Lightning Protection, Grounding,
& Surge Suppression Glossary of Terms

Your search returned:

IEEE
Institute of Electrical and Electronic Engineers.
Impedance
A unit of measure, expressed in Ohms, of the total opposition (resistance, capacitance and inductance) offered to the flow of alternating current.
Impulse
See: Transient
Induced (bound) Charge
Induced charge, also called bound charge, may be caused by nearby storm cloud discharges or the flow of product into open floating roof tanks (commonly used for fuel and chemical storage) and can cause ignition when they discharge suddenly (arc) across air gaps.
Induced Ground Charge
Generally, a positive charge is induced in the ground below the clouds; the repulsive force of the negatively charged cloud pushes the electrons on the ground down and away from the surface, leaving the surface of the ground positively charged. The potential difference between the clouds and the ground can be as high as a billion volts.
Inductance
The ability of a coil to store energy and opposite changes in current flowing through it.
Inductive Coordination Practice
The interrelation of neighboring electric supply and communication circuits by electric or magnetic induction, or both.
Inductive Coupling (Communication Circuits)
The association of two or more circuits with one another by means of inductance mutual to the circuits or the mutual inductance that associates the circuits.
Inductor
A number of turns of wire wrapped around a core used to provide inductance in a circuit. Also called a coil.
Input Power Factor
The ration at the input of active power (measured in watts or kilowatts) to input apparent power (measured in volt-amperes or kilovolt-amperes) at rated or specified voltage and load. See also: power factor, displacement; power factor, total.
Input Voltage Range
The range of input voltage over which the system can operate properly. (ANSI C84.1)
Inrush
The amount of current that a load or device draws when first energized.
Insulated Equipment Ground
An insulated equipment grounding conductor (EGC) runs in the same conduit or raceway as the supply conductors. This conductor is insulated from the metallic raceway and all ground points throughout its length. It originates at an insulated (isolated) grounding receptacle or equipment input terminal block and terminates at the point where neutral and ground are bonded at the power source.
Insulated Grounding Receptacle (IGR)
A receptacle in which the grounding terminal is purposely insulated from the receptacle mounting means, for the reduction of electrical noise (electromagnetic interference) on the grounding circuit. The receptacle grounding terminal shall be grounded by an insulated (isolated) EGC run with the circuit conductors.
Internal Lightning Protection System
All measures additional to those mentioned under external lightning protection system including the equipotential bonding, the compliance of the safety distance and the reduction of the electromagnetic effects of lightning current within the structure to be protected, including shielding and surge protection devices.
Interruption
The complete loss of voltage for a time period.
Isokeraunic Chart
A graphical representation (map) indicating the value (number) of thunderstorms measured daily (Td/yr.).
Isolated Bonding Network
(A) A bonding network that has a single-point connection (single-point ground) to either the CBN or another isolated bonding network.

(B) Typically a system-level grounding topology used by the original equipment to suspected or known site environmental issues such as power fault and surge, lightning, and grounding potential rise. The IBN requires the use of a single-point connection window (SPCW) (also known in the telephone industry as a ground window) to interface the rest of the building metallics (the CBN).