Halar
Ausimont Co. trademark for ethylene chlorotrifluoroethylene (ECTFE)

Half-Duplex
two-way communications in which data is sent in only one direction at a time

Half-Drawn Wire
As applied to aluminum and copper, wire that has been cold drawn to final size so as to approach the maximum strength attainable

Harness
An arrangement of wires and cables, usually with many breakouts, which have been tied together or pulled into a rubber or plastic sheath, used to interconnect an electric circuit

Hash Mark Stripe
A noncontinuous helical stripe applied to a conductor for identification

Hazardous Location
Ignitable vapours, dust or fibers that may cause fire or explosion as defined in Article 500 of the NEC

HDPE
High density polyethylene

HDTV
High definition television

HDX
Half-Duplex Transmission. Transmission in either direction but not in both directions simultaneously. Compare with full-duplex transmission

Head-End
A central point in broadband networks that receives signals on one set of frequency bands and retransmits them on another set of frequencies

Heat Distortion
Distortion or flow of a material or configuration due to the application of heat

Heat Seal
Method of sealing a tape wrap jacket by means of thermal fusion

Heat Shock
A test to determine stability of material by sudden exposure to a high temperature for a short period of time

Heat Sink
A device that absorbs heat

Heater Cord
A group of cable types defined in Article 400 of the NEC. Types HPD, HPN, HS, HSJ, HSJO and HSO

Helical Stripe
A continuous, colored, spiral tripe applied to a conductor for circuit identification

Helix
Spiral unwinding

Henry
A unit of inductance equal to the inductance of a current changing at the rate of 1 ampere per second inducing a counter electromotive force of 1 volt

Hertz (Hz)
Cycles per second. A cycle that occurs once every second has a frequency of 1 Hertz. The bandwidth of the average phone line is between 300 and 3,000 cycles per second

HF
High Frequency

HID
High Intensity Discharge as in mercury metal halide and sodium lamps

High Bond Insulation
Insulation exhibiting great bond strength to the conductors

High-Split
A broadband cable system in which the bandwidth utilized to send toward the head-end (reverse direction) is approximately 6 MHz to 180 MHz, and the bandwidth utilized to send from the head-end (forward direction) is approximately 220 MHz to 400 MHz. The guard band between the forward and reverse directions (180 MHz to 220 MHz) provides isolation from interference

High Temperature Wire and Cable
Electrical wire and cables having thermal operating characteristics of 150ºC and higher

High Tension Cables
Generally the high voltage ignition wires for combustion engines, gas and oil ignitors, or neon signs, etc (Unshielded). Usually type GTO

High-Voltage Cable Termination
A device used for terminating alternating current power cables having laminated or extruded insulation rated 2.5 kV and above

High-Voltage Power (system voltage ratings)
A class of system voltages equal to or greater than 69,000 volts or kess than 230,000 volts

Hinge Cable
A cable connected between a hinge or swinging device and a stationary object

Hipot
A DC high potential test used on medium and high voltage cables. See Dielectric Strength Testing

HMWPE
High molecular weight polyethylene

Holding Strength
Ability of a connector to remain assembled to a cable when under tension

Hook-Up Wire
Small wires used to hook up instruments or electrical parts, usually 12 AWG and smaller

Hot Modulus
Stress at 100% elongation after 5 minutes of conditioning at a given temperature (normally 130ºC)

Hot Stamping
Method of alphanumeric coding. Indentification markings are made by pressing heated tape and marking foil into softened insulation surfaces

Hot Stick
A long insulated stick having a hook at one end which is used to open energized switches, etc.

Hot Tin Dip
A process of passing bare wire through a bath of molten tin to provide a coating

Housing
A metallic or other enclosure for an insulated splice

HPD
A UL cable type. Two, three or four conductor heater cord with thermoset insulation and cotton or rayon outer covering. For use in dry locations

HPN
A UL cable type. Two or three conductor, thermosetting-insulated heater cord. Parallel construction. For use in damp locations

HSO
A UL cable type. Thermoset jacketed heater cord

HV
High Voltage

Hybrid Cable
Multiconductor cable containing two or more types of components

Hydroscopic
Readily absorbing and retaining moisture

Hygroscopic
Readily absorbing and retaining moisture

Hypalon
DuPont's trademark for chlorosulphonated polyethylene (CSP)

Hypot®
See Hipot. Registered trade name of Associated research Inc. for their high-voltage tester

Hysteresis
The time lag exhibited by a body in reacting to changes in forces affecting it; an internal friction

Hz
Hertz. A measure of frequency or bandwith equal to one cycle per second. Named after experimenter Heinrich Hertz

Hazardous Area Information - Cable Entry Systems
It is essential that cable entry systems comply with all the requirements referred to in the appropriate apparatus standard, that the cable entry device is appropriate to the type of cable employed, maintains the respective method of protection and is in accordance with the CENELEC and IEC Degree of Protection, IP Code

Where cables enter into flameproof apparatus via flameproof bushings through the wall of the enclosure which are part of the apparatus (indirect entry), the parts of the bushings outside the flameproof enclosure will be protected in accordance with one of the types of protection listed in IEC 79-0. Normally the exposed part of the bushings will be within a terminal compartment which will either be another flameproof enclosure or will be protected by protection type 'e'. Where the terminal compartment is Ex'd', then the cable system shall comply with 'Selection'. Where the terminal compartment is Ex'e', then the cable system shall comply with 'Hazardous Area Information - Wiring Systems Where cables enter into flameproof apparatus directly, the cable system shall comply with 2.2

Hazardous Area Information - Wiring Systems
Cables and conduits shall be installed in accordance with the CENELEC and IEC Degree of Protection, IP Code and the following additional requirements concerning cable entries and conductor terminations