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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

NO

Designation for Normally Open.

No-Twist® Mill

High-speed portion of a rod rolling mill with consecutive sets of rolls placed at right angles to the previous set to eliminate the need for manipulating (twisting) the rolled section to achieve final shape. The term is a registered trademark of Morgan Construction Company.

Noble Metals

Metals such as gold, silver and platinum that are resistant to corrosion by all but the most powerful acids.

Node

A junction of two or more branches of a network.

Noise

In a cable or circuit, any extraneous signal which tends to interfere with the signal normally present in or passing through the system.

Nomex®

DuPont’s trademark for a temperature-resistant, flame-retardant nylon.

Nomex® Yarn

A product manufactured by DuPont for use in braiding applications. It is a soft, pliable fiber that melts at high temperatures (approximately 370°C/698°F). It is a highly oriented fiber and does not offer the abrasion resistance of the less oriented fibers such as nylon or polyester.

Nominal

Relating to a designated size that may vary from the actual. This would generally be recognized as the aim-point of a specification.

Non-Accumulating Machinery

A wiredrawing machine with continuous non-slip operation and individual block motors. Dancer arms or rollers mounted on the machine between each block control the speed of each motor.

Non-Conductor

An insulating material.

Non-Contaminating

Type of PVC jacket material whose plasticizer will not migrate into the dielectric of a coaxial cable and thus avoids contaminating and destroying the dielectric.

Non-Contaminating Compound

A compounded material that will not leach ingredients so as to contaminate or degrade adjacent materials under given environmental conditions.

Non-Draining Cable

Impregnated cable that will not exude the impregnating material under working con­ditions. It may be of the mass-impregnated (MIND, or mass-impregnated-non-draining) or pre-impregnated type.

Non-Halogen

See Halogen-Free.

Non-Hygroscopic

A material incapable of taking up or absorbing moisture from the air.

Non-Magnetic Inclusions

Small nonferrous particles of foreign material embedded in the microstructure of the wire. Sources can be furnace refractory, launder refractory, pouring spout oxide and slag.

Non-Metallic Inclusion

Non-metallic foreign material introduced into the metal during the manufacturing process.

Non-Metallic Sheathed Cables

The most common form of wiring used in houses since 1950. It typically employs Type THHN conductors. In two-conductor cables, the conductors are laid parallel under the jacket, while three conductor cables have the conductors cabled under the jacket.

Non-Slip Drawing Machine

A wiredrawing machine in which the capstans run at exactly the same speed as the wire being drawn. Used primarily for dry drawing ferrous wires.

Non-Specular Conductor

A conductor in which the outer layer has been physically treated to reduce light reflectance.
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