ISM Band

The 2.4GHz frequency spectrum. ISM is actually synonymous with 2.4GHz, however it stands for Industrial, Scientific and Medical.

Inverter

A device that converts DC electricity into single or multiphase AC electricity.

Inverse Time Delay Relay

A dependent time delay relay having an operating time which is an inverse function of the electrical characteristic quantity.

Interruption

The loss of electric service to one or more customers or other facilities. It is the result of one or more component outages.