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Intrinsically Safe Circuit [as applied to Hazardous (Classified) Locations]. A circuit in which any spark or thermal effect is incapable of causing ignition of a mixture of flammable or combustible material in air under prescribed test conditions.
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Related Code Sections

Article 504 Special Occupancies, Intrinsically Safe Systems
Safe Circuits. Intrinsically safe circuits in which the possible interconnections have not been evaluated and identified as intrinsically safe ...
(A) Special Occupancies, Terminals
Intrinsically safe circuits shall be identified at terminal and junction locations in a manner that is intended to prevent unintentional interference ...
22.34.1.4 Special Occupancy Requirements,
Intrinsically safe circuits, including sound-powered communications, shall be permitted to remain connected when either the handline or deluge system ...
22.34.1.4 Special Occupancy Requirements,
Intrinsically safe circuits, including sound-powered communications, shall be permitted to remain connected when either the handline or deluge system ...