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Impedance
The total opposition offered to the flow
of an alternating current. It may consist of any combination of resistance,
inductive reactance, and capacitive reactance.
Inductance
The ability of a coil
to store energy and oppose changes in current flowing through it. A function
of the cross sectional area, number of turns of coil, length of coil and
core material.
Induction
The act or process of producing voltage
by the relative motion of a magnetic field across a conductor.
Input Power Frequency
This is the
frequency range that can be input into the suppressor without damaging it.
In Sight From
(Within sight
from, within sight) Where this Code specifies that one equipment shall be
"in sight from", "within sight from" or "within sight", etc. of another
equipment, the specified equipment is to be visible and not more that 50´
distant from the other
Interrupter Rating
The highest
current at rated voltage that a device is intended to interrupt under
standard test conditions.
Joule
A measure of the amount of energy
delivered by one watt of power in one second, or 1 million watts of power in
one microsecond. The joule rating of a surge protection device is the amount
of energy that it can absorb before it becomes damaged. In comparing surge
protection performance, the Joule rating of a surge suppressor is less
important than the let-through voltage rating. This reflects the fact that
surge suppressors may protect equipment by deflecting surges as well as
absorbing them. There is no standard for measuring the joule rating of surge
suppressors which has resulted in wildly exaggerated claims by unscrupulous
vendors.
Kilo-- (K)
A metric prefix meaning 1000 or 103.
KVA
(Kilovolt amperes) (volts
times amperes) divided by 1000. 1 KVA=1000 VA. KVA is
actual measured power (apparent power) and is used for circuit sizing.
KW
(Kilowatts) watts divided by
1000. KW is real power and is important in sizing Uninterruptible Power
Supplies, motor generators or other power conditioners. See also "power
factor".
KWH
(Kilowatt hours) KW times
hours. A measurement of power and time used by utilities for billing
purposes.
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