Lightning Protection, Grounding,
& Surge Suppression Glossary of Terms

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Telecommunications Equipment Room (TER)
Any transmission, emission, and reception of signs, signals, writings, images, and sounds, i.e. information of any nature by cable, radio, optical, or other electromagnetic systems. (TIA/EIA 607)
Thermal Sparking
Occurs when a very high current is forced to cross a joint between two conducting materials which have an imperfect bonding or mating between their surfaces.
Total Power Factor
The ratio of the total power input, in watts, to the total volt-ampere input.
Total Surge Energy
Total sum of surge energy for all lines of a protector unit. Measured in joules. The minimum total energy which results in the failure of the unit.
Transfer Impedance
Referring to coax, is the impedance to transfer into or outside the coax at various frequencies usually below 1 MHz. Due to loss of skin effect attenuation or shielding at these low frequencies, coax can be susceptible to interference and noise as well as the radiation of such signals.
Transfer Inductance
The property of a circuit whereby a voltage is induced in a loop by a changing current in another circuit, some part of which is included in the loop.
Transfer Time
The time that it takes an uninterruptible power supply (UPS) to transfer the critical load from the output of the inverter to the alternate source, or back again.
Transient
A subcycle disturbance in the ac waveform that is evidenced by a sharp, brief discontinuity of the waveform, which may cause signal impairments, loss of memory or physical damage to electrical and electronic equipment.. May be of either polarity and may be additive to, or subtractive from, the nominal waveform. See also: Notch; Overvoltage; Swell.
Transient Voltage Surge Suppressor (TVSS)
A device that functions as an SPD or surge suppressor.
Transverse-Mode Noise
With reference to load device input ac power: Noise signals measurable between or among active circuit conductors feeding the subject load, but not between the EGC or associated SRS and the active circuit conductors.
Turn-on Voltage
The voltage required across a transient suppressor terminal to cause the suppressor to conduct current.