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Glossary - I-J-K
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Fire Protection Glossary - I-J-K


I - J - K


ICBO. International Conference of Building Officials, 5360 Workman Mill Road, Whittier, CA 90601.

Industrial Occupancy. Industrial occupancies include factories making products of all kinds and properties devoted to operations such as processing, assembling, mixing, packaging, finishing or decorating, and repairing. Industrial occupancies include dry cleaning plants; laundries; factories of all kinds; power plants; food processing plants; pumping stations; gas plants; refineries; hangars (for servicing/maintenance); sawmills; and telephone exchanges.

Initiating Device. A system component that originates transmission of a change of state condition, such as in a smoke detector, manual fire alarm box, or supervisory switch.

Initiating Device Circuit (IDC). A circuit to which automatic or manual initiating devices are connected where the signal received does not identify the individual device operated.

Intelligent System. A system using analog devices communicating with a control unit that individually monitors the value or status reported by the analog sensors and makes the normal, alarm, or trouble decisions.

Integrated System. A computer-based control system listed for use as a fire alarm system, in which certain components are common to nonfire monitoring and control functions.

Intermediate Fire Alarm or Fire Supervisory Control Unit. A control unit used to provide area fire alarm or area fire supervisory service that, where connected to the proprietary fire alarm system, becomes a part of that system.

Ionization Smoke Detection. The principle of using a small amount of radioactive material to ionize the air between two differentially charged electrodes to sense the presence of smoke particles. Smoke particles entering the ionization volume decrease the conductance of the air by reducing ion mobility. The reduced conductance signal is processed and used to convey an alarm condition when it meets preset criteria. Ionization smoke detection is more responsive to invisible particles (smaller than 1 micron in size) produced by most flaming fires. It is somewhat less responsive to the larger particles typical of most smoldering fire. Smoke detectors utilizing the ionization principle are usually of the spot type.
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Some information may be found within this web site that is reprinted with permission from one or more of the following: NFPA 70 National Electrical Code®,NFPA 72® National Fire Alarm Code®, & NFPA 101® Life Safety Code®, Copyright© NFPA, Quincy, MA 02269.

This reprinted material is not the complete and official position of the NFPA on the referenced subject, which is represented only by the standard in its entirety.