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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

Hot Stamping

A method of alpha numerical coding. Identification markings are made by pressing heated type and marking foil into softened insulation surfaces. See marking entries.

Hot Tin Dip

A process of passing bare wire through a bath of molten tin to provide a coating.

Hot Top

An insulated reservoir to hold molten metal on top of a mold to continuously fill the central void (known as pipe) created as the casting contracts during solidification. Also called shrink head or feeder head.

Hot Wire Drawing

The application of heat to the wire prior to its entry into the die. One example where this may be done is for tungsten wire used for lamps.

Hot Working

Plastic deformation of metal at such temperature and rate that strain hardening does not occur. The lower limit of temperature for this process is the re-crystallization temperature or about half the absolute melting point. See Hot Forming.

Hot-Melt Filtering

The technique of filtering the molten metal to remove impurities and reduce the probability of inclusions in the finished product.

Hour-Glass Springs

Springs used for bed­ding and upholstery that taper towards the center from each end. The combined effect of a large and a small spring is ob­tained, the larger coils being gentle in their resistance and the smaller ones harder. Also known as double-cone or Bonnell springs.

HP

Designation for: 1) Horsepower, 2) High pressure.

HPD

Designation for rubber and asbestos-insulated heater cord. No braid on individual conductors, but braid overall. Also made with neoprene insulation and no asbestos or NBR/PVC or with CSPE.

HPN

Designation for two-conductor, neoprene-insulated heater cord. Parallel construction. For use in damp locations.

HR

Rockwell hardness value. Typically expressed with a letter after it to indicate the scale used to determine the value. For example, HRC uses the “C” scale.

HS

600V rated Rubber insulated Heater Cord.

HSHD

Designation for High-Speed Hot Dipping.

HSJ

Designation for 300V rated rubber insulated heater cord.

HSJO

Same as type HSJ, but with neoprene jacket.

HSJOO

Same as HSJ but with oil-resistant insulation and jacket.

HSL Type Cable

A screened cable.

HSO

Designation for neoprene jacketed heater cord.

Hub

1) A fitting to attach threaded conduit to boxes. 2) The central part of a cylinder into which a shaft may be inserted. 3) A reference point used for overhead line layout.

Hubbel-Welaburg Process

An electro-galvanizing process using either soluble zinc anodes or insoluble graphite or magnetite electrodes in an ammoniacal solution as electrolyte.
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