreign particle that initiates such action. 2) The heavy central core of an atom, in which most of the mass and the total positive electric charge are concentrated.

Nut Wire

Wire used for the cold forming of threaded nuts. A severe heading operation is used requiring hard drawn wire from nor­malized or annealed rods, or annealed-in-process wire, depending upon the application. The wire must be able to withstand both cold heading and thread tapping.

NVP

Designation for Nominal Velocity of Propagation, expressed as a percentage of the speed of light (c).

Nylon

A synthetic fiber made from crude oil and natural gas that often is used in conductor jacketing material. This plastic has great toughness, strength and elasticity, high melting point and good resistance to water and to most chemicals. Its abrasion resistance is superior to polythene and PVC, and because of this it is often used as a sheathing material on previously jacketed polythene or PVC cables or wires, and is simple to apply to wire or cable.

Nylon 11

A manufactured fiber in which the fiber forming substance is any long chain synthetic polymide having recurring amide groups (-NH-CO-) as an integral part of the polymer chain. Its uses include as a versatile and popular plastic finish available for coating wirework. It has excellent compact resistance that led to its use in the fur­niture industry and also for supermarket self-service baskets.

Nylon Jacketed

Encased in an outer covering of nylon. On wire or cable, this can be either an extruded layer or a braid of nylon filaments.
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