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Mine Type: All MInes Category:   Electrical
Mine Safety and Health Administration
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Safety Idea

Ground Fault Circuit Interrupters (GFCI)

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Many commercial and residential establishments use Ground Fault Circuit Interrupters (GFCI's) to prevent electrical shock. The way GFCI's work is by sensing when current traveling through the hot conductor is not returning via the neutral conductor. This prevents humans from conducting current to ground.

GFCI's can also assist in identification of faults if used in mine equipment control circuits. If a cable's insulation erodes due to vibration and the hot conductor contacts the frame of the enclosure, a properly installed GFCI outlet or circuit breaker can isolate the circuit in which the fault occurred and protect personnel from electrical shock.

GFCIs

GFCI outlets and circuit breakers like those pictured are relatively inexpensive and simple to install. Don't you think it's time you take advantage of the safety afforded by GFCI's?

Note: substitution of components that affect permissibility must be pre-approved by MSHA.


Reissued: 04/23/2004
Tag # AP2004-S095


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