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NOTE: This is an unformatted excerpt from our online fire protection training library.

Classification Basics

Electrical Equipment

Arcs and Sparks

Arcs and sparks are produced in the normal operation normal operation
Motors with brushes produce arcs routinely. Contacts of control devicess, contactors, relays, switches, and circuit breakers also normally produce arcs when the contacts are opened. of many types of electrical equipment. Arcs and sparks are also produced during some abnormal conditions such as during short circuits and ground faults short circuits and ground faults
Short circuits and ground faults will usually produce some arcing at the point of the fault, perhaps some additional arcing and sparking at raceway connections in the current path between a ground fault and the energy source, and an arc at the fuse or circuit breaker when it opens.. Special care must be taken in classified areas to eliminate or confine all arcing and sparking to prevent ignition of the gases, vapors, dusts, fibers, or flyings.
NOTE: This is an unformatted excerpt from our online fire protection training library.

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