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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

MV

Designation for medium voltage, 35KV.

MV-105

Designation for medium voltage, 105°C operating temperature.

MV-90

Designation for medium voltage, 90°C operating temperature.

Mw

1.) Designation for megawatt, 106 watts.
2.) Designation for radio hookup wire with polyvinyl insulation and plain or nylon-jacket, braid or shield, 1000V.

MYD

Designation for marina yard and dock cable.

Mylar®

A registered trademark for DuPont’s polyethylene terephthalate (polyester) film, a synthetic compound with high dielectric qualities.

N

Designation for: 1) Nanometer, or 10-9 m. 2) Newton, or 1 kg m/s2. Measures force.

N-Conductor Cable

A cable having N-conductors that are insulated from one another. “N” represents the number of insulated conductors in the cable.

N-Conductor Concentric Cable

A cable composed of an insulated central conductor with conductors concentrically twisted around it and separated from each other by layers of insulation.

N/C

Designation for Numerical Control.

Nail Wire

Mild or medium carbon steel wire in round, oval and square shapes with a bright finish. Thick sizes are finished from rod and thin sizes from direct-drawn or annealed wire that all must be able to provide the essential hardness consistent with the sizes and types of nail.

National Electrical Code®

Designations for the United States electrical code. A U.S. consensus standard published by the National Fire Protection Association (NFPA) and incorporated in OSHA regulations. The types and sizes of electrical conductors and methods by which building wire is installed are established by this agency. Local codes that have the force of law generally follow national codes. The Canadian designation is CEC.

Natural Diamond Die

See die entries.

Natural Rubber

Rubber by itself is lacking in many properties required of wire and cable insulating and jacketing materials. However, by proper compounding and mixing with other products, it can be converted to a material with excellent physical properties, good electrical properties and fair to moderate ozone resistance and chemical resistance.

NBC

See NBR/PVC.

NBR

Designation for Natural Butyl Rubber.

NBR/PVC

Designation for a blend of acrylonitrile butadiene rubber and polyvinyl chloride (PVC).

NBS

Designation for New British Standard. See British Standard Wire Gauge.

NC

Designation for normally closed contacts on a switch, relay or controller.

Necked Down

See Necking.
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